Upgraded Mini: Link speed = 130Mbps, Transmit rate = 65Mbps

It was a long night last night. I finally upgraded my old Mini (Late 2006) with a compatible Atheros AR9280 wifi card. It's already been upgraded years ago to 2GHz C2D, SSD, 2GB RAM - running Snow Leopard 10.6.8. So wireless-N is really the last thing to do here.
Installed easy enough. Recognized and connected to my AEBS (2nd gen.) - but only at 65Mbps transmit rate. No matter what - apparently. Network Utility reports Link Speed at 130Mbps possible.
My network:
AEBS (2nd gen): 2.4GHz N-only, WPA2, Can't go to 5GHz - my tablets/phones not compatible, and AEBS (2nd gen) is not dual-band.
LAN-connected: Mac Mini Server (2010), Windows 8 laptop, and my NAS.
WLAN: Windows 7 laptop, above Windows 8 laptop occasionally, 2 pads, 2 phones, and the old Mini in question.
All of the above achieve transmit rates at 117-130Mbps depending on where I'm positioned (except the weaker phones and pads).
Here's what I tried and discovered last night:
[thinking it's interference/distance/signal problem]
1. Positioned the mini 6 inches from AEBS - increased signal to -22, but still 65Mbps.
[thinking it's single vs multiple data stream problem, so then...]
2. Connected the bluetooth antenna as secondary antenna on the card - increased signal, but still 65Mbps.
[thinking it's antenna problems, so then...]
3. Used 2 antennas from parted laptop. No change.
[thinking it's a problem with the wifi card, so then...]
4. Installed the card in an old Windows 7 laptop, installed drivers - Transmits at 130Mbps!!!
[thinking it's a router issue with Macs only, so then...]
5. Turned on wifi at the newer Mac Mini Server (2010) - Also transmits at 130Mbps!!!
[thinking it's Mac OS "registering" my card capabilities as the old 54g card somehow, so then...]
6. Installed fresh 10.6.8. No change.
[thinking it's driver compatibility issue with "IO80211family.kext" version 3.2 (in 10.6.8), so...]
7. Tried the Lion and Mountain Lion versions of kext above (edited as they don't natively see the AR9280) - Not compatible - No card found.
[thinking that a beer would be really good to clear my head, so...]
8. Beer, followed by sleep.
So the card is fine, antennas are fine, router setup is fine (at least for all other machines). It must be one of two things:
A: MacMini (Late 2006) hardware limitation of some kind - Although I have seen others with this upgrade online.
B: Driver/kext issue.
Anybody brave enough to take a stab at this?
Respect -

Thanks for the effort guys -
Tried these two suggestions at the same time, by disconnecting all wireless devices, and setting the AEBS to 11n 5GHz only, and rebooting AEBS and the Mini. Auto channel is the only option in 5GHz - and it chooses channel 100.
Same story: 65Mbps
I'm onto another theory now - The card is not an Apple branded Atheros card, although System Profiler accepts that it is (see above screencaps). It has the same chip, but not the same branding. Note the "Card type" is reported Airport Extreme (0x168c, 0x1c71). In other reports I have seen the second half should be 0x8f for the AR9280 card.
What also bothers me is that "Locale" is "Unknown". On the original 54g card it was "FCC". Perhaps this prevents the card from using its full capabilities?
But the main issue I can't get my head around is that in other failed upgrade efforts I have seen while searching - their card is just not recognized or unsupported, etc. My card works - but not full speed.

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Transmit rate vs. Download speed: should I switch everything to 5GHZ or does it matter?

Thanks in advance for any help that you can give me. I am not well-schooled in networking so, after doing a lot of research and not being able to get clarity, I figured I would write what I understand and hope that somebody here could point me in the right direction. I have 3 airport stations (a time capsule dual band is the primary and 2 airport expresses) and they are all ethernet wired. All my devices are 802.11n capable and all the base stations are n capable. I have no strictly b/g devices, only n devices. No matter what base station a device is connected to, the speedtest.net rate is about 17mbps (I pay for 18mbps) so that is good. However, the "transmit rate" (and I don't really understand what this does) varies depending on what base station my device hooks into. Whenever I am near the time capsule (primary station), my devices hook in at 5Ghz and I get a transmit rate of about 240 to 300 and a 17mbps download speed. But when I hook into either of the other 2 aiport expresses, it shows that I am hooked into 2.4Ghz and the transmit rate is about 50 to 130, but I still get the 17mbps download speed. I know I can change both expresses to only do 5Ghz. Keep in mind, the speedtest.net test always shows about 17mbps download speed no matter what base station my device connects to. I am not sure I understand what the transmit rate indicates. I want to make my network the fastest it can be no matter what base station I use.
So, my question is should I change the other 2 airport extreme base stations to operate as 5Ghz n network only so that I have 5Ghz operating throughout my whole house which will give a higher "transmit rate" and will that make my experience faster even though I already get maximum 17mbps download speed? Also, if you could, please explain to me the difference between ISP download speed and "transmit rate" because I don't really understand the difference...I mean how does download speed affect my experience vs. how does transmit rate affect my experience? Do I really need to have a higher "transmit rate" to increase my speed or is just having 17mbps download speed necessary and the transmit rate doesn't matter?
One other thing you might need to know: I don't have any 2.4 ghz devices that might interfere with my network (my cordless phones are 1.9Ghz)
Thanks again for the help.

Think of it like this.. Change moving data in air to water in pipes.
You have a 1/2" pipe coming from the ISP into your house..
Inside your house you have 5" and 2" pipes.. (this represents the speeds or flow rate if you like, 1/2" is all the ISP gives you.. but your ethernet is a huge pipe.. think of it as infinite for this situation,, and 5" pipe that is 5ghz and 2" pipe is 2.4ghz.. this is just illustration remember it is area not diameter that matters).
If you transfer files between the computer on the TC to the TC hard disk.. you get all the 5" pipe.. very fast.
If you copy a file between computer on the TC and device on the express.. you are limited by the 2" pipe.. everything goes at the speed the 2" pipe can manage.
Now you do something with internet.. 5" pipe can get the same throughput as the 2" pipe because it is only 1/2"
Pipes btw are still in imperial even if you are in a metric country pretty often.
But I hope that illustrates the situation..
If a computer on 5" pipe and computer on 2" pipe are both trying to access internet .. they both still have to share the 1/2" pipe. In a perfect world they both get half your 18mbps if they are accessing it at the same time.. (QoS represent a flow valve that says this pipe should get more flow even if it is smaller so I shut the valve down on 5" to make sure it only gets what the 2" can get.. no more.. to be fair.).
Same as water in pipes.. the 1/2" pipe can never fill the 5" or even the 2" pipe.. the 2" cannot fill the 5" so the fastest would be everything on 5" pipes.. since you are unlikely to be able to afford a 5" pipe from the ISP then you accept everything is going to go slower when internet is involved.
Jumping out of my illustration..
Apple made 2.4ghz max out at 150mbps..
Although some of the later stuff can get better than that,, 217mbps.
The 5ghz is faster because it is has more bandwidth.. up to 1200mbps in the newest AC .. 450 on Gen3,4 TC and 300 on the older gen1,2
BUT the range is poor.. so generally better sticking with 2.4ghz for express.. they are not high power devices at all.
2.4ghz has better range and penetration.. you are going to be just fine with internet access.. and your setup is actually working really well.. There are some overheads on wireless so you do not quite hit wired speeds.

"Negotiated Link Speed" question to make informed decision on upgrading my hard drive

This is my first post on any help forum I've made in a while as I have usually found answers if I looked hard enough. I am glad I caught and investigated this detail before buying anything that may not improve. What I really want to do is top my macbook out. I'll try to provide as much useful info I can and appreciate what clear insight anyone has for me.
While comparing the specs of my current hard-drive to the SSD ones, I couldn't help but notice these line items:
Link Speed:    3 Gigabit
Negotiated Link Speed:    1.5 Gigabit
While I spent a great deal of time researching similar concerns I could not find the answers that I needed, or made any sense. I'm going to include the hardware specs of my system to make this easier for anyone who is more knowledgeable about what is causing the 1.5 limit. My current stock hard drive is a Seagate Momentus 5400.6 SATA.
Serial-ATA:
NVidia MCP79 AHCI:
Vendor:    NVidia
Product:    MCP79 AHCI
* Link Speed:    3 Gigabit
* Negotiated Link Speed:    1.5 Gigabit
Description:    AHCI Version 1.20 Supported
Hardware Overview:
Model Name:    MacBook Pro
Model Identifier:    MacBookPro5,4
Processor Name:    Intel Core 2 Duo
Processor Speed:    2.53 GHz
Number of Processors:    1
Total Number of Cores:    2
L2 Cache:    3 MB
Memory:    8 GB
Bus Speed:    1.07 GHz
Boot ROM Version:    MBP53.00AC.B03
SMC Version (system):    1.49f2
All I am looking to do is top out my system hardware wise. I already maxed the RAM and was interested in getting an SSD. Before I do....I need to know why the 'negotiated link speed' is not reading 3gb as well, and if it's something I can correct. If I upgrade to a 6gb SSL and the value still reads 1.5 I'll have wasted my money. Thanks all.

I looked in as many sources as I could find, and didn't see any 'published' link speed for my macbook. I am led to believe that it is 3gb based on the system report. Since my 5400rpm drive cannot physically achieve much less than 1gbs, if what your saying is true (which is sounds to me that you know what you're talking about).
With this understanding, even if a 7200rpm drive can't saturated the 1.5gb, and even if my Macbook data *may* not be able to exceed 3, would it be logical to say that an SSD would gives me 3x the speed if I upgrade? I'm just looking to get the most out of my computer with the current processor and the 8gb of RAM. If it makes the music software, opening/closing programs, reboot, start-up, shutdown and things like that more noticeably 'snappier'. I can be comfortable with the investment.
"The bottleneck is the drive's best-case transfer rate."
I would like to know how to go about determining this. I also need to know if I have to limit my choices to an SSD based on the recommended upgrades for my specific computer:
http://eshop.macsales.com/MyOWC/Upgrades.cfm?&model=353&type=Internal+Drive&sort =pop
or if I can get a discounted one such as this:
http://www.microcenter.com/single_product_results.phtml?product_id=0364781
Speed and compatibility. Before I upgraded to this macbook from my PC, I was chasing incompatibility issues all over the place and got to spend less than 10% of my time actually working on music/video production. If only I had know then what I know now….but that's why I gotta do my homework before buying everything these days

Transmit Rate on my Mac Pro and MBP

Hi,
I have a early 09 MBP and an early 08 Mac Pro. I recently upgraded both from SL to ML. Both are running on the same wireless network, set up with anAirport express. I am experiencing really erratic wifi signals on my Mac Pro (it'll drop out w/i a few min. of connecting to a wifi), though my mbp stays on the network just fine.
I opened up system profiler and wrote down the following numbers
                         MBP                              Pro
Signal/ noise      -66 dBm / -86 dBm          -84 dBm / -85 dBm
Transmit rate     117                                   26
MCS Index          14                                   9
What does these number mean? do I need a new airport card for my pro?
Thanks
Angela

If you download and use OmniDiskSweeper, It will tell you what is using the disk space.
Allan

Fluctuating Transmit Rate

I have been using my Airport Extreme for a few months now, and apart from having that annoying hissing sound that seems to be benign, all has been well. However, a few days ago I found that I was having problems streaming Netflix to my Apple TV and my iPad2, both using the 5GHz wifi. I spoke to Netflix and they noted that at certain points my internet was dropping to 1.5 mbps. I have a steady 15mbps connection and it's healthy whenever I run speed tests and my ISP reported no issues. So I opened the Airport Extreme utiity and I noticed that when I stream Netflix, my transmit rate always fluctuates (anywhere from 65 down to single digits). The really strange thing is, this only happens in the evening. My iPad and Apple TV have no issues in the morning. I've decided to wire my Apple TV since I use that a lot, but why would this suddenly start happening?
Is it possible my router is faulty? Wouldn't it just not work if that was the case? Or is it more like my neighbor got a new router and his or her signal is messing with mine.

Yeah, I've tried all that. This morning, the signal seems stable. It could be that when there are more people around, the signal weakens. Netflix streams perfectly over wifi on both my iPad and AppleTV. Since that's the case, I have to assume that it's something that is outside of my control.
The AEBS is pretty much in the exact middle of the house, where it has been since I bought it and where all previous routers have been.
It's been cold and dry here lately (-30 C/ -22 F) so it may have to do with more people using electricity to heat. That's really the only thing I can think of that has changed.

Mac OS X 10.7 Lion and Transmit Rate

Since I upgraded to Lion the transmit rate has dropped from being reported at 450 in Snow Leopard to 216 sometimes 349 in Lion. Nothing has changed hardware-wise apart from upgrading to Lion only.

Tried unsuccesfully to remove my previous post.
This the correct EDITED version:
This is an older post, but…
A visit to the original applejack at sourceforge.net yesterday, and drilling down through its links, does not specifically that there is no current version for Lion 10.7.x.
http://sourceforge.net/projects/applejack/?source=directory
I know that it's not uncommon for an author of freeware not to keep the site updated, however.
Does anyone have definitive information on this?
~~~~~~~~
EDITED to remove a reference to some misinformation I had received.
Sorry.

Wi-fi transmit rate

Hi,
I have Time Capsule 2TB (2011) and two MacBook Pro - 1st 15'' early 2008 and 2nd 13'' late 2009. Both of them are connected to the Time Capsule and the 13'' MBPro hase the transmit rate about 270-300 and the 15'' just 130. How can I get higher transmit rate on the 15'' MBPro?
Both MacBooks have OS X Lion (latest update) and the Time capsule also the latest firmware...

jakudo wrote:
I've tried that and the 15'' older MBP still showed just 130, where the 13'' showed 300
The 13'' MBP shows Chanel: (DTS 5GHz). What is the "DTS". The 15'' MBP doesn't show "DTS". Could this be the problem why it has lower Transmit rate?
Are you using the same wireless name on both 5ghz and 2.4ghz?? I recommend you change them.
If you still have issues change the security to off, just to test. I don't think any N wireless card in the Mac that works at 5ghz will work at less than 300mbit.. but of course with 5ghz you need to be close to the TC.. how close are you??
Open a terminal and type airport -I
It will show you the current setup of the wireless. Here is mine.
revs-hs-mac-pro:~ Revs$ airport -I
     agrCtlRSSI: -50
     agrExtRSSI: 0
    agrCtlNoise: -85
    agrExtNoise: 0
          state: running
        op mode: station
     lastTxRate: 54
        maxRate: 54
lastAssocStatus: 0
    802.11 auth: open
      link auth: wpa2-psk
          BSSID: 0:26:44:a7:4e:bf
           SSID: TG782T
            MCS: -1
        channel: 1
DTS stands for Data Teminal Send.. it is a term used in settings of modems and wireless.
I have no idea why it is popping up though unless you need the ssid DTS..

Very low Transmit Rates

I am experiencing very low transmit rates when using the 5GHz band. It goes down to Transmit rates of 56, and when i use the 2.4 n only it's still low at 90-117, I think it's really effecting my download speeds on the Apple TV when we're renting HD movies. It says it'll take and hour to be ready to play. Do you think that our Time Capsule is faulty?

On 2.4 GHz band, the link-speed (transmit rate) you are getting is average.
However, when you downloading a rental movie, the bottleneck is your broadband connection.
Have seen Apple's published figures on buffering time before you can start watching an HD movie?
http://www.apple.com/appletv/specs.html#movierentals
Most people have a broadband speed between 2Mbps - 768kpbs, so the wait time is somewhere between 2 - 8 hours.
IMO, your TC is working correctly, there is nothing to worry about.

Ethernet transmit rate

Is there a way to find an Ethernet Transmit Rate? I'm running a Mid 2010 Macbook Pro. For example, to find the wifi transmit rate, I know I can hold down OPTION and click on the wifi icon in the menu bar and view various wifi specs in the pane that drops down. I also know how to look up LINK SPEED via Network Utility > info > ethernet/wifi, etc....
Is there even such a thing as an ethernet transmit rate, or am I creating my own vocabulary? Sorry if this is a dumb question...

You have to focus on what you want to accomplish.
You want to know how fast your ethernet Link could be, if every bit were data? Use network utility.
You want to know how fast your connection to the Internet is? use speed test.
You want to know how much data you are sending now? Use Activty Monitor | Network pane

Reduced transmit rate on new dual band AEBS vs older AEBS 802.11N, gigabit

Hi,
I recently upgrade my AEBS from the older 802.11N Gigabit version to the dual band version. The new 2.4ghz part works fine for my iphone, however the 5ghz signal has much slower throughput. previously I could routinely get 270Mbps, now I am lucky to get 160Mbps. the new 5ghz signal is on the same frequency (48), the same multicast rate, and has wide channels selected. When I plugged the older model back in and tested it the throughput was the same 270Mbps so it is not some new interference.
Anybody else see anything like this? Do the two radios on the AEBS interfere with each other somewhat?
any ideas? Did I just get a dud unit or is this common (fixable?)?
Thanks

Hi Bob,
Thanks for your reply. My situation is a bit different as I have various wifi units from different locations (some US, some European, some Japanese, etc, etc). As such I need to pick a frequency that works for everything, and on my previous non dual band AEBS channel 48 worked fine. I have tried channel 161 just for curriosity and it made no difference. The transmit rate is listed at between 216Mbps and 27Mpbs but as soon as you attempt to transfer anything it drops significantly. I have also tried to time the difference between my new dual band AEBS and the older one and, regardless of what the connection speed is saying, the new one is definitely slower.
It isn't unusable by any means, I just thought it was odd and I have never seen it mentioned on any of the reviews of the new dual band units.

802.11n Can't get 270mbps link speed on Macbook

Hi,
I have a Netgear DGN2000 802.11b/g/n Modem/Router and I have tried, and failed, to get my Macbook to sync at 270mbps. I have set the router to this speed in the setup page, but the network utility has me consistently connected at 130mbps. Is there something I need to enable? Or could the problem lie with the router. I have no other draft n spec machine to test on. Is there anyway other than network utility to see what the router is outputting?
Thank in advance

a brody wrote:
130 mbps is still faster than 802.11g. I suspect the problem is with your router's implementation of 802.11n. It is still a draft standard. Also if your connection is in any way open, it will slow down with each additional machine on the network. Check your router's firmware, and check what happens if only one machine is on the wireless network.
Network Utility reports 130 mbit/sec, and that's just the theoretical limit. I don't believe that's necessarily any measure rate. I think what some people are upset is that it doesn't *report* the full 300 mbit/sec for "link speed" like you see on the 802.11n enabler page:
http://store.apple.com/Catalog/US/Images/d4141airportenablerLM.png
In any case, there's no way that it would be able to stress out a residential internet connection, although some people probably do home networking (I don't).

I have an ipad 2 and when connected to my wifi at home it will not download and play you tube videos quickly. Do I need to upgrade my connenction speed? What is the optimal speed?

I have an ipad2. When connected to my wifi at home it will not download you tube videos for easy viewing. Do I need to upgrade my connection speed? Would 3 Mbps be enought or do I need to go to 6 Mbps. I mainly use my ipad to view emails, browse the internet and watch you tube videos.
thanks - Michelle

Welcome to Apple Support Communities.
There are a number of factors in the 'speed' equation. Any or all of them can affect the 'observed' speed of your connection.
1. Are you in a neighborhood full of WiFi routers (and thus, lots of WiFi interference)? I can 'see' at least 22 other WiFi routers from my living room!
2. What is the maximum connect speed and band and bandwidth available from your wireless router. Is it 802.11n or the older 802.11a/b/g? 300Mbits or 150Mbits? 2.4Ghz or 5Ghz or both? Does your router measure (QoS) Quality of Service and can it change 'channels' automatically?
3. What is the observed strength of your wireless connection? Are you getting at least 80% signal when connected? Are there other people in your family also using significant bandwidth at the same time (Netflix, streaming video, streaming audio, game systems)
4. What is the "advertised" speed of your current ISP connection?
5. What is the measured throughput of your current setup. Go to speedtest.net or use the free speedtest.net app available in the App Store. Try several times, from different locations in your home, and at different times of day and night.
I have AT&T DSL advertised at 3Mbit/sec down and 512Kbit/sec up. My Speedtest.net measured throughput is about 2.4 Mbit/sec downstream and upstream is about 0.4Mbit/sec. I'm using a Motorola Netopia 2210-2 DSL modem. I have no problem viewing YouTube videos and other mobile video content on the iPad 2. I'm connected wirelessly to a D-Link DIR-655 Gigabit router rated at 150Mbps at 2.4Ghz (only) with 802.11 b/g/n enabled. The interior of my home is within a range of 30-50 feet from the router and no more than 1 wall. It is a single level concrete slab foundation of about 1500 sq. ft. with cathedral ceilings. I have successfully streamed ESPN3.com on my MacBook at the same time my son was streaming another ESPN3.com game on his MacBook Pro. I've streamed YouTube videos while my son was watching a NetFlix movie on his Wii game system. He's also successfully used Skype for extended 'teleconferences.' None of my devices are connected to HDMI on a large screen TV. 95% of the time, I can do iChat video without any signal breakup to my son (who is at a college with a Gigabit (1000Mbit) wired connection!). 5% of the time the connection drops. We haven't tried FaceTime (designed for mobile connections to be much less bandwidth-intensive, from what I understand) simply because we both have iChat on our computers.
So for me, a 3Mbit DSL connection is absolutely adequate, given all the other parameters mentioned. As the car manufacturers say, "Your mileage may vary."
Message was edited by: kostby

Right, MacBook Pro 17" early 2011(Built March) and my new OCZ sata III 6G not working, when is Apple going to admit there is a problem with the Intel's 6 Series Chipset. In System Information it says "Link Speed: 6 Gigabit" which is sata III.

My MacBook Pro 17" early 2011(built March) and my new OCZ sata III 6G are not working together, when is Apple going to admit there is a problem with the Intel's 6 Series Chipset. In System Information it says "Link Speed: 6 Gigabit" which is sata III and in my MacBook Pro it does not work.
Now MacBook Pro 17" early 2011 built May onward do not have this problem it was fixed in the Intel's 6 Series Chipset. (So there is a problem). Cam I have my MacBook Pro fixed please.

After biting the bullet and ordering more RAM, my computer now is working a ton better. So that must have been the main issue. With 8 GB RAM, I can now even run Parallels fluidly (better than my work PC!) where before simple things like logging in to my MBP after reboot could take forever.
The place I went to had several other people getting RAM upgrades at the same time as me, so between this and other comments I've seen in discussions here and elsewhere on the Internets, I take it to mean that either Apple should bump up the base RAM on its new machines, and/or stop charging so much for additional RAM.
I refused to believe a Pro machine bought with Lion installed would come with too little RAM for light to medium usage, but it was apparently the case. I'll mark this as a correct answer and hope some other poor soul will come across this thread and be helped by it.

Widely fluctuating Transmit Rate readings with AEX?

Here's the set-up for starters:
Roadrunner wi-fi router/modem at 2.4 GHz channel 11 (can't turn this off, no admin access)
New Time Capsule at 2.4GHz channel 6 and 5GHz channel 149.
New Airport Express set to extend the wireless, at 5GHz also channel 149.
Here is a link to a screen capture of my iStumble capture of the situation:
http://www.spinland.biz/images/istumble_screen.jpg
The DDW is the Roadrunner modem. The best-signal "mythreecats' is the AEX, the other two are the TC. The NETGEAR is my next-door neighbor (this is a semi-rural area, houses not very close together).
The TC is two rooms away on the same floor, the AEX is right next to me as I sit here--I can reach over and touch it from my chair.
When I alt-click the airport icon sometimes I get well over 200 on the Transmit Rate (once saw 300), but often as not it comes in below 100. Right now it's only 81. As you can see from the iStumble shot I'm getting only 52% signal strength, even though it's literally an arm's length away.
Is this normal behavior? Should I be thinking my wi-fi receiver in this MacBook Pro is having issues? I just checked my wife's MacBook (2 months old) and it's getting a Transmit Rate of 270 in the same room. Does the aluminum case of the MBP reduce signal strength?
Thanks in advance.

Okay, another data point: I just re-checked via my wife's MacBook and this time her Transmit Rate is showing only 81 and iStumble from her machine is showing the signal strength to the AEX at 47%. It's only halfway across the room from the AEX.

Anyone get a 300 Mbit link speed using 40 MHz (Channel-Bonding) on 802.11n?

I recently switched from a MacBook Pro 2.33 C2D 15 to a new MacBook Air 1.86 SSD... For some reason, one little persistent mystery that remains, is that I have been unable to get the Air to establish the link speed at 300 Mbit/s at 40 Mhz (Channel-Bonded). The best I can get is 270 Mbit/s, although my MacBook Pro consistently links at maximum. Signal quality is not an issue...
Anyone have an idea why? Can an Air owner out there confirm max link, or is this little gem incapable of 802.11n wide 300 Mbit/s?
Thanks to anyone who can shed light on this little puzzle...

Thanks for the reply.
First, you need your TC's 'Radio Mode' set to '802.11n only (5 Ghz)' - (I assume you do, since I don't think the 'Use wide channels' option should appear in any other mode...).
Now, the quick method to check Link Speed is in the 'Network Utility' Info tab...
Note that I don't have a major issue with my transfer rates, but do think it's an anomaly for a MacBook Pro to consistently link at 300 Mbit/s and my Air to refuse the same (max 270). In general, I would say that my Air exhibits (a bit) less sensitivity than the Pro with consistent wireless performance (i.e., I never had issues with the Pro acquiring and maintaining wireless links - the Air less so...).
Thanks for your help.

Upgraded Mini: Link speed = 130Mbps, Transmit rate = 65Mbps

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