RAM compatibility, T440p and CAS latency

I read in a review of the 440p elsewhere that the user reported that the default shipping RAM in his device was DDR3 12800 CAS 11-11-11-28 at 1.35 volts.
There's a nice Black Friday deal on a 9-9-9-28 part and I wonder if there would be any compatibility issue by getting that.
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RAM compatibility

Hello, I installed in a notebook motherboard 3GB ram (Samsung M471B5773CHS-CH9, 10600-1333MHz) and want to know if it works inmpreuna with this motherboard 4GB ram (Samsung M471B5273ch0-CK0, 12800-1600MHz).
If compatible

ozlem123 wrote:
Hello, I installed in a notebook motherboard 3GB ram (Samsung M471B5773CHS-CH9, 10600-1333MHz) and want to know if it works inmpreuna with this motherboard 4GB ram (Samsung M471B5273ch0-CK0, 12800-1600MHz).
If compatible
Hi,
What is this motherboard ? To be able to answer, we need to know your machine, what is it ?
Regards.
BH
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U430 Ram Compatibility

I was hoping someone would tell me whether the following ram module is compatible with the IdeaPad U430 Touch, since I wasn't able to find any information about it.
http://www.microcenter.com/product/385183/8GB_DDR3-1600_(PC3-12800)_CL11_SO-DIMM_Laptop_Memory_Modul...
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Russianeer wrote:
I was hoping someone would tell me whether the following ram module is compatible with the IdeaPad U430 Touch, since I wasn't able to find any information about it.
http://www.microcenter.com/product/385183/8GB_DDR3-1600_(PC3-12800)_CL11_SO-DIMM_Laptop_Memory_Modul...
If you refer to page 74 (snapshot shown below) of the hardware maintenance manual, your unit needs a DDR3L 1600 memory module. Looking at the specs of the Crucial brand it looks like it is compatible and can be utilize. To be sure refer to the specs given by your processor manufacturer and see if DDR3L 1600 is really the proper memory module to be use.

Thinkpad T410 RAM Compatibility

Any one ever pair the 2 together?
Crucial CT25664BC1067
CT25664BC1067 - 2GB, 204-pin SODIMM , DDR3 PC3-8500 from Crucial.comUS
The reason I ask is because of this review on the page.
Quote:
Works, but IE8 started to hang more often after adding this module. Thinkpads are known to be picky on memory modules, so this tells me this is not the best.
I can pick it up for about $60 CAD and I'm about to check out, deciding on whether or not I should throw it in the cart.

I may have found a better option.
OCZ3M13334GK for $~95 CAD. Anyone try this one?
EDIT: Nevermind, misunderstood the site. Still thinking about the Crucial.

2GB RAM Compatibility

My hp pavilion dv6 3085tx W7-64bit laptop was equipped with 2+1GB Ram (ddr3 , 10600s & 1033),
Recently 2GB ram was stopped to work so i removed it. Now i purchased 2GB RAM(ddr3, 8500s & 1039) but I'm not sure whether it is compatible with my laptop. can i use it along with existing 1gb ram ?
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Memory Type: DDR3 PC3-10600, DDR3 PC3-8500, DDR3 (non-ECC)
Maximum Memory: 8GB
Slots: 2
Each memory slot can hold DDR3 PC3-10600, DDR3 PC3-8500 with a maximum of 4GB per slot.*
*Not to exceed manufacturer supported memory.
Although the memory can be installed one module at a time, the best performance comes from using matched pairs of modules.

CAS Latency of ram in 15- and 17-inch 2010

What is the CAS Latency (CL) of the ram in MacBook Pro 15- and 17-inch 2010 models?
I can't find any information about this anywhere.
Thanks!

Hello DCoin welcome to to the forums! To answer your question: CL=7
You can see some further spec's here:
http://eshop.macsales.com/item/Other%20World%20Computing/8566DDR3S8GP/
Hope this helps.

Mixing Ram with different CAS latencies in K7n2 Delta-L?

I have been using 512mb Kingston Value Ram in my computer, pc3200, with CAS latency of 3.0. I just purchased some Corsair value select 512mb ram pc3200 with CAS latency of 2.5. I know you are not supposed to mix ram with different speeds (like 400 vs. 333) but does it matter if the CAS latencies are different?
I'm running an AMD XP 1800+, K7n2 delta-L, nforce2 motherboard from MSI. Someone at a computer shop told me they tried mixing Kingston 3.0 CAS with Corsair 2.5 CAS, and said his computer wouldn't even post. So I'm wondering if this is an isolated problem, or you will always run into this problem if you mix ram with different CAS latencies.
If anyone has experience with this issue, please share with the board. Thanks!
Chris

The age old question, will the components I bought be compatible ? There are those that have bought identical matching memory that didn't work. In my case, I had an ECS K7S5A that used PC2100 Crucial memory, the sticks neither matched (at one time they did, but one stick died and they sent me the closest thing they had.). Neither of these Crucial sticks was identified by a configurator as being compatible with the K7N2 Delta L that I decided to buy. In the end, not only did both sticks work, but I put them in as single channel mode (ram slots 1 & 2), but later changed the configuration to dual channel mode (ram slots 1 & 3, even 2 & 3). It worked flawlessly in all three configurations. Sorry for the long answer, but in essence, there are no guarantees and your worries will drive you crazy. When memory is mixed, you reduce the likelihood of compatibility, even when you go beyond the recommended products that were specifically identified.
That guy at the computer shop, did he ever indicate or isolate the true reason why the memory wouldn't work ? Maybe, maybe not. I would think with a disparity in memory, the bios is the key to setting the settings for the worst stick of the bunch. Then again, the products you get might overclock to what the better sticks run at. My assumption is that mixed sticks, the bios retards settings to this in "auto" mode. When you force it manually, it may work or it may fail. One thing you oughta know, each and every stick has the manufacturers id encoded onto them at the very least, just like the firmware on other items indicates a manufacturer code and other data that allows these things to be compatible. So know you face that battle going in with any of them. If the bios programming doesn't allow it to work, from that perspective, there'll be problems.

CAS Latency of Default RAM

I have 1GB Apple DDR2 SO-DIMM 667Mhz 200 Pin RAM. I will upgrade to 4GB with CAS Latency 4. What is the current CAS latency of my current ram. Also, my ram is 2 x 512 MB and is by Apple (it came with my mac). I have White MacBook (Late 2007).
Thank You.

Just purchase any RAM that meets the specifications given in the computer's user manual. You need not be concerned about buying lower latency RAM as it isn't worth the extra money.

Adjusting RAM cas latency / timings?

Hello,
This is mostly a question of appeasing my insatiable tinkering instinct as I know that any tweaking will have little, if any, visible results in the real world.
Having said that...is there any way to tweak the cas latency/timing settings of RAM on my Mac? I know over on the Windows side of the world, this can be accomplished either in the BIOS or with third-party utilities so I was thinking maybe something in open firmware or the terminal or maybe a utility is out there somewhere and I just haven't looked in the right places.
Thanks,
Christian
G5 dual 1.8 GHz Mac OS X (10.4.8) 3.5 GB RAM, 2x DELL 2405, Radeon 9800 256MB, 2x250GB 7200.10

Hi Christian,
no, you cannot do that. The CAS latency is a hardware specification of the RAM chips you use. Here are 2 articles about that topic:
CAS latency
CAS Latency, What Is It?
If this answered your question please consider granting some stars: Why reward points?

DRAM Clock Settings and SDram Cas latency

: 8o Just got my KT3 ULTRA 2 Socket A Motherboard. When I turn on the computer, in the POST test it says:
DRAM Clock = 266MHz
SDRAM Cas Latency = 2
I checked the cmos and the latency is set at 2 , but what about the DRAM Clock? Please help for I am a newbie. Thanks

If your CPU is Athlon XP 2700+/2800+, the FSB is 166Mhz, the DRAM frequency is HCLK (166Mhz).
If your CPU is Athlon XP 2600+ and below, FSB = 133Mhz, then HCLK = 133Mhz, HCLK+33 = 166Mhz
If your CPU is older Athlon or Duron, FSB = 100Mhz, then HCLK = 100Mhz, HCLK+33 = 133Mhz, HCLK+66 = 166Mhz.

BUG with Memory CAS-Latency with MSI i848P Neo-LS BIOS

I have a bug with MSI i848P Neo-LS BIOS. I try many MSI i848P with same trouble : the CAS Latency is always set to 2.0 even if the memory is CAS Latency 2.5.
It doesn't depend on PSU or others things (graphics card,...).
Try with Pentium 4C 2.6 or 2.8
But I have just one brand of memory (but many different sticks). Chips reference are VT56DD32M8PC-5 (256 or 512 Mb). This memory are reference as Cas Latency 2.5
If I set memory timings on SPD or manual : same result !!!
If I set memory speed on AUTO or 400 MHz : same result !!!
If I set other timings, then they are save correctly (ie : RAS# precharge set to 3 or 4).
I check timings with latest version of Memtest86+ V1.0 : http://www.memtest.org/
and of course, I get many errors.
The same memory tested on others mobo, give good results.
I try Windows XP installation and I get.... blue screens.
With some memory sticks : I have this message "memory timing too tighly",
if I press F1 to continue: then I get a memory cas latency of 2.5 with memtest86+ and then no error.
I try BIOS revision 1.0 (default) and 1.2: same result !!!
So, as I said before, I think this is a bug with the BIOS. I agree that a BIOS cannot detect correctly all kind of memory, but if you set memory timings manualy, then it must be set as you want ! ?
Any idea...
Thanks

H0 Alex,
You are correct.I have the same problem with my 875p neo lsr on bios 1.9. TH0S 0S B0OS BUG.but everyone says your psu is not enough or your rams isnt on the MSI Memory Compatability List.
why all of rams I try give same result?
MS0 boards works only with 10 or 20 ram.you don't say customer why you use this rams?
why in asus boards many os these rams working properly.This rams isnt on the MSI Memory Compatability List.but working.I try many no name rams and results are very good in all of the tests.
In my opinion MS0 bioses doesnt work good enough.
You don't drive a car.Car Drives you.

Why DDR3 @ 1333MHz on Core I7 iMac + CAS Latency

Hello,
I've just ordered an iMac 27" Core i7 (mid-2010) with 4Go.
On Intel's i7 page, I read :
http://ark.intel.com/Product.aspx?id=37148&processor=i7-940&spec-codes=SLBCK
Memory Specifications
Max Memory Size (dependent on memory type) 24 GB
Memory Types DDR3-800/1066
# of Memory Channels 3
Max Memory Bandwidth 25.6 GB/s
Physical Address Extensions 36-bit
ECC Memory Supported No
On the other hand, Apple says that memory upgrades shall match the followings:
* PC3-10600
* Unbuffered
* No parity
* 204 pins
* *1 333 MHz*
* SDRAM DDR3
My questions are:
1° Why shall we use 1333MHz since i7 only supports 1066MHz ?
2° As regards CAS Latency, if I add 2x2Gb with faster CAS, will they work at their own CAS Latency or at the stock 2X2Gb's ?
3° If I decide to leave one slot free, I can simply add 1x4Gb. Will this impact the dual channel performance of the stock 2X2Gb or will this perform as before ?
Thanks a lot for your help !
Cheers,

Hi yoms
Welcome to Apple Support Communities
{quote:}1° Why shall we use 1333MHz since i7 only supports 1066MHz ?{quote}
Do yourself a big favor and stick to [Apple's Memory specification,|http://support.apple.com/kb/HT4255] those that have not, have had all sorts of problems ranging from slow performance, Kernel Panic's, failure to boot, damaged slots and fried memory controllers.
{quote:}2° As regards CAS Latency, if I add 2x2Gb with faster CAS, will they work at their own CAS Latency or at the stock 2X2Gb's ?{quote}
When [Installing or replacing memory|http://support.apple.com/kb/HT3918] you can have 2 or 4GB modules in opposing banks, but they all must be the same latency and speed.
{quote:}3° If I decide to leave one slot free, I can simply add 1x4Gb. Will this impact the dual channel performance of the stock 2X2Gb or will this perform as before ?{quote}
More ram will help, but [Matched RAM on Intel Macs|http://guides.macrumors.com/MatchedRAM_on_IntelMacs] always provides the best performance.
Two highly recommended third party ram suppliers are [OWC|http://eshop.macsales.com/shop/memory/iMac/2010/DDR321.527] and [Crucial|http://www.crucial.com/store/listparts.aspx?model=iMac%203.6GHz%20Inte l%20Core%20i5%20%2827-inch%20-%20DDR3%29%20Mid%202010&pl=Apple&cat=RAM]
Dennis

Check memory cas latency ?

I have a 15" i5 MBP from 2010 (MacBookPro6,2) with 4 gb of 1066 mhz ram at cl 7. I want to upgrade to 8 gb, but the local computer stores here only carry 2x4gb of 1333 mhz ram at cl 9. My calculations show this new memory should be able to run at 1066 mhz with cl 7. I've installed it in my MBP and it's running fine, but is there a way to tell if the MBP is running the new ram at cl 9 or cl 7 ?

I've never seen these questions asked here before, and I think therefore it's safe to say that very few Mac users ever give a moment's thought to the stats you're asking about. As a general rule, if it works, we use it. If it doesn't, we exchange it for something that does.
Most if not all Macs will slow faster-than-spec RAM down to the speed of the specified modules. Your machine is undoubtedly running your RAM at 1066MHz. As for cas latency, who knows? Apple's specs say nothing about that, and never have.
You will usually save a lot of money by buying RAM online rather than from a local store, and you'll usually be able to find the RAM that is specified for your machine.

KTV4 DDR266 memory CAS latency compatability - question

I am planning to upgrade my DDR266 RAM from 512MB to 1GB by adding a 512MB module.
The current module is CL2, but all available upgrades are CL2.5. Supliers all recommend CL2.5 modules. Will I have a problem if I mix CL2 with CL2.5? I have ask a couple of memory suppliers about the CL compatability, but they will not express an opinion.
If there is an issue, I was wondering if setting CAS# Latency in BIOS to CL2.5 will help.

Hello,
You should never mix memory modules that are different.
Yes it can work fine but for optimum performance you must match.
Sometimes both modules will not work together
PC will BSOD a lot
Or it will be ok.
Yes setting the memory timing to CL=2.5 in the BIOS will make the other memory module run at CL=2.5 but there are more timings that just the CAS latency.
All must be the same/old module must be capable of running at new modules timings.
Will the new module be DDR266?
I would recommend you get some new sticks, PC3200 (<will run at 266DDR) 2x512MB and sell the old one.

CAS Latency 2 Reverts To 2.5

My RAM is designed for 2.5-3-3-7. I've already changed it to 2.5-3-3-7, but was recommended by someone else with similar memory that I try changing the 2.5 to 2, for more performance. When I set it to 2 it boots and runs fine, but CPU-Z and Memtest86 report it as 2.5 still. The BIOS definitely reports it as 2.
Why?
Is it true that the CAS Latency makes little difference on my system? Why is this?
Specs:
Intel Pentium 4 2.8e HTT @ 3.26GHz
Thermaltake Spark 7+ Xaser Edition A1715 CPU Cooler
MSI 865PE Neo2-PFISR motherboard (BIOS ver. 3.8)
2x512MB OCZ PC3700 Gold Edition Revision 3 Dual Channel Enhanced Latency DDR @ 466MHz
Built-by-ATI Radeon 9800 Pro @ XT 128MB DDR 256-bit @ 415/744 (Catalyst 4.12)
Arctic Cooling VGA Silencer Revision 3
Creative SoundBlaster Audigy2 ZS Platinum
Cyber Acoustics CA-4100 4.1 Surround
Maxtor 6Y120M0 120GB HDD 7200RPM SATA150 8MB cache
Sony DDU1612 40x/16x DVD-ROM
Sony CRX230ED 52x/32x CD-RW
Enermax Noisetaker EG475P 470W PSU(+3.3V = 34A, +5V = 40A, +12V = 33A)
Ultra Dragon ATX Mid-Tower Case
Windows XP Pro SP2

Sounds like CPU-Z is reading the IC Chip settings and not BIOS settings.

RAM compatibil​ity, T440p and CAS latency

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RAM compatibility, T440p and CAS latency