New ram, install in upper or lower slot? Any difference

Hi
I have just purchased a 1GB of ram.
I already have a 512MB which is installed on the lower slot. I have installed the 1GB on the upper slot and it works, just because it was easier.
I was wondering if it makes a difference for performances if the biggest chipis set up in the lower or upper slot.
Many thanks

Hi, lune. No, it doesn't.

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now have 2 GB chips in all 4 slots - total 8 GB. Imac mid 2011 I5 core
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Recently put in a new hard drive after the last one failed. The new RAM, equaling 3GB, was installed on my iMac C2D 24" BEFORE the failure. I got it back from the shop today and checked to see if the RAM was still recognised. The System Profiler is showing 1GB or RAM, 512 in each slot, and the serial numbers match the RAM that came with the computer originally.
I'm running Snow Leopard and haven't noticed anything running slow. Is this just a glitch in the matrix?

So you are saying the original DIMMs are there plus the ones you added, all were recognized before the repair but only the Apple-supplied after the repair.
Just trying to keep all of this straight in my mind.
In that case, you might try removing the DIMMs you installed and reinstalling, one at a time and see if they are recognized. If they are not, then they may have gone bad for some reason, who knows why, and it is time to look at the warranty you have from the people from whom you purchased the DIMMs.
If it was someone like Crucial or OWC (macsales) they are really good about their lifetime warranty.
If the warranty is lifetime, contact the supplier and see what the process is for replacement.
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Mac Pro not starting after new RAM install.

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I have a Mac Pro Mid 2010 2x2.66 GHz 6-core (12core) Mac Pro with OSX 10.7.5. I currently have 6gb 1333 MHz DDR3 ECC ram installed.
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I popped it in yesterday and when I try to start up, the LED light just flashes and the screen acts as if nothing the computer hasn't been turned on. It does not beep or make any startup sounds either.
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What you have not done is actually... what I would have done first to start with!
To make sure it works and works alone.
Mixing is suppose to work now, better, but as OWC found earlier, mix and match requires DIMMs that will.
There is more in depth on MacRumors about ranking, Registered and much more about using 3rd party and what to look for and does or does not work. Which is nice, they try and tend to keep everything in one place, one thread, easy to find and read.
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Hey there,
I was just given a Power Mac G5, QuickSilver. It looked relatively clean inside, and had all the neccessary components already installed except for the RAM. I went ahead and bought 3 PC133 SDRAM modules, but when I put them in, I hear one loud beep and it appears nothing is happening. I can hear the fans blowing inside, but I don't get anything displayed.
I know this one beep means the computer doesn't see the RAM, but could my battery be dead? Would that also cause the sound?
Anyone have any other tips or tricks?
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Hi-
Apparently it was one of the launch models for the Quicksilver, or at least that's what I'm told.
That'll be this one:
http://www.everymac.com/systems/apple/powermacg4/stats/powermac_g4_733qs.html
do you know if there are limitations to how high I can go with hard drives?
That model/series (QS 2001) only supports up to 137 GB drives (128GB formatted).
You can use a 160GB drive with no worries regarding the "unused" portion.
I was kind of wondering if I could purchase a Serial ATA PCI controller card that would allow me to use SATA hard drives.
Of course you can.
This will also get rid of the capacity limit.
However, if you want to boot to the connected drives, not all support boot.
The best, hands down, controller that also supports boot is the Firmtek Seritek line.
The 1S2 is as cheap as they come:
http://eshop.macsales.com/item/Firmtek/FTST1S2/
I was also given an AGP G4 (400MHz) that was missing the hard drives, RAM, and battery.
All those parts are basically the same for the QS and the Sawtooth (AGP G4).
You can try a stick of your new RAM and any ATA hard drive (up to the same limits as the 733 QS) and see if you can get it going.
Order a new PRAM battery (or 2) from OWC while your at it.
Always nice to have a fresh one.
BTW, ALL QS processors are interchangeable.
That is to say, if you find a deal on any other QS processor (and heatsink), even a dual processor, it is a straight swap.
Look around my website, as there is a bunch of information that you might find interesting:
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Hi,
I just clicked a new 1GB RAM chip into my old iBook G4, but it doesn't seem to be recognized.
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New ram installed and now have black screen then it shutsdown

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Hi
Seems to be an issue with the Memory slot which need to replaced. In case if you unit is still cover by the warranty i would request you to call HP Technical support and get the System Board replaced.
Let us know how it goes!
"I work for HP."
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NEW RAM INSTALL PROBLEMS

hi guys, ive a new 2010 mac pro 5,1 8 core [2x 2.4 ghz ] 12gb
My ram is as follows, 2 x 4gb modules +4 x 1 gb modules [DDR3 ECC 1066mghz]
and all slots are full.
TodayI just purchased two 8gb modules, and now no matter what order of slots i put them in, I can only register the 2 x 8gb chips 16gb of memmory that I juts put in, even if the other slots have 4gb ram modules in them, they dont show up in sysytem, prefs[thats after many flashing power light issues and changing slots] they show up as empty dimm slots in system prefes???
have I exceeded my maximum ram with this machine it is now 2 x 8gb chips = 16gb ????
or do I have to buy 2x 8gb modules to replace my
2 x 4gb modules which are instaled but not now not showing up ??
If i take the new 16gb chis out, and replace all lsots with my old memmory i get 12 gb no no probs, i just cant seem to get past 16???
any help at all would be appreciated troops
many thanks in advance

Hi amoeba23,
I know its too late now, but in your position I would have imported 8GB RAM modules from OWC rather than buy them from Crucial.
Otherwise, I would have waited until Kingston started selling 8GB System Specific RAM modules for 2009/2010 Mac Pros instead.
To the best of my knowledge there is nothing on either the Crucial USA or Crucial UK websites stating that their modules incorporate Apple Specified Thermal Sensors, which probably means that they do not have them, and I would have avoided them for that reason alone.
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http://eshop.macsales.com/shop/memory/Mac-Pro-Memory#1333-memory
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That is another reason that I would have steered clear of their 8GB modules.
Unfortunately, Kingston do not yet market System Specific 8GB RAM modules for Mac Pros. Quite probably this is because Apple do not sell them, and have not yet officially approved this capacity for use in their Mac Pros. I say this because Kingston did not start selling 4GB RAM modules for 2009 Mac Pros until around about the same time that Apple did.
Regards,
Bill

I upgraged my macbook 2.4 GHz ram to 4g and now lower slot shows empty

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http://eshop.macsales.com/Reviews/MacBook/Testing/Memory_Benchmarks
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New ram installed and have black screen then it shutsdown after 45 seconds

ive installed an extra 2gb of ram on hp630 notebook and when i turn on it has a black screen then shuts down after 1 minute. i think maybe one of the slots dont work as the original 2gb ram that in it works in one slot but not the other . so when i put the 2gb ram in i get black screen then shut down but its the same it works in the bottom slot but not the top. any help would be a massive help. the slot i am trying to use hasn't ever been used.

Hi
Sorry meant to add , have you tried re-setting your BIOS to Default just to make sure 100% that your BIOS setting is not causing an issue .
Checkurtech
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I installed apple ram into my macbook and it would not boot up. It simply beeped.

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This article from Microsoft should explain why you are seeing what you are seeing.
http://support.microsoft.com/kb/978610
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Message was edited by: LeSpensive

It is possible that it is actually the Main Logic Board. Perhaps even a graphics card that is causing the problem. I would take it back and be sure to mention the squares that pop up.

Ram lower slot - PB won't start

Hallo
I tried moving my 512 mb ram from upper to lower slot and got a beep at boot (just like calling a busy phone) and the lid white light blinking. I found that is a known issue but....is there a way to fix it? I would like to upgrade to 2 gb

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New ram, install in upper or lower slot? Any difference

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