Installation problem with Mac Pro RAM
in [Mac Systems]
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From: Salmon Egg on 14 Feb 2010 00:44 Encouraged by posts here, I installed a 4GB memory module in my Mac Pro. The physical insertion of the RAM seemed easy easy and trouble free except for not being sure what to do when doing it for the first time. There were three 1GB modules in slots 1, 2, and 3. This tells me that on my model Mac Pro, memory does not have to be added in matching pairs. The easiest thing to do was to insert the new 4GB module into slot 4. Upon turning on the machine I got no startup chime and the power indicator was flashing. I thought that maybe the 4GB had to be in another slot. Again, I took the easiest path and interchanged the position of the 4GB module with the 1GB module in slot 1. That put 1GB modules in slots 2, 3, and 4 and the 4GB module in slot 1. I had the same result--no startup chime and a flashing power indicator. I next removed the 4GB module without changing position of the 1G modules. The computer started up just fine. I did get a message that the modules were not in the optimum positions. Nevertheless, I am using that configuration as I am preparing to post this message. There is a good chance that I will go to Fry's tomorrow where I bought this module. I would like to resolve the problem before then with the hope thatI will not have to make a complaint. Meanwhile, I will try to find out what the optimum positions for the memory modules are. Also what is the significance of the flashing power indicator. Any help that I receive that shortens my learning time will be gratefully appreciated. -- An old man would be better off never having been born.
From: JF Mezei on 14 Feb 2010 01:12 Have you tried with only the 4gb memory plugged into slot 1 and others slots left naked ?
From: JF Mezei on 14 Feb 2010 01:27 Look for a document titled "Mac Pro Users Guide.pdf" on your Mac. It does have a whole chapter on replacing memory. Note: Some memory limitations on Xserves were lifted with Snow Leopard. Not sure if they were also lifted with Mac Pro. In page 41: Your Mac Pro comes with 3 or 6 GB of memory, installed as 1 GB unbuffered dual inline memory modules (UDIMMs). All installed UDIMMs must meet these specifications: � PC3-8500, 1066 MHz, DDR3 SDRAM UDIMMs � Error-correcting code (ECC) � 72-bit wide, 240-pin ECC modules � 36 ICs maximum per ECC UDIMM Check with your memory vendor to ensure that the DIMMs support the correct timing modes and that the Serial Presence Detect (SPD) feature has been programmed properly, as described in the JEDEC specification. To check the compatibility of your DIMMs, see the Macintosh Products Guide on Apple�s website at www.apple.com/guide. Here is the paragraph which may be of concern: ## Before you install memory, determine whether you have a quad- or 8-core Mac Pro by removing the side panel following the instructions on page 37, and looking inside: - A quad-core Mac Pro has one processor and four memory slots. You can install 1 GB or 2 GB DIMMs for a total of up to 8 GB of memory. See �Installing Memory in a Quad-Core Mac Pro� on page 43. - An 8-core Mac Pro has two processors and eight memory slots. You can install 1 GB, 2 GB, or 4 GB DIMMs for a total of up to 32 GB of memory. See �Installing Memory in an 8-Core Mac Pro� on page 52. ## Note that for a 8core (2 CPU) machine has 2 memory banks of 4 slots each. Not sure why the 1 CPU unit would not be able to The utility to check your memory: /System/Library/Core Services/Memory Slot Utility.app But it doesn't seem to do much , it is just a dialogue telling me my memory is fine.
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