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Apple Desktops Discussion of Apple's desktop machines including Mac Pro, iMac, Power Mac, and mini

Mac Pro - Mac Pro RAM questions


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Icicle

 
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Wow, Im new to this whole 2 processor thing I guess.....

DO I have to buy 2 DIMMs in order to pop them in my new 3.0 Ghz Mac pro?

I bought one http://www.newegg.com/product/produc...82E16820161044 and My computer isnt recognizing it at all unless I pop it into one of the slots in place of a stock one, and then it only recognizes 512MB of it (assuming because thats all the other stock one left in is?)

So, to clarify, I assume I need two? and they need to be in the second set of DIMMs right? (2 on top card, 2 on bottom card)

Can I just go to COMPUSA and buy another one? or do I need to order the exact same one from newegg so they match?

Thanks guys, I thought I was pretty good at this stuff, I think I just got a wake up slap from the tech gods....

Kevin, Spokane Washington USA
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Alexis

 
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It says server RAM, which may be causing the problem?
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bobtomay

 
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Per the Mac Pro Manual on changing / adding memory and available here - memory must be added in pairs and each module within a pair must match and be from the same manufacturer. Pairs do not need to match each other.

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Icicle

 
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Awesome, thanks for the instructions link and info, I will just order another one then.

Kevin, Spokane Washington USA
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novicew

 
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You seems to have bought the wrong RAM. Take a look at this article.
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bobtomay

 
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Don't know about this being the wrong RAM. According to Wintec's page it meets all the specs except they do not mention if it is registered or unregistered memory.

While I am not familiar with Wintec, most memory manufacturers will list registered memory in their specs while with un-registered memory they will make no mention of it.

A quick call or e-mail to Wintec should answer the question.

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NanoBite

 
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Well it seems everyone beat me to it but here is my 2 cents worth.

Quote:
The Mac Pro computer introduced in August 2006, based on the Dual-Core Intel Xeon processor, provides eight RAM slots that accommodate 240-pin SDRAM Fully Buffered DIMMs (FB-DIMMs) up to 1.25 in height and up to 1 in width. The FB-DIMMs must be PC2-5300 compliant and must be unregistered, 8-byte, nonparity, and ECC.

The Mac Pro ships standard with two 512 MB, 667 MHz, SDRAM FB-DIMM installed, for a total of 1 GB. The largest capacity FB-DIMM supported is 2 GB, with a maximum memory capacity of 16 GB.

The memory controller supports 512 MB, 1 GB, and 2 GB FB-DIMMs, installed in identical pairs.

The width of each 667 MHz memory bus is 72 bits (including ECC). The Mac Pro supports a CAS latency of 5.

FB-DIMMs made by other manufacturers that do not include a sufficient heat sink may cause the fans to run faster (and louder) or the memory chips to run slower so as not to overheat.
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Icicle

 
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Its the right RAM, it works with one of the stock ones actually, I was just unaware of the needed matching pairs until you guys mentioned it, THanks for all the info I will just order another and be all set with a GIG more than I planned on, not a bad thing altogether I guess

Thanks all for the friendly help

Loving this new machine

Kevin, Spokane Washington USA
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DigitalJesus

 
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do the mac pros come stock with ECC memory? pairing ECC and non-ECC will cause issues.
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NanoBite

 
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Taken from post #7:

The FB-DIMMs must be PC2-5300 compliant and must be unregistered, 8-byte, nonparity, and ECC
.
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Fijiji

 
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All the MacPro models must be paired ... Must be matching pairs these are dual channell modules so if you use different modules in a pair your computer will be intermitant crashes and kernel panics .... Put each module matched in pairs of 2 ... then you may use other brand for secong 3rd and 4th pair.
Let me know if it helped.
Fijiji
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