Mac Pro memory upgrade

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edta Author

Level 1

0 points

Mac Pro memory upgrade

Hi,

My mac pro is 1,1 and want to upgrade the memory.

but I found that there are 2 types of memory,

The first one is

"2GB, PC2-5300, DDR2-667, 667Mhz, Dual Rank, Latency 5-5-5, ECC, Fully-Buffered, 256x72, 1.8V, 240pin FB-DIMMs" ($300 for 8GB )

http://ramjet.com/ItemDescription.asp?Item=MPx4G

and another one is

"2GB 240-pin FB-DIMM 256M x 72, 1 Rank ECC Module 5-5-5 667MHz TRUE PC5300 5.3GB/s" ($227 for 8G , 1 Year warranty)

http://www.dvwarehouse.com/8GB-Kit-(4x2GB)-DDR2-667MHz-PC2-5300-ECC-FB-DIMMs---- ---NEW-p-32412.html

Can anybody tell me what is the difference between Dual Rank and 1 Rank ?

Thanks in advance.

Cheers,

Edtayin

Posted on May 6, 2011 5:28 PM

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Answer 1

Best reply

Grant Bennet-Alder

Level 10

127,141 points

May 6, 2011 6:24 PM in response to edta

You can study up, and eventually you will know enough about this complex issue. Then you can make a one-off purchase. If you did not make any mistakes, it will work. Otherwise, you will own a very expensive doo-dad.

Or you can do business with vendors who have expertise in Macs, offer a "money-back if it does not work" guarantee, and a lifetime warranty.

RAMJET is one such vendor. Here are two more:

http://eshop.macsales.com/shop/memory/Mac-Pro-Memory#667-memory

http://www.datamemorysystems.com/_apple_info/Apple_Mac_Pro_Quad_Core_2.66GHz_Mem ory_1365.asp

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Answer 2

Kappy

Level 10

361,741 points

May 6, 2011 6:25 PM in response to edta

Prefer dual-rank memory for the Mac Pro. Install RAM in matched pairs or for best performance install in matched quads.

Be sure the modules are FB-DIMMS (fully buffered) with ECC and have the required heat sinks. 667 MHz is the required speed. There is no advantage to installing 800 MHz modules.

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Answer 3

edta Author

Level 1

0 points

May 7, 2011 1:33 AM in response to Kappy

Thanks for your help.

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