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Memory upgrade for 2 x 2.8 GHz Quad-Core Intel Xeon MacPro

I have a MacPro 2 x 2.8 GHz Quad-Core Intel Xeon - The memory in there is 6GB 667 MHz DDR2 FB-DIMM. I want to upgrade the memory but when I look the memory recommended is 1066MHz DDR3 ECC Module with thermal sensor, Will this go with the memory I have? Specs
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mrmyth
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mrmyth
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joelsplaceCommented:
No.  DDR2 and DDR3 are totally different.  The recommendation is wrong.  Try Crucial's site.  They have a tool - don't know if it will work on Mac.  They also have a memory selector.  They keep logs of how many sticks they have sold to people for specific machines and how many returns they get to keep track of compatibility and accuracy of their selector.
That said I would buy the memory from Kingston after finding out what you need.  I have a whole stack of lifetime memory from Crucial that they won't replace.
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Amit KhilnaneyCommented:
Yes, that will definitely go with that but the issue is even if you put higher frequency memory i.e. 800/1066 that gonna end up i.e. speed limited to 667 since the memory already in use is 667..

It is limited by any of the components (be it either processor or memory). If your processor supports 800 then it doesn't matter even if you put 1066 memory that will be speed limited to 800.

Example: I was using Celeron 530 which works at 533 Mhz

but one of memory stick was rated at 667 and other i bought was rated at 800.

but speed limited by processor to 533 Mhz.
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Amit KhilnaneyCommented:
The other thing you can look at which definitely impact the performance is CAS Latency

You can download a tool called CPU-Z from cpu id

to determine the CAS Latency

Normally, all standard memory modules are rated at same CAS Latency

It will be best if you buy memory from same manufacturer, model and frequency to get full compatibility or unexpected surprises in case of different manufacturer.
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joelsplaceCommented:
*NO*  You cannot upgrade 6GB 667 MHz DDR2 FB-DIMM with 1066MHz DDR3 ECC.  They are not the same thing.  You can go with a higher frequency but it has to be the same type.
There have been some boards produced that had slots for different types of memory but you have to have just that - a different slot.  AmitKhilnaney are you saying his Mac has slots for different kinds of memory?  I don't claim to be a Mac guy.
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Amit KhilnaneyCommented:
ok, i misread the question, you cannot use ddr2 with ddr3. I guess your motherboard have different slots for DDR2 and DDR3. You can use either one of them but not at same time.

DDR3 cannot be used with DDR2. Just look for another DDR2 if available on the motherboard, then you can upgrade memory by adding another DDR2 stick.

I guess you are using 4GB + 2 GB configuration. and you have two slots each for DDR2 and DDR3.

You may have the only option to replace 2GB DDR2 stick with 4GB DDR2 stick or change the memory completely to DDR3 which may be expensive..

But i may be wrong since you mentioned 2 x Xeon that mean you have dual processor motherboard and it can have more memory slots than i think.
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joelsplaceCommented:
I doubt it has DDR3 slots at all.  I've never seen a Xeon board that had both.
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mrmythAuthor Commented:
I was looking on Kingston at the wrong model. Apparently kingston is no longer supporting my model which is a 2008. I found the DDR2 800mhz RAM I need afterall. Thanks!
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