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Old Mac Pro 667mhz memory in New 800mhz Mac Pro - mix and match ok?

It will work, but it will cause all the memory to run at 667MHz and, hence, you will take a bit of a performance hit.
 
I might be wrong but i thought the old mac pro memory wasn't FB-DIMM but just regular ddr2 memory?
If that's the case i don't think it would even fit in the 2008 mac pro DIMM slot.
 
hatehereyes said:
I might be wrong but i thought the old mac pro memory wasn't FB-DIMM but just regular ddr2 memory?
If that's the case i don't think it would even fit in the 2008 mac pro DIMM slot.
Click to expand...

Wrong. They're both FB-DIMMs. The first was 667 and the current is 800.

But the next Mac Pro won't be FB-DIMMs and will run at 1333.
 
I think it will run but it is not advised. The price difference isn't substantial enough.
 
Thanks, all.

Apple is replacing my old mac pro with new one and I have 11gb of old ram and new one coming with 8gb, wondering if I could fill remaining 4 slots without having to buy new memory.
 
As I've said before 667MHz FB-DIMMs will work fine in the 2nd gen Mac Pros but will cause all the RAM in the machine to run at 667MHz instead of the optimal 800MHz.

I know it works because I did that when I first transitioned from 1st gen Mac Pro to 2nd gen.
 
Thanks - that's exactly what I wanted to hear. 1st hand experience always trumps the internet experts who repeat what they've read somewhere.

The barefeats reference was also very helpful - I'm actually quite shocked how little an impact it seems to cause - from 0 to 4% hit.
 
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