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Discussion in 'Mac Pro' started by pprior, Feb 3, 2009.
Can you mix old mac pro memory in the new mac pro?
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.
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.
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.
Another unsubstantiated guess.
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.