Amount of additional RAM and Distribution of it

[Boneoh]

I think you'd be better off going ahead and adding in the extra memory. You're described usage would benefit more with the increased capacity rather than going for max bandwidth.

I remembered reading this some time ago.

http://www.macperformanceguide.com/Reviews-MacProNehalem-Tests-Memory.html#Bandwidth

 

[ehlfg]

First there are only 1GB, 2GB and 4GB sticks available. It seems you cannot mix third-party 4GB sticks with other sizes but I don't think anyone has reported problems mixing 1GB and 2GB sticks. If you did, I'm pretty sure the two 2GB sticks should be in slots 1 and 5 with the 1GB sticks in 234 and 678.

Hmm, just saw this. I ordered a 2008 3.2 GHz Octo that has 2GB of memory and have also ordered 2x4GB RAM from Crucial. Will I be able to mix the 4GB sticks with the existing RAM?

 

[Flash SWT]

Hmm, just saw this. I ordered a 2008 3.2 GHz Octo that has 2GB of memory and have also ordered 2x4GB RAM from Crucial. Will I be able to mix the 4GB sticks with the existing RAM?

My post you quoted was discussing the 2009 Mac Pro which has different RAM requirements than the 2008 and previous.

 

[ehlfg]

My post you quoted was discussing the 2009 Mac Pro which has different RAM requirements than the 2008 and previous.

Thanks, that's good to hear.

 

[nanofrog]

Thanks, that's good to hear.

In your case ('08 MP) you can mix them.