thats a good question, my best gues is that 1gb stick would be better as it would be quicker for the computer to put stuff in the memory but dnt quote me on it.
Thanks for the info. I'm trading out my OCZ 1GB stick for a Corsair 1GB. Hopefully I don't have any problems with them. OCZ managed to package a 512 stick in my 1GB package. Not that this makes me think any less of OCZ, mistakes will happen. However, I've read a lot of forums posts and reviews stating compatibility issues a lot of P965 mobos have with OCZ for some odd reason. No bad news about Corsair though