Adding more memory with different cas latancy?

[dpaige11]

I currently have a Athlon64 3800 x2 with 1GB (2x512) of 2-2-2-5 memory in a dual channel configuration.

I want to upgrade to 2GB of memory. Can I buy non 2-2-2-5 memory?Which of the follow options would give me the best performencerice ratio?

Buy two more 2-2-2-5 512GB sticks?

Buy two non 2-2-2-5 512GB sticks?

Buy two 1GB memory sticks to replace the two 512MB chips I have?

 

[smartel7070]

IMO would be better to go with 2x1gb .... better stability and no compatibility issues about timings