Originally posted by m3trj
1GB sticks have higher latencies and do not perform as well as 512MB sticks. You can still run 4 512MB sticks in dual channel however.
1GB sticks can have the same latencies, and latencies barely affects peformance.
However with 2 sticks of ram, you run the 1T command, with 4 you run the 2T command and this is a reasonable affect on peformance.
For future upgradeability, it's best to have 2x sticks so you can add more.
And, some AMD CPU's run 4 sticks at 333 speeds as earlier memory controllers could not handle 4 sticks at full speed