I have recently upgraded my computer RAM from 512mb(2x 256mb) to 1024mb(2x 512). THe orignal memory was PC2700 DDR 333 Mhz, the new memory is PC3200 DDR 400Mhz. If I install the old memory along side the new memory, will this compromise the performance of the new memory. I understand that by running 2 different speeds, the computer will run at the slowest speed. i.e 333Mhz. Which config would give the best performance a) 2x 515mb @ 400Mhz (1054mb total RAM) b) 2x 512mb @ 400Mhz, + 2x 256mb @333Mhz (1068mb total RAM) Can anyone shed any light on this ?