Ahh, well yeah your system is going to run better with PC2700 lol, now you have a 1:1 ratio....but still any valueRAM will do that, and generally without and raising of voltage.
Use CPU-Z and check the SPD tab, that tells you what timings it'll run under different speeds.
You basically cleaned up a bottleneck so that will help for your computer improvement, but yeah as far as a sandra test go using the memory test, the PC3200 will undoubtedly win