|Intel systems (except the P4 & it's derivatives) should be run with the FSB:DRAM at 1:1. The P4 was an inefficient design & performs better with the RAM running slightly faster...usually 4:5 or 5:6.|
Early AMD systems performed best at 1:1. AMD systems since the 1st A64 don't have a FSB so there's no ratio to recommend. Generally, you just run the RAM as fast as possible.
There are a few constants for both systems. It's best to lock the PCI, AGP or PCI-e buses at their defaults:
PCI = 33.33MHz
AGP = 66.66MHz
PCI-e = 100MHz
One thing I'd like to add is that some sites/forums refer to the ideal ratio as 2:1. That's correct as long as you understand that they're using the data rate numbers rather than the actual frequencies. For example, your CPU is running at 1600MHz QDR FSB & your RAM is running at 800MHz DDR so that would put the ratio at 1600:800, or 2:1. Technically though, the ratio should be calculated using the frequencies, just as CPUZ shows it. Your's is 400:400, or 1:1.
"would it hurt to speed the cpu up to 3.2?"
All you can do is try. Just raise the multiplier from 7.5x to 8.0x & see what happens. You *may* have to increase the CPU voltage though. Do you know how to recover if the system becomes unbootable?