OK I need a little more help...
I lowered the FSB to 230 (3.45Ghz), set the ram to 400Mhz, VDIMM to 2.75 and the timings are at 2.5-3-3-6.
Sandra gave me these results...
RAM Bandwidth Int Buffered iSSE2 5508 MB/s
RAM Bandwidth Float Buffered iSSE2 5524 Mb/s
It's better than it was... except I keep getting an error in Prime95. I'm guessing I need to relax the timings more?
EDIT: FSB at 233, (2.5Ghz0, VDIMM at 2.85, timings at 2.5-4-3-6
RAM Bandwidth Int Buffered iSSE2 5607 MB/s
RAM Bandwidth Float Buffered iSSE2 5509 Mb/s
But again got an error on prime95... back to the drawing board