Well, I am having memory issues with my board. I can get my ram memtest stable but not in windows. I flashed to the F4 bios to see if that would help, and so far it hasn't. Here are my settings:

for DDR1910:
CPU Ratio 20
Turbo and HT both Enabled
QPI Link 36x
Uncore 20x (3820)
Isosync On
Bclk 191
Perforance: Std.
Spd 10
Timings 8 8 8 20 1t
Loadline Enable
Vcore 1.40625
QPI 1.395
IOH Auto
VDIMM 1.75

These settings are memtest stable for at least 30 passes of test 5 (that's all I've run up to now). I've also tried DDR 1528 with no luck as well. The only differences in the settings are:
SPD 8
Timings 7 7 7 20 1t
VTT 1.375
VDIMM 1.66

This issue is starting to drive me a little crazy.