Hi mate

Well that's a bit of progress.
Try increasing (G)
MCH OverVoltage Control : from 0.275 to the next setting up & retry prime. orthos only runs on 2 cores . see
Overclocker's Tool Kit. for download. If it fails try increasing it again. This will increase your
NB & mobo temp a little but won't be an issue.
if it fails again try DDR2 OverVoltage Control : +0.10v making it 1.90v
If you do get stable with the above. try lowering vcore a notch & retest, that should help your temps
keep us posted & good luck
