I have noticed that if I change the settings in Trixx for my Radeon HD 6870 from stock to just a tad above stock the FurMark utility goes blank and I have to literally hold the on/off button to get the system to reboot. It seems the keyboard along with the display is rendered useless. I am running Win7x64 on a new prebuilt HP CPU FX-6120 6 core cpu @6GB ram GPU Sapphire HD 6870 PSU 650w with the usual 1TB HHD. My basic settings for Trixx is 900/4200 mhz respectively and I do not adjust the voltage which is 1.175v it runs fine in those settings but if I tweak em a little and I mean just a little to 925/4260 it (FurMark) stops working. Is this normal or do I have larger issues afoot?