Thanks I tried very hard to get over 40k, don't know whats up with the chip. 6 GHz ran just fine through cpu test but I got BSOD as soon as I started graphics test, over and over again. 5,8-5,9 was ok.
I remember asus crosshair III + turboV being real nasty and setting 2.5 vdimm on my hypers back in the day. Since then I'm generally suspicious against software.