Hello again! Failed to force GTX295 driver installation (This Windows version is not supported.) So I reseted the bios to default values, restored the power plan to their default values (I use Max Power), installed the original box driver of the graphic card (258.56), changed the power cords of the gtx460 from 2 pcie cord 6-pins to 2 molex-to-pcie adapters (included with the gtx460). The only thing that happened is, that the load switched from cpu3 to cpu2. http://www.mediafire.com/?b58759b11am91v1 I checked the gpu temp, see *.gif in attachements. Its a Thermaltake Thoughpower XT 675W, at the moment Im running one card over 2 molex-to-pcie adapters I mentioned above without changement. Sounds like a broken hardware of the moBo to me. Softwarerollback should have eleminated any driver collisions, RAM's are ok, gpu-mem ok. Could check cpu with the OCCT cpu stress test and gpu stress test. When I connected My usb3 drive after the LAN party, I got an error message, Voltage overload on the usb3 port, perhaps it has something to do with that, cause the asrock p55deluxe3 has a optimisation of ther pciexpress lanes between graca and sata3 and usb3.