Do you have the newest BIOS? If not, download the newest and flash it, this could help.
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Phenom II 940 @3.40GHz 1,35V|Xigmatek HDT-SD964|Foxconn A79A-S|4GB Kingston HyperX 1066 CL5 2.0V|Sapphire HD4830 512MB|Sharkoon Avenger|LC6600GP2 600W
http://www.sysprofile.de/id99196