When you ref clock that board does it effect the IGP clocks? Most of the 790 IGPs would OC at least 100% that I have seen, but maybe your was already set higher and BUS clocking put it into nomans land?
Also check CPUZ and make sure that your settings are actually taking hold. Had some issues with that on my Foxconn.
Apart from that, just a crappy clocking board. MY M4A79 Deleuxe crapped itself at 258. Anything over 250 was squirrely. Saw older BIOS revision running 300 tohugh, but my board was newer than BIOSes capable of running such a high HTREF. A force flash to the older BIOS led to immediate reflash of a newer one.
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"Don't You understand? This is Greek to me! Except I spek Greek, this is like Aramaic to me, and not the Western Dialect I can read a little." - Dr. Walter Bishop
Special relativity is not "Eat Two Big Macs."
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