Try to lower to 3x HT, this worked for me. 10 x 240 stupid stable (A643000) and with my MSI Neo (754) I had to lower the settings for my HyperX 3200 cause i populated all 3 slots.
Try: lower HyperTransport multi to 3x bzw 4x, try 166 mhz for your RAM (i know 4000 simply try it), lower the Cycle to 2.5 - 3, increase the voltage of your cpu to 1.6 - 1.65, watch temps, good luck.
My A64 3000 with the same board hits 240 x 10, but I got to dramatically lower the Settings...