Aussie,thx for the input

Can some of the more experienced clockers help me out a bit with tweaking 5000+ BE on this board? I tried 300x11 (3300 MHz) with 1.42v cpu,chipset and htt voltages +0.1v. When mem divider in bios was set to 533 MHz prime "max heat and power consumption test" ran fine for 30 minutes. However,when I raised mem divider in bios to 667 MHz which gave 942 MHz frequency,the blend test in prime crashes after 1 or 2 minutes.RAM is Crucial ballistix PC6400 and ive set all latencies manually in bios to slowest,with the 4 main ones beeing 5-5-5-15. Auto xpress is turned off. Not even 2.1v on ram helped here. If i need to raise voltages,which ones should I raise? If it helps at all,its always one core that crashes.Load temp in max heat test was 45C after 30 minutes with cpu on 1.42v/1,44 under load.