IP-35 overclock issues

[Platinum]

Just upgraded to a Abit Ip-35 from there MATX Fatality mobo in the hopes I could get a little more from my CPU , its a E6600 thats been running for months on the other mobo at 9x 350, from reading round it seems 350FSB was the limit of that board.
Anyhow I have now set the IP35 to the same settings increased the voltage slightly as I did on the last board and after 4 hours orthos fails, now I think that happened on my last mobo but other than that it never crashed so im not to worried.
Now the voltage is at 1.265 atm but I cant get orthos to run for any more than 15 mins at any speed above 350FSB no matter the CPU voltage, I even tried up to 1.365v!
No I cant imagine that the CPU has hit its limit as im barly increasing the voltage here so im thinking theres something im missing in the bios?
Can anyone help?

[BUFF]

what RAM have you & what DRAM voltage & ratio have you set?

[Platinum]

OCZ PC6400 Platinum, 4gb set to 2.1v, running 1:1 divider so the ram is running slower than stock.

[BUFF]

4x1Gb?
try tweaking the CPU VTT & MCH voltages.