I need a little help here, Ive been trying to overclock with Bios's newer than 1478 and have been unsuccessful

Bios 1478 Settings
Fsb 450
Ref Freq 400
Mem Freq 1333
Mem Timings 7-7-7-20 2T


Bios 1521 & 1554 Will not operate at these settings, I think its the sub timings that are hanging me up but I have not been able to find the right settings.. It looks like with Bios 1478 my sub timings are 60,4,10,5,5 (from everest under chipset), I cannot run these timings with newer bios's and I've even tried 88,5,12,6,6 and still no go..

If anyone can suggest some different settings I would very much appreciate it, fornow I'm just sticking with ver 1478..