I tried Keys mBIOS 1206 and I see no difference in the BIOS.

Also.

At the moment with my E8500 I am running prime blend, 4.23Ghz, 1.44V, hitting 75-76 degrees but now and then goes lower, this is going to be my 24/7 overclock I think, I might just wack it to 4050Mhz and run it at 1.35V though and say no more.

In bios my current settings:

FSB : 470
FSB Strap : 400
RAM : 1:1
CPU Voltage : 1.5000 v
CPU GTL : 0.64/0.64
CPU PLL : 1.52 v
FSB/VTT : 1.30 v
DRAM : 2.04 v
NB : 1.30 v
NB GTL : AUTO
SB : AUTO v
PCIe : AUTO v

Other settings:
5-5-5-5-15 on ram, the other timing that people say manually set is at 50.

DRAM Static Controlisabled
DRAM Read Trainingisabled
MEM. OC Charger:Enabled
AI Clock:Lighter

PL setting to 10, dont want to try 9 with fsb unstrapped as anything but 1:1 was too high.

Does SB and PCI-E overvolted give more stability?

When you tried without FSB strap did you have 1:1 still? Apparently the P45 is very sensitive to 1:1 and when I tried it I noticed settings it to 5:6 or something made it boot so it might not be the fsb strap but the 1:1 that makes it not boot under PL10.