just fitted a e8400 cpu in a gigabyte GA-P41T-D3 motherboard. 1st tried to up the fsb to 366 from 333 and it blue screened. then tried 345 fsb and same result. i have a 4gb ddr3 8500 ram module fitted in one bay. any help to get up near 4ghz would be nice.
4 Ghz (or anywhere near it) is not going to happen
The G31/G41 chipset is an economy, entry level chipset with a limited FSB freq range.
It's a pretty good overclocker with CPU's that have a 200 MHz FSB and OK with CPU's that have a 266 MHz FSB. Unfortunately, it is a poor overclocker when used with the E8200 series because of its limited FSB. If you are very lucky, you can achieve a 10% overclock at the most.
Unless you get really lucky, you will not be able to push the FSB freq past about 360 MHz. I have 3 G'byte G41 boards. I can push the best of them to just under 360 MHz.