P5n-e SLI wont OC my 4300

could be your weak psu, or a ram limitation/fault run memtest, if it checks out, then try to find a better psu(maybe a friend could loan you one) and use that, see if that helps. also is it not posting or not booting windows?

It could just be that you got a bad week, and there is nothing you can do about it. I got my E6600 to 3.2ghz, but it took 1.418 volts to do it, which is really high.

there is no way stepping would effect an OC by 1ghz+ man

If I set it too high, it will fail to post. So, I tried putting the Vcore to 1.41 V and it went up to 2.8Ghz. Is it possible i just have a bad chip or something which doesnt overclock on a low vcore? Does this also rule out the possible PSU cause? I took the Vcore back down to 1.37V and took the speed back to 2.4 because I was too scared I would cook something. Whats the most I should pump the Vcore up to before I should stop?

Cheers

sounds like a psu thing to me, but I can't say for sure. I don't think it's the ram though, so I would say try another psu if you can, but you cant rule out a bad chip yet

It sounds like it probably is your power supply since you can get it to that speed but it just requires you to increase the voltage. What's the voltage reading from when you're within windows?

oh yeah what is your northbridge at right now, not the voltage the strap

umm okay, somewhere in your bios, there is an option for the north bridges "strap" or that is what it is called on my bios, it should have diff fsb options if you see you try manually selecting the first, second, third, ect... option and see if your computer will post.

Have you read in here yet? http://www.overclock.net/intel-mothe...0i-thread.html
It's an entire thread just on the P5N-E SLI motherboard. The first page provides somewhat of a guide. And if you don't feel up to reading all 250+ pages, you can always just ask =)