Googled "P5N-E SLi overclocking guide"; first link is:
Legion Hardware
Overclocking is a learning process; every single motherboard has different settings and every motherboard/CPU/RAM/PSU combo will yield different results. In this case, the guide uses an E6400, while you have an E4300. Different FSBs will give different results.
By learning overclocking, one would understand that and apply this knowledge to have a stable overclock, instead of following a very simple guide of "Seriously Easy E6400 Overclocking Guide From 2.13GHZ to 3.5GHz in 3-Easy Steps!"
Pathetic. Sorry for the rant, it's not personal. But overclocking has become mainstream, where most computer owners want to overclock in a very fast, very easy manner.
Overclocking is easy, but having a
stable overclock is pain-stakingly slow process, and may be very difficult to achieve.
John