Hi guys.
I want to overclock my AMD Athlon 64 X2 4000+ With 1GB DDR26400 800MHZ RAM Nvidia Geforce 8400GS 256MB 160gb HDD 400W PSU and Asus M2N-X Motherboard The motherboard has a 1mhz step increase thing in the bios and a Nforce Chipset.What is the max I could get out of this system and how could I do so. Help appericiated.

Did you bother to using the search feature?

Lock the PCI-e at 100MHz, disable all Spread Spectrum settings, raise the CPU frequency from 200Mhz to 250MHz, lower the HT multi (LDT) from 5x (1000MHz) to 4x (800MHz), lower the RAM setting from 800MHz (or Auto) to 667MHz. Be prepared to raise the CPU voltage if the system is unstable.

Your 400W PSU *may* be inadequate for your system...it depends on the brand & the amperage rating of the +12v rail(s). And the 8400GS was a poor choice, especially for gaming.

I wasn't gonna use the system for gaming and the 400w came with the case and peforms fine. Thanks for the overclocking tips though oops I should have used search.

"I wasn't gonna use the system for gaming"

It doesn't matter. The PSU is still *possibly* inadequate. And if it's one that was prepackaged with the case, it's even more likely...unless you paid $100 or more for the case/PSU combo?

It was a $70 NZD cause so your right. I wil lget a better PSU when I can another thing the overclock worked great thanks.