overclocking this bad boy

[turbotoaster]

any idea where to start with this cpu

FX- 57 runs 200x14 stock
ive got G.Skill 1GB DDR FF PC4800 (2x512MB) Dual Channel Kit
MSI K8N Neo2 Platinum nForce3 Ultra
was on core centre last night and turned it to 215mhz which it read 3gb, but it actually changing it or is it just showing what it could be, i then changed it in the bios and it wouldnt boot, ive read the newbie guide but was just wondering should i be looking at the core centre or doing everything through the bios

 

[turbotoaster]

bring on 4gb LOL

 

[turbotoaster]

new problem, when i press enter on the clock frequency to turn it down from 5x to 4x it locks up, wont let me change it and wont even bring up the options, any ideas what it could be, oh buy the way running pcmark05 last night temps peaked at 45 degrees, so the coolers doing its job