I want to overclock - what can I expect?

[PMKeates]

Afternoon all,

I'm interested in performing a little mild overclocking on my system. However, I'm not sure whether a good, stable overclock will be possible.

I've got the following system:

AMD Athlon X2 4400+ w/ SI-120 + Vantec Stealth 120mm
2GB Corsair XMS3500LL Pro TwinX
BFG GeForce 7800 GTX OC 512MB
DFI LanParty NF4 SLI-DR EXPERT


Anyone have any tips on where's best to begin the tweaking in this kind of system, or whether I'll be able to make anything worthwhile?

Thanks in advance.