Overclocking help

[PukePile]

Greetings fellow geeks.This is my frist post on the forums but I've been a reader of tomshardware guides for some time now.I was hopeing you all could help answer some questions I have about increasing my systems performance.
My question is how much chould I over clock with the default intel heatsink and still be relatively safe from burning up my chip.My system now runs about 40ºC. Also I was thinking about getting a better heatsink. How much more effective would my cooling be with a copper heatsink? and could you recommend one?

And here are my system details and benchmarks

AquaMark Score: 29418 (CPU: 5995, GFX: 3897) FPS: 29.42 TPS: 8855 K

3DMark Score 3655 3DMarks

CPU Score 466.0 CPUMarks

3284 PCMarks

General Information
Operating System Microsoft Windows XP

DirectX Version 9.0b

Mobo Manufacturer Gigabyte Technology Co., Ltd.

Mobo Model SiS-645
Motherboard GA-8SR5433P

AGP Rates (Current/Available) 4x / 1x, 2x, 4x

CPU Intel Pentium 4 2412 MHz

FSB 133 MHz

Memory 512 MB



Display Information
Graphics Chipset ATI RADEON 9700

Driver Name RADEON 9500 PRO / 9700

Driver Version 6.14.10.6404

Driver Status FM Approved

Video Memory 128 MB

Core Clock 277 MHz

Memory Clock 270 MHz



Sound Information
Sound Adapter Driver Name Avance AC97 Audio

Sound Adapter Driver Version 5.10.0.3840

 

[PukePile]

Also if any know a good compressive guide for over clocking that would really help.