How would I overclock a HD5670?

[Flightsimluke]

My System
AMD Athlon x2 215 (soon to be Athlon X4 630 )
4gb DDr3 1066mhz ram
320gb Hdd
ATi HD5670 sapphire 512mb
Pegatron M2N68-LA
92mm led case fan
400w OCZ stealthxstream psu

How much faster could i make it?

OVERCLOCKING NOOB!!

 

[sirheck]

Try this. http://www.techpowerup.com/atitool/

or this http://ati.amd.com/products/catalystcontrolcenter/index.html

 

[Flightsimluke]

i have just gone onto ATi overdrive and got core clocks from 775mhz to 790mhz.
How much of a performance increase?
Fan was at 40%, now at 70%
How safe?