Overclocking 4850, how far to go?

[krisboats]

Okay, got my HIS Iceq4 4850 last week (cheers OCUK!) had a little play with overclocking it. From online reviews i've found that the turbox version of this card (clocks slightly higher... apparantly) tops out at about 700mhz on the core.

Well i've just gone past 700mhz with this card. Just wanted to make sure everythings okay and wondering what sort of temps i should be looking to stop at. How long should i stress test it too? I'm on 8 minutes now with no problems at 710mhz, shall i just keep going with it?

Got a screenie for anyone who would like it.

 

[krisboats]

I got artifacts at 735, so have dropped it down to 721 at the minute.

I guess the next thing would be a pencil mod or something then. Might wait a bit longer before i try this, it is only a week old after all

Onto the memory now then

 

[krisboats]

Started artifacting slightly higher on the memory. I'll leave pencil mods till next week, pretty chuffed for now though.

 

[krisboats]

You need to increase the volts... A bios flash will get you to 715-750 and the simple pencil mod should be good for 775-800+.

Apparently this board has a non-standard circuit layout so unless someone can find some exact details/images a pencil mod is out the question.