ATI 4850/4870 voltmod thread

[Vatos_locos]

Since uPI Semi so inconveniently pulled the data sheet and detailed specs for the uP6206 from their site, I was forced to make an educated guess at the location of the FB pin. AFAIK, I'm the only one who has tried this mod but the card has been running at 1.35v for a few days now without issues.

For the uninitiated, make sure to first set your VR to its highest resistance before adjusting it down to the desired level while monitoring the voltage. You do not want to start with the VR set to zero ohms.

Disclaimer: Using this mod will void your video card warranty and you alone shall be liable for any resulting damages. PERFORM THIS MOD AT YOUR OWN RISK AND DON'T TRY THIS IF YOU CAN'T AFFORD TO LOSE THE CARD!

ΟΚ 10κ Vr is not working on the sapphire it dose not adjust the voltage at all

and yes it is soldered correct on the card it gave the card a small bump on the voltage from 1.32V it went 1.36 but thats all not more

how many Ωhms do you measure from the soldering spot to the ground ? are you sure it 10k your vr ? as i measure we need a ~500k vr not a 10k

EDIT

500k Vr did the job fine :p