How to put my voltage up? 9800GT

[prorules]

Hey i have zotac 9800GT 1GB.
For now i can oc to umm well stock core is 550 i can do 670 fine.
and mem is 900 stock and i did 1020 fine.
But:
When i try 700 to core and 1050 to mem (shaders linked with core).
After gaming like 10 mins i get All screen artifacted and it stucks so i have to restart comp.
Wich probably means i need more voltage.
So how to add voltage i use evga percision and how much voltage should i add?
Temps around 68C

ty!

 

[renz496]

i don't think you can increase the voltage via software for 9800GT. you have to do it by volt mod method but it can be risky if you don't do it carefully. try googling '9800GT volt mod' for more info

 

[nforce4max]

You can but you will have to flash the card if you don't want any hard mods. Download gpu-z and in the utility download the bios from the card and load up nbitor then go to the next tab and check to see if there are any other values for the voltage. If it is already maxed out or no other values available then you are out of options. It is not worth it to vmod a 9800gt any more these days so if you are really starting to struggle performance wise then you need to upgrade.

Regular version or green edition without power connector?