help me on asus eah5870 overclock

[critical]

hi, i own a asus 5870, but no matter how i overclock with sapphire trixx, once i on guiminer, start a while, screen black out or reboot

in sapphire trixx by default it shows. 850 core, 1200 memory, but gpu voltage 793 only (can't adjust)

anyone can help me out,

or should i use msi afterburner?

my graphics card look like this

[1715427469]

1715427469

[1715427469]

1715427469

[1715427469]

1715427469

[Pipesnake]

in sapphire trixx by default it shows. 850 core, 1200 memory, but gpu voltage 793 only (can't adjust)

There's your problem.  You should be running 1050mV at the minimum.

[critical]

problem is, its locked, there is no adjustment, weird ya.

[critical]

could this be the problem:

the card came with this:



i used this




i thought power draw should be same

[Pipesnake]

What is your power supply wattage?

Don't you have a dedicated 6 pin?

Voltage is way low.  MSI Afterburner will let you increase the voltage but if you're not supplying enough power to the card it won't matter.