Turns out that running the card with overclocking turned off is equivalent to OC'ing it to the max. When I enabled overclocking, the hashing performance _dropped_ significantly and the card became stable. So I started incrementing the maximum speed in steps of 50MHz, finally getting to stable at 900MHz (max is 960MHz, 950MHz is unstable). Strange, but I'm glad it works.

Hi all,

I've bought a Asus radeon HD 5770 for mining. I've tried poclbm, phoenix and hashkill. The last one is giving me the highest yield, up to 200 Mh/s. BUT: even on stock speed, using each of those apps, after a while, the GPU disables itself. Screen goes blank, the PC is still on (I can log on through ssh, everything is working) - except the mining is stopped and I can't get the monitor to turn on again.

The card is NOT overheating (about 74-76 degrees Celsius), the PSU is supplying enough power, card has been replaced by the seller once because of the same problem - the new one is behaving in exactly the same way. I'm using Ati drivers 11.6, 64 bit Linux (2.6.39 SMP), OpenCL 2.4 - did anyone have this problem? And perhaps managed to solve it?