I just got my sapphire 7850 non-oc. I had some problems with it first because there is no display when I first booted up my pc. After some reseats and restarts I got it working. I was able to play some games with it and after a week I decided to try to OC it (might be regretting it now).
It was just a mild OC.. just up to 1050/1200 and I lowered my stock voltage a little. It survived a heaven benchmark run and I even go to play games on it for about 2 weeks (not all the time though just at night time and on weekends).
Then one day when playing another game.. it just crashed. I restarted the pc... which most of the time will have its DRAM_LED lighting continuously.. I then have to press the MemOK! switch to make it boot correctly.. Using an ASUS p8z77 mobo. I also had problems making it display as well.. reseating and restarting the pc many times + waiting made it work again.
I don't know if it is a memory issue because the light there keeps on acting up when my pc crashes.. but running MemTest did not show any errors.
So after trying the game again and crashing again I decided to go back to stock settings. I tried again.. crashed again. I tried running the benchmark.. crashed again. From catalyst 12.4.. I upgrade to 12.6.. same thing..
Really depressed.. Is my card dead? Should I increase the voltage? My ASIC quality is 77.9% though if it helps. I already emailed Sapphire using their support ticket thing but have not gotten any response.. I don't know what to do..