Lately I've been trying to lower the memory clock on one of my cards and every time I try my entire system locks up and I have to restart.
I'm mining with 2 cards, a 5850 Xtreme and a 5830 Xtreme, both from Sapphire. If I just lower the memory clocks to 900Mhz in the CCC everything works smoothly. So, I was looking around on the forums about how to lower the memory clock beyond that. I found a thread advising people to try using MSI Afterburner to get the clock all the way down to 300Mhz. The problem is after I open MSI Afterburner and select the 5850 and try to lower the memory clock below 900Mhz, after about 10 seconds my entire system halts and I have to reboot. Catalyst seems to get a little fussy after this too and I've noticed that when I try to plug in my second monitor my computer will eventually halt again. I fixed that problem by completely removing catalyst and doing a fresh install, but then that leaves me back to square 1. Does anyone know how to fix this issue?
Oh and if it matters I'm using the 11.5 Catalyst drivers on Windows 7 x64.
Sorry to hear. I havn't had that problem. Im running dual HD 5830's with MSI afterburner - no problem.
-Are your cards overclocked?
-What is your PSU wattage?
-What temp is your GPU running @?
The 5850 has a very minor overclock of 800Mhz on the GPU clock, but I've done this with the default clocks too and I'm still having the same problem.
I'm not using crossfire, PSU is 650 Watt and it's Corsair if anyone is curious, but wattage isn't an issue here. Lastly, with both cards mining simultaneously and the memory clocks at 900Mhz they are running at 69-70C each.