Originally Posted by chad4050
Ok when I overclock my card with cc or afterburner or trixx any kind of bump to core clock it shakes the screen and artifacts like crazy. Now if I use GPU Tweak I CAN GO UP TO 1175CORE CLOCK AND 1500 MEM and run heaven flawless and I played Fc3 for two hours flawless no artifats or shacking of the screen. I off couse verified my clocks with gpu tweak. I did not touch any voltages just power to 20% . My problem is I would prefer to use AFTERBURNER OR TRIXX I did not see any where to set voltage in gpu tweak? I also raised MY 2D clocks to 500. Is there something wrong with my card ? I have tried the xml trick and unofficial overclocking meathod twice no luck . I can also overclock in Gigabytes EASY6 BUT no voltage there either. So please help me if possible figure whats best to use that I can play with the voltages. The Rig in question is SIG RIG.
7900 series cards can be pretty tricky to overclock. It literally took me WEEKS of troubleshooting to get my card where i wanted it. I'm going to give you some advice that sounds weird, but it worked for my diamond 7970 and improved stability IMMENSELY. I am currently overclocked to 1235/1700 and stable @ 68c while furmarking. I could probably raise it to 1265/1800 but right now I'm very happy with the current performance increase and don't wanna screw anything up.
Before you do any of the following, please uninstall all drivers and all overclocking software, then do a clean reinstall.
First of all, never ever ever ever use unofficial overclocking. I tried that like you and it killed my performance and gave me artifacts as well. you need to do all of your overclocking of frequencies in the CCC, and your overvolting in MSI AB. Don't touch any other settings except the voltage in MSI AB. If you were like me, and didn't like CCC limiting the frequencies to 1125 and 1525 (i think), perform the /xcl command with an msi ab shortcut. If you have no idea what I'm talking about, google "msi afterburner xcl command". After doing this, you'll need to restart your system. Now open up your CCC and you should be able to raise your gpu and ram much higher than before. Don't make any super huge increases at once, and only raise one frequency at a time (don't make changes to gpu and vram at the same time). This eliminates as many variables as possible that could be causing artifacting. I would recommend starting @ 1000/1400. Keep raising your gpu OR vram (i recommend starting out with the gpu) while running a strong benchmark, waiting AT LEAST 60 seconds between changes before making new ones. Don't make huge changes (maybe 5-15 mhz at once). Keep doing this until either you notice stability/fps decreasing, or artifacting. Once either starts to occur, close your benchmark immediately and go to your MSI AB to raise the voltage, then restart your benchmark. Make sure to keep your benchmark running while making frequency changes so that you know the exact frequency that causes instability. I can't really give advice on where your voltage should be, but i recommend an increase of .025 once you notice instability/artifacting. My voltage is right at 1.275. Once you've got your gpu where you want it, run a 10-15 minute STRONG benchmark to ensure stability and reasonable temperatures. For vram, basically the same thing, though raising the ram frequency might not ever cause artifacts, it may just cause a complete system lockup, so make sure to make small changes to that as well. Remember that having vram too high can lower your fps. It may sound like a crapshoot, but it should work fine in the end. If you have any questions just PM me. I've spent a LOT of time figuring this out and am very satisfied with both of my 7970's in crossfire @ 1235/1700. Furmark score: http://www.ozone3d.net/benchmarks/furmark_192_score.php?id=104644
EDIT: When checking your frequencies for temperature stability, i highly recommend running the benchmark until your gpu temperatures stop raising altogether. Mine stop raising @ around 68/69 c with fans @ 80%.Edited by xjxason - 1/8/13 at 9:48am