The two graphics cards that I have in my system are: Asus Platinum HD7970 Matrix 1100/1650 3GB - Stock core voltage of 1257mv XFX Radeon HD7970 925/1375 3GB - Stock core voltage of 1170mv Other system specs: i7 3770k OC @ 4.7Ghz (Confirmed stable) 32Gb DDR3 RAM 2400Mhz 128GB Samsung 840 Pro SSD 1TB Caviar Black WD HDD Asus Maximus V Formula eATX Motherboard My drivers are up to date and my temps during the tests are normal. I decided that I was going to see how far i could push my GPU's on stock voltage. I started with the XFX card and was able to reach 1100/1525 at stock voltage. To confirm stability I ran and monitored a 10 minute Furmark 1080P Burn-in test and saw no problems at all. I then moved on to the Asus card. I started with the memory and was able to clock it at 1750 with no issues. When I started with something i deemed reasonable; 1200Mhz. The second I opened Furmark it crashed. I had to lower the core clock to 1170Mhz before I could even open Furmark. When I ran a Burn-in test I immediately got artifacts. I continued to drop the core clock and yet continued to get artifacts until I reached 1155Mhz. So I said "OK" and decided to try and push 1155Mhz with an increased voltage. No matter how high I increased the voltage the clock was not stable >1155. I've spent several hours doing research and trying to find the right combination of the two and have had no success. If anyone has any suggestions on how I may be able to push 1155Mhz, I would really appreciate it.