Which of the Geek3D's GPU tests are you running? Furmark?
In Windows, use TechPowerUp GPU-Z. It will allow you to monitor the sensors on your graphics card (Clock speeds, temp, fan speed, load, memory usage, power usage). There is also HWMonitor for Windows that displays this sensor data...
Thanks for this. I have GPU-Z now.
I have since flashed the bios of my card with a better bios, and it looks like it was indeed a driver issue in Windows causing the crashing. I completely removed all previous drivers and now it has run for nearly a week without crashing.
I ran the GPU at 100% for 12 hours straight, several days in a row, monitoring it to test stability. So far no problems.
The max wattage this card has pulled is 182w. This is from 2 x PCIe (1 @ 84w, 1 @ 64w) booster slots and only 33w from the PCIe slot.
However when running with 2 x Sata's to an 8 Pin, the power draw is totalling around 165w (1 booster @ 68w, 33 from the PCIe, 64 from 2 x Sata's).
Why? I'm not sure. Furmark more or less the same, but actually 200 points higher test scores with 2 x Satas running 18w shorter overall.
