Powercolor LCS HD 6990 4GB Reviewccokeman -
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Temperature testing will be accomplished by loading the video card to 100% using Crysis Warhead with MSI's Afterburner overclocking utility for temperature monitoring. I will be using a resolution of 1920x1200 using 8xAA. I will use a 10-run sequence to run the test, ensuring that the maximum thermal threshold is reached. The fan speed will be left in the control of the driver package and video card's BIOS for the stock load test, with the fan moved to 100% to see the best possible cooling scenario for the overclocked load test. The idle test will be a 20-minute cool down with the fan speeds left on automatic in the stock speed testing and bumped up to 100% when running the overclocked idle and load testing.
- Monitoring with MSI Afterburner
- Crysis Warhead 1920x1200 8xAA
- 10-run sequence
- 20-minute idle duration
- Temperature measured in degrees Celsius
Lower = Better
At idle, the PowerColor HD 6990 LCS is not the coolest running card in the group, as it is constrained by the temperature of the entire liquid cooling loop. What it does not deliver at idle, it more than makes up for when a load is applied to the two GPUs. At 880MHz (compared to the reference 830MHz), the difference in temperatures over the reference air-cooled card is an amazing 37 degrees Celsius. The overclocked results are not quite as dramatic at 21 °C. Not the same big number as the stock results, but still a major improvement. If the reference card had the fan speed reduced to eliminate the noise, the delta would surely increase between the two cards.