HIS Radeon HD 5850 Turbo Review
AMD Phenom II X4 965 Black Edition
Asus ROG Crossfire IV Formula Motherboard
4GB Corsair XMS3 PC3-12800 RAM
HIS Radeon HD 5850 1GB GDDR5 Graphics Card
Samsung Spinpoint F1 320GB SATA II Hard Disk Drive
Samsung 22x DVD+/-RW SATA
Arctic Freezer 64 Pro CPU Cooler
BeQuiet! Dark Power 750W 80PLUS PSU
Windows 7 Home Premium x64
As you can imagine, temperature should be a major strength for this Radeon HD 5850. After 30 minutes of idle testing we ran the Furmark stability test to ascertain the maximum core temperature of the graphics card. The test was undertaken with both automatic fan control and a fixed duty speed of 50%.
First of all, I'd like to point out how impressive these results are. After an extensive period of GPU load, the GPU had peaked at a consistent 64c without breaking a sweat. More to the point, the fan operated no faster than 45% of it's maximum rotation speed. Manually increasing the fan speed to 50% allowed for a 5c improvement in temperatures however a more noticeable motor noise was observed.
We were pleasantly surprised by the HD 5850's maximum core frequency. Slowly but steadily we were able to reach a frequency of 965MHz before it locked up in true checkerboard fashion. After some rolling back and stability testing we eventually found ourselves with a maximum stable frequency of 942MHz.
Our memory overclock was less impressive... Failure was achieved at a paltry 1175MHz and occasional memory related artifacts were observed at 1150MHz. Hence, our maximum stable memory frequency stands at it's nominal frequency of 1125MHz.