For avid overclockers, the stock cooler on your VGA doesn’t usually cut it.
Testing and results:
Furmark was used for testing due to its aggressiveness. Below is the setting used in Furmark:
Both MSI Afterburner and GPU-Z were used to measure the temperature of both GPU and VRMs. The Reference cooler fan was set on auto while the ACAX 5870 fans were set at max (2000 RPM). Below are the testing results:
The idle temps show an improvement by 14C on the GPU and 9C on the VRMs when using ACAX 5870 cooler. Though the important observation is during load that shows the best improvement on GPU temps which went down from 89C to a 52C- a decrease of 37C which is on par with what was written on the box! The VRMs though didn’t improve as much but still a considerable decrease from 90C to 72C, a difference of 18C.
As for noise levels, it is easy to keep the ACAX 5870 running at 100% fan speed since it is barely noticeable compared to when it is running at 20%. Either of these cases provide a much needed improvement over the stock HSF noise levels.
So what we have here is a great cooler and worthy replacement for the stock HSF of the ATI 5970 and 5870 cards. Its an obvious choice for those looking to improve their overclocking headroom or reduce the noise levels coming from the PC case.
We do wish that ramsinks were made part of the main cooler instead of separate units. A backplate to help spread heat and reduce bending the card due to its weight would have also been a nice addition. Though both are welcome improvements but far from mandatory.