My 4870 has CCC fan control. Screen shot?
Originally Posted by rico2001 ![]() Use ccc for clocks. For voltage: ATI HD 5970 Overvoltage Utility |
Originally Posted by Xelios ![]() Might be an obvious one, but did you click the little auto button over the right side of the fan control? It greys out of left on. Will have a green light if its on. |
Originally Posted by kow_ciller ![]() Also check to see if you can set a custom fan profile in the settings. You might want to go on the afterburner forums and see if they have a fix for it. |
Originally Posted by dopey ![]() auto button is grayed out, same as slider. I can set oc profiles, but nothing about any fans listed anywhere.. I don't see any drop down menus - where? |
Overclocking the Sapphire HD 5970 OC was a little more difficult than I imagined it would be. First, the Sapphire overvolting utility Redline did not recognize the card as a supported piece so I had to move on to another utility to work the voltages to get as much from the card as possible. I will be following up with Sapphire on this. By bumping the voltage up to the 1.16 volts supplied by the voltage utility I was able to get the 5870 OC up to 890MHz on the two Cypress cores and 1250MHz on the GDDR5 memory. Pretty decent increases across the board from a card that is power limited at this point. A couple of things I found out were that you need to go into the CCC and overclock both cores otherwise your performance will not be up to what it should be. This does however, open up the opportunity to tweak the most performance from each core. The second item I found was that after a failed overclock you need to reset the clock speeds to the factory defaults on both cores before trying any other benching because the voltage tools do not keep the voltage settings after the restart. 155MHz on the core and 250MHz on the memory are not too bad and beat the stock HD 5870 speeds. Peak load when overclocked came in at 486 watts with load temperatures peaking at 69 Celsius with the fan at 85%. Yes, it is loud just like almost every reference cooler since the 1900XTs. With only about eight hours of testing time I am not able to run the whole test suite but here is a taste of what the Sapphire HD 5970 OC has to offer. |