|XFX Radeon R7950 Black Edition Video Card|
|Reviews - Featured Reviews: Video Cards|
|Written by David Ramsey|
|Monday, 30 January 2012|
Page 16 of 18
XFX R7950 DD Overclocking
The XFX R7950 Black Edition Double Dissipation video card comes pre-overclocked. While the stock Radeon 7950 runs its GPU at 800MHz, out of the box the XFX card is running at 900MHz. But maybe there's more to be had. I first tried overclocking with a beta version of MSI's Afterburner utility, but wasn't able to get things working correctly (especially the voltage adjustments), so I was limited to AMD's own Overdrive utility, built into the Catalyst Control Center.
While I was able to take XFX's R7970 GPU as far as Overdrive would take it (1100MHz), I could only reach 1020MHz on the R7950. Actually, 1050MHz would work on every benchmark except Crysis 2, where it would reliably lock up just a few seconds into the benchmark, every time...and since it was the last benchmark in my tests, I had to re-run everything at 1020MHz. I was able to overclock the memory the full additional 200MHz that Overdrive allowed, to 1575MHz. A 13.3% overclock might not seem like much, but remember XFX has already taken the GPU from its stock 800MHz clock to 900MHz, so 1020MHz represents a 27.5% overclock from the "real" stock setting.
The card was completely stable at these settings, and the fans didn't seem any louder except under FurMark testing. Here's how the overclock helped performance at 1920x1200:
As you can see from the charts, when overclocked, the R7950 comes very close to the performance of the R7970.