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Overclocking And Performance

Gigabyte Radeon HD 7970 Super Overclock: Now With Windforce 5X
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We wanted to figure out just how far the Radeon HD 7970 Super Overclock's Windforce 5X cooling solution would let us overclock AMD's Tahiti GPU.

Our GPU achieves an ASIC score of 66.7 in GPU-Z, which isn't very good. But we managed to overclock it well anyway. Using 1.25 V, we managed to hit 1250 MHz. At 1.3 V, that number increased to 1300 MHz. Both values are stable for long-term gaming and under our stress tests. The memory was stable up to about 1500 MHz. We started running into problems (including lock-ups) at 1550 MHz.

If you push your GPU to 1.3 V, then you really want to retain the card's default fan speed profile. Our custom configuration resulted in temperatures as high as 90 degrees Celsius. We discovered that our noise-optimized profile does work well at 1.25 V or less, though.

Performance Benchmarks

We’ve already spent plenty of time benchmarking AMD's Tahiti GPU, so we didn't need to run many tests to know where Gigabyte's Super Overclock card places. Really, it's only necessary to see where the stock 1080 MHz clock rate lands, along with the overclocked frequency of 1250 MHz.

Once you exceed about 1100 MHz, overclocking yields diminishing returns. Performance continues to increase at higher clock rates, but the ratio between faster frame rates and power consumption drops, negating the reason to push any higher.

It makes sense that Gigabyte's Radeon HD 7970 Super Overclock has a stock GPU clock of 1080 MHz. The one reason to push up to 1250 or 1300 MHz is benchmark bragging rights. But the speed-up won't make much difference in real-world gaming.

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  • 1 Hide
    whatsthatnoise , 7 August 2012 00:03
    Noise fail, as it was to be expected since the first picture of the card was released. The design might be a good idea in theory, but it's doomed because of those 40mm fans.
  • 0 Hide
    tulx , 7 August 2012 22:55
    whatsthatnoiseNoise fail, as it was to be expected since the first picture of the card was released. The design might be a good idea in theory, but it's doomed because of those 40mm fans.


    "happy to report that our initial fears of ghastly acoustics were unfounded"
  • 0 Hide
    Jony93 , 12 August 2012 19:06
    Uau,new design!Awsome,I like this Ideea...but would be nice if the noise would be not so big.