AMD Radeon HD 7870 & HD 7850 Review

Author: SKYMTL
Date: March 3, 2012
Product Name: Radeon HD 7870 & HD 7850
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Overclocking Results

Overclocking has quickly become a standard practice for anyone that owns an HD 7000-series GPU for a number of reasons. First and foremost among these is the willingness of the cards to reach high frequencies with very little effort and the resulting performance increase can vault even a lowly HD 7770 into a whole new market segment.

To attain the results below, we overclocked using AMD’s Overdrive utility with the default fan speed profile enabled and the PowerTune limit set to +20. Voltages were kept to their reference levels as well. Also take note that if an overclock could not complete our entire test suite (benchmark sequences of every game listed in this review, at every resolution) equaling roughly 2 hours of game time, it was not included in the results below. As such, we are confident that our final clock speeds are entirely stable for gaming purposes.

HD 7870 Results

AMD’s Catalyst Control Center includes some generous core and memory limits for the HD 7870 but without any voltage adjustments, we weren’t able to max either of them. Nonetheless, it hit a core speed of 1196MHz while the memory hit a blistering speed of 5204MHz before the GDDR5’s error correction routines began throttling performance. All in all this is an excellent result and as you will see below, in game performance really was something to behold for a $349 card.

HD 7850 Results

AMD has instituted some strict limits for how far the HD 7850’s core can overclock but once again we weren’t able to attain anything close to 1050MHz. Instead, our card topped out at 1002MHz but the memory fared much better with a top speed of 5228MHz, one upping the HD 7870’s overclock by a few points.


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