![]() In our Dirt 3 test, which we run at 1,920x1,080 with 4x anti-aliasing and Ultra detail, the HD 7970 GHz Edition managed 104.3fps, up from 88fps with the standard HD 7970. We first tested the card with AMD's current release driver, which at the time of writing was version 12.4. However, we were surprised by how much of a difference the tweaks made to the AMD card's performance. This isn’t the first card we've seen which can dynamically boost its clock speed the Nvidia GeForce GTX 680 can boost from 1.01GHz to 1.58GHz if there's enough power and thermal capacity. The card can also vary the GPU's voltage to help it manage boost speeds more effectively. ![]() The new HD 7970 GHz Edition has an increased clock speed, up from 925MHz to 1GHz, and can boost dynamically up to 1.05GHz when the thermal envelope allows it. There are a couple of big differences, though.
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