Ahead of every major GPU launch, both NVIDIA and AMD give out a document
to reviewers known as Reviewer's Guide, in which both provide
guidelines (suggestions, not instructions), to reviewers to ensure new
GPUs are given a fair testing. In such documents, the two often also
give out their own performance expectations from the GPUs they're
launching, in which they compare the new GPUs to either
previous-generation GPUs from their own brand, or from the competitors'.
Apparently such a performance comparison between the upcoming Radeon HD
7970 and NVIDIA's GeForce GTX 580, probably part of such a document,
got leaked to the internet, which 3DCenter.org re-posted. The first
picture below, is a blurry screenshot of a graph in which the two GPUs
are compared along a variety of tests, at a resolution of 2560 x 1600. A
Tweakers.net community member recreated that graph in Excel, using that
data (second picture below).
A couple of things here are worth noting. Reviewer guide performance
numbers are almost always exaggerated, so if reviewers get performance
results lower than 'normal', they find it abnormal, and re-test. It's an
established practice both GPUs vendors follow. Next, AMD Radeon GPUs
are traditionally good at 2560 x 1600. For that matter, the performance
gap between even the Radeon HD 6970 and GeForce GTX 580 narrows a bit at
that resolution.
Source: 3DCenter.org
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