More evidence pointing to the existence of Nvidia's mysterious full-spec Fermi has just rolled up, with benchmarks apparently showing the difference made by the extra 32 stream processors.
As with the first glimpse of the card, the test results come from the tech hacks at Asian site Expreview, who claim to have put the elusive set of 512 stream processors through its paces in Crysis Warhead and 3DMark Vantage.
Of course, the site already posted a basic 3DMark Vantage score from the card last week, but this time it's provided a like-for-like comparison with a standard GeForce GTX 480 on the same test rig.
In this case, the site used as 2.6GHz Core i7 920 overclocked to 2.8GHz, along with 6GB of RAM as its test bed. Meanwhile, both cards had the same 701MHz GPU clock speed and 3,696MHz (effective) memory speed.
If the results are to be believed, then the full-spec Fermi card can clock up a GPU score of 10,072 in 3DMark Vantage's Extreme mode (1,920 x 1,200 with 4x anti-aliasing), compared with 9,521 from a standard GTX 480.
The site also notes that one primary difference between the two cards is the improved fill rate you get from 512 stream processors. According to the benchmark, the top-end Fermi card successfully knocked out 41.55GTexels/sec in the Texture Fill Feature test, compared with 38.82GTexels/sec on the standard card.
A similar performance-difference was also noted in Crysis Warhead. Running at the same resolution of 1,920 x 1,200, but with 8x anti-aliasing and the full Enthusiast DirectX 10 settings, the card with 512 stream processors produces a minimum frame rate of 26.66fps, and an average of 34.72fps. Comparatively, the standard card was just behind with a minimum of 24.44fps, and an average of 32.96fps.
However, while the performance difference looks minimal, getting above a minimum of 25fps is often considered the basic requirement for smooth frame rates. If these results are legit, then it looks as though a Fermi card with 512 stream processors can just about achieve this in Crysis Warhead at really high settings.
In short, with 512 stream processors at its disposal, a Fermi card can offer around a 5 per cent performance improvement over the standard GeForce GTX 480.