NVIDIA GeForce GTX 480 and GTX 470 Review - GF100 and Fermi tackle gaming
The GeForce GTX 480 1.5GB Graphics Card
A full, complete GPC
Also, because the texture units are directly associated with the SMs at four per unit, the total texture unit count has dropped from 64 to 60. We have already predicted that the texture performance of the GF100 GPU would be lower than that of the Evergreen GPU from AMD, though NVIDIA claims it is much more efficient than the GT200 implementation, so we'll have to see how this slight drop in texturing power affects gaming performance.
The ROP count remains the same as we were originally indicated though at 48 so AA performance should not be affected.
The GTX 480 continues with the same three individualized clock rates that the GT200 had: 700 MHz core clock, 1401 MHz shader clock and a 924 MHz GDDR5 memory clock (effective 3.7 GHz). The GDDR5 frame buffer sits at 1.5 GB and does use the full 384-bit memory bus for a total memory bandwidth of 177.4 GB/s. This does best the Radeon HD 5870s 153 GB/s of memory bandwidth that runs on a 256-bit memory bus.
With the lower texture unit count, the GTX 480 is limited to about 42 GigaTexels/s of texture filtering power while the Radeon HD 5870 gets as much as 68 GigaTexels/s. Obvious there are some texturing performance differences to be had between the two architectures the question is whether or not that will show itself in gaming environments.
We were never provided estimated clock speeds on the Fermi architecture so I can't say whether NVIDIA has lowered these or if they are where the company expected them to be. Many rumor stories are claiming that NVIDIA also had to pull back on them, but we may never know for sure.
Power estimates (from NVIDIA) put the GTX 480 as a 250 watt graphics card with a GPU thermal threshold of 105C - I can vouch for that as our samples were often running at 95C in a typical gaming environment.
a part of the heatsink design.
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