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Old 01-22-12, 08:37 PM   #111
ninelven
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Join Date: Jan 2003
Posts: 132
Default Re: next gen kepler to support dx 11.1, also take a year to rollout all cards

Quote:
Originally Posted by shadow001
What's wrong with this picture when you know that Fermi has 50% more rops than the HD6970 and HD 7970( both have only 32)
Although Fermi has 48 ROPs, it can only put out 2 pixels per SM per clock, which equals 32 (16 SM x 2 = 32PPC). The stock clock of the GTX 580 is 772 vs 925 for the 7970, which makes the 7970 20% faster. The 7970 also has a 37% bandwidth advantage over the GTX 580. Looking at the numbers from your first graph 13.33 / 9.75 = 1.37 or a 37% advantage for the 7970 indicating that bandwidth is the limiting factor and exactly what one would expect.
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