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ROPs

Nvidia GeForce GTX 260/280 Review
By , Florian Charpentier

As we’ve seen, the number of ROPs has increased, but they haven’t gained any new features. But admittedly, the G8x ROPs were already quite complete, with support for 16- and 32-bit floating-point frame buffers with blending and antialiasing; antialiasing up to 8x or 16x in CSAA mode; Z rendering that’s eight times faster; etc. Not much needed to be added. So Nvidia made a point of optimizing performance. For blending in RGBA8 frame buffers, the G8x/G9x saw their performance divided in half, with 12 pixels per cycle. With the GT200 that limitation has been eliminated, with the addition of a 512-bit bus – with a bandwidth of more than 140 GB/s, the new ROPs should make the new GeForce cards unbeatable for fill rates. Here are the results for Z pixel rate:

gtx 260 280

As for raw performance, the results are no disappointment, setting a new record: 75,537 Mpixels/s! Still that’s a disappointing score in that it’s only a fourfold, and not an eightfold increase in the base fill rate. For the 9800 GTX, we posted a value of 5.2 – it was a little better, but again it remained well below the theoretical level.

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