Compare any two graphics cards:
GeForce GTX 460 vs GeForce GTX 660
IntroThe GeForce GTX 460 uses a 40 nm design. nVidia has clocked the core frequency at 675 MHz. The GDDR5 memory works at a frequency of 900 MHz on this particular card. It features 336 SPUs along with 56 Texture Address Units and 24 ROPs.
Compare those specifications to the GeForce GTX 660, which features GPU clock speed of 980 MHz, and 2048 MB of GDDR5 memory running at 1502 MHz through a 192-bit bus. It also is comprised of 960 SPUs, 80 Texture Address Units, and 24 ROPs.
(No game benchmarks for this combination yet.)
Power Usage and Theoretical Benchmarks
Power Consumption (Max TDP)
The GeForce GTX 660 should theoretically perform much faster than the GeForce GTX 460 overall. (explain)
Texel RateThe GeForce GTX 660 is a lot (about 107%) faster with regards to anisotropic filtering than the GeForce GTX 460. (explain)
Pixel RateThe GeForce GTX 660 should be quite a bit (approximately 45%) faster with regards to FSAA than the GeForce GTX 460, and capable of handling higher screen resolutions without slowing down too much. (explain)
Please note that the above 'benchmarks' are all just theoretical - the results were calculated based on the card's specifications, and real-world performance may (and probably will) vary at least a bit.
Please note that the price comparisons are based on search keywords - sometimes it might show cards with very similar names that are not exactly the same as the one chosen in the comparison. We do try to filter out the wrong results as best we can, though.
Memory Bandwidth: Memory bandwidth is the largest amount of data (in units of megabytes per second) that can be transported across the external memory interface in a second. It is worked out by multiplying the card's interface width by its memory clock speed. In the case of DDR RAM, it should be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.
Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed per second. This number is worked out by multiplying the total texture units of the card by the core clock speed of the chip. The better this number, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.
Pixel Rate: Pixel rate is the most pixels the graphics card can possibly record to its local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the number of Raster Operations Pipelines by the the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate also depends on lots of other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.