Compare any two graphics cards:
GeForce GTX 660 vs Radeon HD 5770
IntroThe GeForce GTX 660 uses a 28 nm design. nVidia has clocked the core speed at 980 MHz. The GDDR5 RAM runs at a frequency of 1502 MHz on this specific card. It features 960 SPUs as well as 80 TAUs and 24 ROPs.
Compare all that to the Radeon HD 5770, which has a core clock frequency of 850 MHz and a GDDR5 memory frequency of 1200 MHz. It also features a 128-bit memory bus, and makes use of a 40 nm design. It features 800(160x5) SPUs, 40 TAUs, and 16 Raster Operation Units.
Power Usage and Theoretical Benchmarks
Power Consumption (Max TDP)
In theory, the GeForce GTX 660 is 88% faster than the Radeon HD 5770 in general, due to its higher bandwidth. (explain)
Texel RateThe GeForce GTX 660 will be a lot (approximately 131%) faster with regards to AF than the Radeon HD 5770. (explain)
Pixel RateIf using a high resolution is important to you, then the GeForce GTX 660 is a better choice, and very much so. (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 max amount of data (measured in megabytes per second) that can be moved across the external memory interface within a second. It is worked out by multiplying the card's interface width by the speed of its memory. In the case of DDR RAM, it must be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.
Texel Rate: Texel rate is the maximum texture map elements (texels) that are applied per second. This figure is worked out by multiplying the total number of texture units by the core speed of the chip. The higher this number, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed 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. Pixel rate is worked out by multiplying the number of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate is also dependant on lots of other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.