Compare any two graphics cards:
GeForce 9400 GT 256MB vs Radeon R9 M290X
IntroThe GeForce 9400 GT 256MB makes use of a 65 nm design. nVidia has set the core frequency at 550 MHz. The GDDR2 memory is set to run at a frequency of 400 MHz on this particular card. It features 16 SPUs as well as 8 Texture Address Units and 4 ROPs.
Compare those specs to the Radeon R9 M290X, which has GPU core speed of 850 MHz, and 4096 MB of GDDR5 memory set to run at 1200 MHz through a 256-bit bus. It also features 1280 SPUs, 80 Texture Address Units, and 32 Raster Operation Units.
Power Usage and Theoretical Benchmarks
Power Consumption (Max TDP)
The Radeon R9 M290X should theoretically be much faster than the GeForce 9400 GT 256MB in general. (explain)
Texel RateThe Radeon R9 M290X will be much (about 1445%) better at texture filtering than the GeForce 9400 GT 256MB. (explain)
Pixel RateThe Radeon R9 M290X should be quite a bit (more or less 1136%) faster with regards to FSAA than the GeForce 9400 GT 256MB, and should be capable of handling higher screen resolutions better. (explain)
Memory Bandwidth: Bandwidth is the largest amount of information (counted in MB per second) that can be moved across the external memory interface within a second. It's worked out by multiplying the bus width by the speed of its memory. If the card has DDR type memory, the result should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and high resolutions.
Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be processed per second. This figure is calculated by multiplying the total texture units by the core speed of the chip. The higher the texel rate, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.
Pixel Rate: Pixel rate is the most pixels the video card could possibly write to its local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the amount of Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on quite a few other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.