Compare any two graphics cards:
GeForce GT 130 vs Radeon HD 4550 256MB
IntroThe GeForce GT 130 has a core clock speed of 500 MHz and a DDR2 memory speed of 250 MHz. It also uses a 192-bit bus, and makes use of a 55 nm design. It is comprised of 48 SPUs, 24 TAUs, and 16 ROPs.
Compare those specs to the Radeon HD 4550 256MB, which comes with a GPU core clock speed of 600 MHz, and 256 MB of DDR3 memory running at 800 MHz through a 64-bit bus. It also is made up of 80(16x5) Stream Processors, 8 Texture Address Units, and 4 ROPs.
Power Usage and Theoretical Benchmarks
Power Consumption (Max TDP)
Theoretically speaking, the Radeon HD 4550 256MB should be 7% quicker than the GeForce GT 130 overall, due to its greater data rate. (explain)
Texel RateThe GeForce GT 130 should be quite a bit (more or less 150%) more effective at AF than the Radeon HD 4550 256MB. (explain)
Pixel RateThe GeForce GT 130 is quite a bit (approximately 233%) faster with regards to anti-aliasing than the Radeon HD 4550 256MB, and will be capable of handling higher screen resolutions more effectively. (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 information (in units of megabytes per second) that can be transported over the external memory interface in one second. The number is worked out by multiplying the card's interface width by its memory speed. In the case of DDR RAM, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and higher screen resolutions.
Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be processed in one second. This number is calculated by multiplying the total number of texture units by the core clock speed of the chip. The higher the texel rate, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.
Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip can possibly write to the local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate is also dependant on quite a few other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.