Compare any two graphics cards:
GeForce GTS 450 1GB vs Radeon HD 4770
IntroThe GeForce GTS 450 1GB comes with a core clock speed of 783 MHz and a GDDR5 memory speed of 902 MHz. It also makes use of a 128-bit bus, and uses a 40 nm design. It is made up of 192 SPUs, 32 TAUs, and 16 ROPs.
Compare all that to the Radeon HD 4770, which has GPU clock speed of 750 MHz, and 512 MB of GDDR5 RAM set to run at 800 MHz through a 128-bit bus. It also is made up of 640(128x5) SPUs, 32 Texture Address Units, and 16 ROPs.
(No game benchmarks for this combination yet.)
Power Usage and Theoretical Benchmarks
Power Consumption (Max TDP)
The GeForce GTS 450 1GB should in theory be a small bit faster than the Radeon HD 4770 overall. (explain)
Texel RateThe GeForce GTS 450 1GB should be a little bit (about 4%) more effective at anisotropic filtering than the Radeon HD 4770. (explain)
Pixel RateThe GeForce GTS 450 1GB should be just a bit (more or less 4%) faster with regards to AA than the Radeon HD 4770, and should be able to handle higher 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 max amount of information (counted in megabytes per second) that can be moved across the external memory interface in a second. It is calculated by multiplying the card's interface width by its memory speed. If the card has DDR memory, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the faster 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 amount of texture map elements (texels) that can be processed per second. This is calculated by multiplying the total texture units by the core clock speed of the chip. The better this number, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.
Pixel Rate: Pixel rate is the maximum amount of pixels the video 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 output rate also depends on lots of other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.