Compare any two graphics cards:
GeForce GT 420 vs Radeon HD 6670 (OEM) 1GB
IntroThe GeForce GT 420 has a GPU core clock speed of 700 MHz, and the 2048 MB of GDDR3 RAM is set to run at 900 MHz through a 128-bit bus. It also is made up of 48 SPUs, 8 TAUs, and 4 Raster Operation Units.
Compare those specifications to the Radeon HD 6670 (OEM) 1GB, which makes use of a 40 nm design. AMD has set the core speed at 800 MHz. The GDDR5 RAM works at a frequency of 1000 MHz on this specific card. It features 480 SPUs along with 24 Texture Address Units and 8 Rasterization Operator Units.
(No game benchmarks for this combination yet.)
Power Usage and Theoretical Benchmarks
Power Consumption (Max TDP)
Theoretically speaking, the Radeon HD 6670 (OEM) 1GB will be 122% faster than the GeForce GT 420 overall, because of its greater bandwidth. (explain)
Texel RateThe Radeon HD 6670 (OEM) 1GB should be quite a bit (approximately 243%) better at anisotropic filtering than the GeForce GT 420. (explain)
Pixel RateIf running with a high screen resolution is important to you, then the Radeon HD 6670 (OEM) 1GB is the winner, 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 largest amount of information (counted in megabytes per second) that can be transferred over the external memory interface in one second. It's worked out by multiplying the card's interface width by the speed of its memory. If the card has DDR type memory, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.
Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be applied per second. This figure is worked out by multiplying the total texture units by the core speed of the chip. The better the texel rate, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in one second.
Pixel Rate: Pixel rate is the maximum amount of pixels the video card can possibly write to the local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of Raster Operations Pipelines by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate also depends on lots of other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.