Compare any two graphics cards:
GeForce GT 420 vs Radeon HD 6670 (OEM) 1GB
IntroThe GeForce GT 420 features a GPU clock speed of 700 MHz, and the 2048 MB of GDDR3 memory runs at 900 MHz through a 128-bit bus. It also is comprised of 48 Stream Processors, 8 TAUs, and 4 Raster Operation Units.
Compare that to the Radeon HD 6670 (OEM) 1GB, which makes use of a 40 nm design. AMD has set the core frequency at 800 MHz. The GDDR5 RAM runs at a frequency of 1000 MHz on this specific model. It features 480 SPUs along with 24 Texture Address Units and 8 Rasterization Operator Units.
Power Usage and Theoretical Benchmarks
Power Consumption (Max TDP)
As far as performance goes, the Radeon HD 6670 (OEM) 1GB should theoretically be much better than the GeForce GT 420 overall. (explain)
Texel RateThe Radeon HD 6670 (OEM) 1GB is much (approximately 243%) faster with regards to anisotropic filtering than the GeForce GT 420. (explain)
Pixel RateThe Radeon HD 6670 (OEM) 1GB should be a lot (approximately 129%) more effective at full screen anti-aliasing than the GeForce GT 420, and will be capable of handling higher resolutions without slowing down too much. (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 over the external memory interface in a second. It is calculated by multiplying the bus width by the speed of its memory. If the card has DDR RAM, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the card's memory bandwidth, the better 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 are processed in one second. This number is calculated by multiplying the total amount of texture units of the card 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 in one second.
Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card can possibly write to the local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of Render Output Units 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 rate is also dependant on many other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.