Compare any two graphics cards:
Radeon HD 4650 1GB vs Radeon HD 4670 1GB
IntroThe Radeon HD 4650 1GB makes use of a 55 nm design. AMD has clocked the core frequency at 600 MHz. The GDDR3 memory is set to run at a speed of 700 MHz on this particular card. It features 320(64x5) SPUs along with 32 TAUs and 8 Rasterization Operator Units.
Compare all that to the Radeon HD 4670 1GB, which makes use of a 55 nm design. AMD has clocked the core speed at 750 MHz. The GDDR4/GDDR3/DDR3/DDR2 memory runs at a frequency of 1100 MHz on this specific model. It features 320(64x5) SPUs as well as 32 TAUs and 8 ROPs.
Power Usage and Theoretical Benchmarks
Power Consumption (Max TDP)
Theoretically speaking, the Radeon HD 4670 1GB will be 57% faster than the Radeon HD 4650 1GB overall, due to its higher bandwidth. (explain)
Texel RateThe Radeon HD 4670 1GB will be quite a bit (approximately 25%) faster with regards to anisotropic filtering than the Radeon HD 4650 1GB. (explain)
Pixel RateIf using a high resolution is important to you, then the Radeon HD 4670 1GB is a better choice, 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 max amount of information (in units of megabytes per second) that can be transported past the external memory interface in one second. The number is worked out by multiplying the interface width by its memory clock speed. In the case of DDR type RAM, the result should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.
Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are processed per second. This is worked out by multiplying the total number of texture units by the core speed of the chip. The higher the texel rate, the better the 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 the video card can possibly write to its local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of Render Output Units by the clock speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate also depends on quite a few other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.