Compare any two graphics cards:
Radeon HD 4890 1GB vs Radeon HD 6850
IntroThe Radeon HD 4890 1GB uses a 55 nm design. ATi has clocked the core speed at 1000 MHz. The GDDR5 RAM runs at a frequency of 975 MHz on this card. It features 800(160x5) SPUs as well as 40 TAUs and 16 ROPs.
Compare those specifications to the Radeon HD 6850, which makes use of a 40 nm design. ATi has clocked the core frequency at 775 MHz. The GDDR5 memory works at a frequency of 1000 MHz on this particular card. It features 960 SPUs along with 48 Texture Address Units and 32 Rasterization Operator Units.
(No game benchmarks for this combination yet.)
Power Usage and Theoretical Benchmarks
Power Consumption (Max TDP)
Theoretically speaking, the Radeon HD 6850 is 3% faster than the Radeon HD 4890 1GB overall, because of its greater bandwidth. (explain)
Texel RateThe Radeon HD 4890 1GB will be a little bit (more or less 8%) better at texture filtering than the Radeon HD 6850. (explain)
Pixel RateThe Radeon HD 6850 will be a lot (about 55%) faster with regards to full screen anti-aliasing than the Radeon HD 4890 1GB, and should be able to handle higher screen resolutions without losing too much performance. (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.
Price ComparisonPlease note that the price comparisons are based on search keywords, and might not be the exact same card listed on this page. We have no control over the accuracy of their search results.
Memory Bandwidth: Memory bandwidth is the maximum amount of information (measured in megabytes per second) that can be transported past the external memory interface in one second. It is worked out by multiplying the interface width by its memory clock speed. If it uses DDR type RAM, the result should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the better 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 texture map elements (texels) that are processed per second. This is calculated by multiplying the total number of texture units of the card by the core speed of the chip. The higher this number, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.
Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip could possibly record to its local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the amount of ROPs by the the core 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 is also dependant on lots of other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.