Compare any two graphics cards:
Radeon HD 5450 vs Radeon HD 6450 (OEM) 1GB
IntroThe Radeon HD 5450 has a clock speed of 650 MHz and a DDR3 memory frequency of 800 MHz. It also features a 64-bit memory bus, and makes use of a 40 nm design. It is comprised of 80(16x5) SPUs, 8 TAUs, and 4 ROPs.
Compare all of that to the Radeon HD 6450 (OEM) 1GB, which comes with a clock speed of 750 MHz and a GDDR5 memory speed of 900 MHz. It also uses a 64-bit bus, and uses a 40 nm design. It features 160 SPUs, 8 Texture Address Units, and 4 Raster Operation Units.
Power Usage and Theoretical Benchmarks
Power Consumption (Max TDP)
The Radeon HD 6450 (OEM) 1GB should theoretically perform quite a bit faster than the Radeon HD 5450 overall. (explain)
Texel RateThe Radeon HD 6450 (OEM) 1GB should be a little bit (more or less 15%) more effective at AF than the Radeon HD 5450. (explain)
Pixel RateIf using lots of anti-aliasing is important to you, then the Radeon HD 6450 (OEM) 1GB is the winner, though not by far. (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: Bandwidth is the maximum amount of information (measured in megabytes per second) that can be transferred over the external memory interface in a second. It is calculated by multiplying the interface width by its memory clock speed. If the card has DDR RAM, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.
Texel Rate: Texel rate is the maximum texture map elements (texels) that are applied in one second. This number is worked out by multiplying the total amount of texture units of the card by the core clock speed of the chip. The higher the texel rate, the better the graphics 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 most pixels the graphics card can possibly record to the local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on quite a few other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the max fill rate.