Radeon HD 5750 512MB vs Radeon HD 6870

Intro

Compare that to the Radeon HD 6870, which features a clock speed of 900 MHz and a GDDR5 memory speed of 1050 MHz. It also uses a 256-bit bus, and makes use of a 40 nm design. It is made up of 1120 SPUs, 56 Texture Address Units, and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 5750 512MB		86 Watts
Radeon HD 6870		151 Watts
	Difference: 65 Watts (76%)

Memory Bandwidth

In theory, the Radeon HD 6870 is 83% faster than the Radeon HD 5750 512MB in general, because of its higher bandwidth. (explain)

Radeon HD 6870		134400 MB/sec
Radeon HD 5750 512MB		73600 MB/sec
	Difference: 60800 (83%)

Texel Rate

The Radeon HD 6870 is much (more or less 100%) more effective at anisotropic filtering than the Radeon HD 5750 512MB. (explain)

Radeon HD 6870		50400 Mtexels/sec
Radeon HD 5750 512MB		25200 Mtexels/sec
	Difference: 25200 (100%)

Pixel Rate

If running with a high screen resolution is important to you, then the Radeon HD 6870 is the winner, by a large margin. (explain)

Radeon HD 6870		28800 Mpixels/sec
Radeon HD 5750 512MB		11200 Mpixels/sec
	Difference: 17600 (157%)

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 Comparison

Specifications

Memory Bandwidth: Bandwidth is the maximum amount of data (counted in MB per second) that can be moved across the external memory interface within a second. The number is calculated by multiplying the interface width by the speed of its memory. If it uses DDR memory, it must be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be applied per second. This figure is calculated by multiplying the total amount of texture units by the core clock speed of the chip. The higher the texel rate, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in a second.

Pixel Rate: Pixel rate is the most pixels the graphics card could possibly write to its local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the number of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate is also dependant on quite a few other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.