Radeon HD 5870 vs Radeon HD 7750

Intro

Compare all that to the Radeon HD 7750, which comes with clock speeds of 800 MHz on the GPU, and 1125 MHz on the 1024 MB of GDDR5 memory. It features 512 SPUs along with 32 Texture Address Units and 16 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7750		55 Watts
Radeon HD 5870		188 Watts
	Difference: 133 Watts (242%)

Memory Bandwidth

The Radeon HD 5870, in theory, should perform much faster than the Radeon HD 7750 in general. (explain)

Radeon HD 5870		153600 MB/sec
Radeon HD 7750		72000 MB/sec
	Difference: 81600 (113%)

Texel Rate

The Radeon HD 5870 should be quite a bit (more or less 166%) more effective at anisotropic filtering than the Radeon HD 7750. (explain)

Radeon HD 5870		68000 Mtexels/sec
Radeon HD 7750		25600 Mtexels/sec
	Difference: 42400 (166%)

Pixel Rate

If running with a high resolution is important to you, then the Radeon HD 5870 is superior to the Radeon HD 7750, by a large margin. (explain)

Radeon HD 5870		27200 Mpixels/sec
Radeon HD 7750		12800 Mpixels/sec
	Difference: 14400 (113%)

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: Memory bandwidth is the maximum amount of data (counted in megabytes per second) that can be moved past the external memory interface within a second. The number is calculated by multiplying the interface width by its memory clock speed. In the case of DDR RAM, it should be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the 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 per 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 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 maximum number of pixels that the graphics card could possibly record to the local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of Raster Operations Pipelines by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate is also dependant on many other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.