Radeon HD 5750 1GB vs Radeon HD 6870

Intro

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

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 5750 1GB		86 Watts
Radeon HD 6870		151 Watts
	Difference: 65 Watts (76%)

Memory Bandwidth

The Radeon HD 6870, in theory, should perform much faster than the Radeon HD 5750 1GB in general. (explain)

Radeon HD 6870		134400 MB/sec
Radeon HD 5750 1GB		73600 MB/sec
	Difference: 60800 (83%)

Texel Rate

The Radeon HD 6870 will be a lot (more or less 100%) more effective at anisotropic filtering than the Radeon HD 5750 1GB. (explain)

Radeon HD 6870		50400 Mtexels/sec
Radeon HD 5750 1GB		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 superior to the Radeon HD 5750 1GB, and very much so. (explain)

Radeon HD 6870		28800 Mpixels/sec
Radeon HD 5750 1GB		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: Memory bandwidth is the max amount of information (counted in megabytes per second) that can be transferred past the external memory interface within a second. It is worked out by multiplying the card's 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 memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be applied per second. This figure is worked out 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 graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

Pixel Rate: Pixel rate is the most pixels the video card can possibly write to its local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel 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 max fill rate.