Radeon HD 5870 vs Radeon HD 6750 1GB

Intro

Compare those specifications to the Radeon HD 6750 1GB, which uses a 40 nm design. AMD has set the core frequency at 725 MHz. The GDDR5 memory works at a speed of 1000 MHz on this card. It features 720 SPUs as well as 36 Texture Address Units and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6750 1GB		86 Watts
Radeon HD 5870		188 Watts
	Difference: 102 Watts (119%)

Memory Bandwidth

In theory, the Radeon HD 5870 should perform much faster than the Radeon HD 6750 1GB overall. (explain)

Radeon HD 5870		153600 MB/sec
Radeon HD 6750 1GB		64000 MB/sec
	Difference: 89600 (140%)

Texel Rate

The Radeon HD 5870 will be much (about 161%) more effective at anisotropic filtering than the Radeon HD 6750 1GB. (explain)

Radeon HD 5870		68000 Mtexels/sec
Radeon HD 6750 1GB		26100 Mtexels/sec
	Difference: 41900 (161%)

Pixel Rate

If running with lots of anti-aliasing is important to you, then the Radeon HD 5870 is the winner, by a large margin. (explain)

Radeon HD 5870		27200 Mpixels/sec
Radeon HD 6750 1GB		11600 Mpixels/sec
	Difference: 15600 (134%)

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 largest amount of information (measured in MB per second) that can be moved over the external memory interface in one second. It is calculated by multiplying the card's interface width by its memory clock speed. If it uses DDR memory, the result should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are processed in one second. This number is calculated by multiplying the total texture units by the core clock speed of the chip. The better this number, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip can possibly write to its local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the amount of ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate is also dependant on many other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.