Radeon HD 6750 1GB vs Radeon HD 7870 XT

Intro

Compare that to the Radeon HD 7870 XT, which features clock speeds of 925 MHz on the GPU, and 1500 MHz on the 2048 MB of GDDR5 RAM. It features 1536 SPUs as well as 96 TAUs and 32 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6750 1GB		86 Watts
Radeon HD 7870 XT		185 Watts
	Difference: 99 Watts (115%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 7870 XT should be quite a bit faster than the Radeon HD 6750 1GB overall. (explain)

Radeon HD 7870 XT		192000 MB/sec
Radeon HD 6750 1GB		64000 MB/sec
	Difference: 128000 (200%)

Texel Rate

The Radeon HD 7870 XT should be quite a bit (more or less 240%) faster with regards to anisotropic filtering than the Radeon HD 6750 1GB. (explain)

Radeon HD 7870 XT		88800 Mtexels/sec
Radeon HD 6750 1GB		26100 Mtexels/sec
	Difference: 62700 (240%)

Pixel Rate

If running with a high resolution is important to you, then the Radeon HD 7870 XT is the winner, and very much so. (explain)

Radeon HD 7870 XT		29600 Mpixels/sec
Radeon HD 6750 1GB		11600 Mpixels/sec
	Difference: 18000 (155%)

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 across the external memory interface in one second. The number is calculated by multiplying the bus width by its memory clock speed. If it uses DDR RAM, the result should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high 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 clock speed of the chip. The better this number, the better the graphics 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 number of pixels that the graphics card can possibly record to its local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the number of Render Output Units by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate is also dependant on lots of other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.