Radeon HD 6750 1GB vs Radeon HD 6870

Intro

Compare those specs to the Radeon HD 6870, which has clock speeds of 900 MHz on the GPU, and 1050 MHz on the 1024 MB of GDDR5 memory. It features 1120 SPUs along with 56 Texture Address Units and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6750 1GB		86 Watts
Radeon HD 6870		151 Watts
	Difference: 65 Watts (76%)

Memory Bandwidth

As far as performance goes, the Radeon HD 6870 should in theory be a lot superior to the Radeon HD 6750 1GB in general. (explain)

Radeon HD 6870		134400 MB/sec
Radeon HD 6750 1GB		64000 MB/sec
	Difference: 70400 (110%)

Texel Rate

The Radeon HD 6870 will be much (about 93%) more effective at AF than the Radeon HD 6750 1GB. (explain)

Radeon HD 6870		50400 Mtexels/sec
Radeon HD 6750 1GB		26100 Mtexels/sec
	Difference: 24300 (93%)

Pixel Rate

If running with a high resolution is important to you, then the Radeon HD 6870 is superior to the Radeon HD 6750 1GB, by far. (explain)

Radeon HD 6870		28800 Mpixels/sec
Radeon HD 6750 1GB		11600 Mpixels/sec
	Difference: 17200 (148%)

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 data (in units of megabytes per second) that can be moved past the external memory interface in one second. It's worked out by multiplying the interface width by its memory clock speed. If it uses DDR RAM, the result should be multiplied by 2 once 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 AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be processed in one second. This is worked out by multiplying the total number of texture units of the card by the core clock 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 per second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip could possibly write to the local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as 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, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.