Radeon HD 6750 1GB vs Radeon HD 7870

Intro

Compare that to the Radeon HD 7870, which comes with clock speeds of 1000 MHz on the GPU, and 1200 MHz on the 2048 MB of GDDR5 memory. It features 1280 SPUs as well as 80 Texture Address Units 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		175 Watts
	Difference: 89 Watts (103%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 7870 should be 140% quicker than the Radeon HD 6750 1GB in general, because of its higher data rate. (explain)

Radeon HD 7870		153600 MB/sec
Radeon HD 6750 1GB		64000 MB/sec
	Difference: 89600 (140%)

Texel Rate

The Radeon HD 7870 should be quite a bit (approximately 207%) more effective at AF than the Radeon HD 6750 1GB. (explain)

Radeon HD 7870		80000 Mtexels/sec
Radeon HD 6750 1GB		26100 Mtexels/sec
	Difference: 53900 (207%)

Pixel Rate

The Radeon HD 7870 will be much (about 176%) better at full screen anti-aliasing than the Radeon HD 6750 1GB, and also will be capable of handling higher resolutions without slowing down too much. (explain)

Radeon HD 7870		32000 Mpixels/sec
Radeon HD 6750 1GB		11600 Mpixels/sec
	Difference: 20400 (176%)

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 (measured in MB per second) that can be transported past the external memory interface in one second. It's worked out by multiplying the bus width by its memory clock speed. If it uses DDR memory, it should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the bandwidth is, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are applied per second. This number 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 texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip could possibly write to the local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the number of ROPs 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 output rate is also dependant on quite a few other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the max fill rate.