Radeon HD 6750 1GB vs Radeon HD 7870

Intro

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

Memory Bandwidth

The Radeon HD 7870 should in theory be quite a bit faster than the Radeon HD 6750 1GB overall. (explain)

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

Texel Rate

The Radeon HD 7870 is quite a bit (approximately 207%) more effective at anisotropic filtering 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 is a lot (about 176%) more effective at AA than the Radeon HD 6750 1GB, and also should be capable of handling higher resolutions without losing too much performance. (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 largest amount of information (counted in MB per second) that can be transferred past the external memory interface in one second. It's calculated by multiplying the interface width by its memory clock speed. In the case of DDR type memory, it should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the better the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be applied in one second. This figure is worked out by multiplying the total 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 applied in one second.

Pixel Rate: Pixel rate is the most pixels the graphics card can possibly write to its local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the amount of ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate is also dependant on quite a few other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the max fill rate.