Radeon HD 6750 vs Radeon HD 7870

Intro

Compare all that to the Radeon HD 7870, which comes with a GPU core clock speed of 1000 MHz, and 2048 MB of GDDR5 memory set to run at 1200 MHz through a 256-bit bus. It also features 1280 Stream Processors, 80 TAUs, and 32 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6750		86 Watts
Radeon HD 7870		175 Watts
	Difference: 89 Watts (103%)

Memory Bandwidth

In theory, the Radeon HD 7870 will be 140% quicker than the Radeon HD 6750 overall, due to its higher bandwidth. (explain)

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

Texel Rate

The Radeon HD 7870 should be a lot (more or less 207%) more effective at AF than the Radeon HD 6750. (explain)

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

Pixel Rate

If using a high screen resolution is important to you, then the Radeon HD 7870 is superior to the Radeon HD 6750, and very much so. (explain)

Radeon HD 7870		32000 Mpixels/sec
Radeon HD 6750		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: Bandwidth is the maximum amount of data (counted in megabytes per second) that can be transported past the external memory interface in a second. The number is calculated by multiplying the interface width by its memory clock speed. If the card has DDR type memory, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card can possibly record to its local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the number of Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output 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 get to the max fill rate.