Radeon HD 6750 vs Radeon HD 6790

Intro

Compare those specifications to the Radeon HD 6790, which features clock speeds of 840 MHz on the GPU, and 1050 MHz on the 1024 MB of GDDR5 RAM. It features 800 SPUs along with 40 Texture Address Units and 16 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6750		86 Watts
Radeon HD 6790		150 Watts
	Difference: 64 Watts (74%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 6790 should be much faster than the Radeon HD 6750 in general. (explain)

Radeon HD 6790		134400 MB/sec
Radeon HD 6750		64000 MB/sec
	Difference: 70400 (110%)

Texel Rate

The Radeon HD 6790 is a lot (approximately 29%) more effective at texture filtering than the Radeon HD 6750. (explain)

Radeon HD 6790		33600 Mtexels/sec
Radeon HD 6750		26100 Mtexels/sec
	Difference: 7500 (29%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the Radeon HD 6790 is a better choice, but not by far. (explain)

Radeon HD 6790		13440 Mpixels/sec
Radeon HD 6750		11600 Mpixels/sec
	Difference: 1840 (16%)

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 max amount of data (counted in megabytes per second) that can be moved over the external memory interface within a second. It's worked out by multiplying the bus width by its memory speed. If the card has DDR RAM, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the faster 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 processed in one second. This figure is calculated by multiplying the total texture units by the core clock speed of the chip. The better this number, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in one second.

Pixel Rate: Pixel rate is the most pixels the graphics card can possibly write to the local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of Render Output Units by the clock speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate is also dependant on many other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.