Radeon HD 6750 vs Radeon HD 6790

Intro

Compare all that to the Radeon HD 6790, which features a clock speed of 840 MHz and a GDDR5 memory speed of 1050 MHz. It also features a 256-bit memory bus, and makes use of a 40 nm design. It features 800 SPUs, 40 Texture Address Units, and 16 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 6790		150 Watts
	Difference: 64 Watts (74%)

Memory Bandwidth

As far as performance goes, the Radeon HD 6790 should in theory be quite a bit better than the Radeon HD 6750 overall. (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 anisotropic 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 a high resolution 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: Memory bandwidth is the maximum amount of information (measured in MB per second) that can be transferred past the external memory interface in one second. The number is calculated by multiplying the bus width by the speed of its memory. If the card has DDR memory, it must be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the bandwidth is, the better 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 per second. This number is worked out by multiplying the total amount of texture units of the card by the core clock speed of the chip. The higher the texel rate, the better the graphics 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 that the graphics card could possibly write to its local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate is also dependant on quite a few other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.