Radeon HD 6750 vs Radeon HD 6790

Intro

Compare those specifications to the Radeon HD 6790, which comes with a core clock speed of 840 MHz and a GDDR5 memory speed of 1050 MHz. It also uses a 256-bit memory bus, and makes use of a 40 nm design. It features 800 SPUs, 40 TAUs, 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

Performance-wise, the Radeon HD 6790 should in theory be quite a bit superior to 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 will be a lot (approximately 29%) faster with regards to 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

The Radeon HD 6790 should be a small bit (approximately 16%) faster with regards to full screen anti-aliasing than the Radeon HD 6750, and will be able to handle higher screen resolutions while still performing well. (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 largest amount of data (in units of MB per second) that can be transferred over the external memory interface within a second. It 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 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the most pixels the video card can possibly write to its local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the number of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also called 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, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.