GeForce GTX 275 vs Radeon HD 6790

Intro

Compare all of that to the Radeon HD 6790, which features a clock speed of 840 MHz and a GDDR5 memory speed of 1050 MHz. It also uses a 256-bit memory bus, and uses a 40 nm design. It is made up of 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 6790		150 Watts
GeForce GTX 275		219 Watts
	Difference: 69 Watts (46%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 6790 will be 6% faster than the GeForce GTX 275 in general, because of its greater bandwidth. (explain)

Radeon HD 6790		134400 MB/sec
GeForce GTX 275		127008 MB/sec
	Difference: 7392 (6%)

Texel Rate

The GeForce GTX 275 is much (more or less 51%) faster with regards to anisotropic filtering than the Radeon HD 6790. (explain)

GeForce GTX 275		50640 Mtexels/sec
Radeon HD 6790		33600 Mtexels/sec
	Difference: 17040 (51%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the GeForce GTX 275 is the winner, and very much so. (explain)

GeForce GTX 275		17724 Mpixels/sec
Radeon HD 6790		13440 Mpixels/sec
	Difference: 4284 (32%)

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 information (measured in MB per second) that can be moved 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 RAM, the result should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are processed in one second. This figure is calculated by multiplying the total texture units of the card by the core clock speed of the chip. The better this number, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card could possibly write to the local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of Raster Operations Pipelines by the the card's clock speed. 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 rate is also dependant on quite a few other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.