GeForce GTX 275 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 uses a 256-bit memory bus, and makes use of a 40 nm design. It is comprised of 800 SPUs, 40 TAUs, and 16 Raster Operation Units.

Display Graphs

Hide Graphs

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, the Radeon HD 6790 should be a little bit faster than the GeForce GTX 275 overall. (explain)

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

Texel Rate

The GeForce GTX 275 will be quite a bit (approximately 51%) better at texture 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 running with a high resolution is important to you, then the GeForce GTX 275 is the winner, by a large margin. (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: Memory bandwidth is the largest amount of information (counted in megabytes per second) that can be transferred over the external memory interface in a second. It's worked out by multiplying the card's interface width by the speed of its memory. If it uses DDR memory, it must be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the card's memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be applied per second. This is worked out 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 texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card could possibly write to the local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate also depends on lots of other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.