GeForce GTX 285 2GB vs Radeon HD 6790

Intro

Compare all of that to the Radeon HD 6790, which comes with GPU core speed of 840 MHz, and 1024 MB of GDDR5 memory running at 1050 MHz through a 256-bit bus. It also is comprised of 800 Stream Processors, 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 285 2GB		204 Watts
	Difference: 54 Watts (36%)

Memory Bandwidth

In theory, the GeForce GTX 285 2GB should be 18% quicker than the Radeon HD 6790 overall, because of its greater bandwidth. (explain)

GeForce GTX 285 2GB		158976 MB/sec
Radeon HD 6790		134400 MB/sec
	Difference: 24576 (18%)

Texel Rate

The GeForce GTX 285 2GB will be quite a bit (more or less 54%) better at texture filtering than the Radeon HD 6790. (explain)

GeForce GTX 285 2GB		51840 Mtexels/sec
Radeon HD 6790		33600 Mtexels/sec
	Difference: 18240 (54%)

Pixel Rate

The GeForce GTX 285 2GB should be much (more or less 54%) more effective at anti-aliasing than the Radeon HD 6790, and also will be capable of handling higher screen resolutions without losing too much performance. (explain)

GeForce GTX 285 2GB		20736 Mpixels/sec
Radeon HD 6790		13440 Mpixels/sec
	Difference: 7296 (54%)

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 largest amount of data (counted in MB per second) that can be moved over the external memory interface in one second. It is calculated by multiplying the interface width by its memory speed. If the card has DDR type 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 AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are processed per second. This figure is worked out by multiplying the total number of texture units by the core 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 applied in a second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip could possibly record to its local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the amount of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate also depends on lots of other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.