GeForce 8800 GTS (G92) vs Radeon HD 6790

Intro

Compare all of that to the Radeon HD 6790, which features a clock frequency of 840 MHz and a GDDR5 memory frequency of 1050 MHz. It also features a 256-bit bus, and makes use of a 40 nm design. It is comprised 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)

GeForce 8800 GTS (G92)		135 Watts
Radeon HD 6790		150 Watts
	Difference: 15 Watts (11%)

Memory Bandwidth

The Radeon HD 6790 should in theory perform quite a bit faster than the GeForce 8800 GTS (G92) overall. (explain)

Radeon HD 6790		134400 MB/sec
GeForce 8800 GTS (G92)		62080 MB/sec
	Difference: 72320 (116%)

Texel Rate

The GeForce 8800 GTS (G92) should be a lot (approximately 24%) faster with regards to anisotropic filtering than the Radeon HD 6790. (explain)

GeForce 8800 GTS (G92)		41600 Mtexels/sec
Radeon HD 6790		33600 Mtexels/sec
	Difference: 8000 (24%)

Pixel Rate

The Radeon HD 6790 should be quite a bit (about 29%) more effective at anti-aliasing than the GeForce 8800 GTS (G92), and will be capable of handling higher resolutions without losing too much performance. (explain)

Radeon HD 6790		13440 Mpixels/sec
GeForce 8800 GTS (G92)		10400 Mpixels/sec
	Difference: 3040 (29%)

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 (counted in MB per second) that can be transferred across the external memory interface within a second. The number is calculated by multiplying the bus width by its memory clock speed. In the case of DDR type RAM, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be processed in one second. This figure 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 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 most pixels the video card could possibly record to its local memory per second - measured in millions of pixels per second. Pixel rate is calculated 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 rate is also dependant on many other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the max fill rate.