GeForce 8800 GTS (G80) 320MB vs Radeon HD 6790

Intro

Compare those specifications to the Radeon HD 6790, which has core speeds of 840 MHz on the GPU, and 1050 MHz on the 1024 MB of GDDR5 memory. It features 800 SPUs along with 40 Texture Address Units and 16 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 8800 GTS (G80) 320MB		143 Watts
Radeon HD 6790		150 Watts
	Difference: 7 Watts (5%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 6790 should perform quite a bit faster than the GeForce 8800 GTS (G80) 320MB in general. (explain)

Radeon HD 6790		134400 MB/sec
GeForce 8800 GTS (G80) 320MB		63360 MB/sec
	Difference: 71040 (112%)

Texel Rate

The Radeon HD 6790 will be quite a bit (about 36%) faster with regards to texture filtering than the GeForce 8800 GTS (G80) 320MB. (explain)

Radeon HD 6790		33600 Mtexels/sec
GeForce 8800 GTS (G80) 320MB		24624 Mtexels/sec
	Difference: 8976 (36%)

Pixel Rate

The Radeon HD 6790 should be quite a bit (about 31%) faster with regards to AA than the GeForce 8800 GTS (G80) 320MB, and also should be able to handle higher screen resolutions better. (explain)

Radeon HD 6790		13440 Mpixels/sec
GeForce 8800 GTS (G80) 320MB		10260 Mpixels/sec
	Difference: 3180 (31%)

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 (measured in megabytes per second) that can be transferred past the external memory interface in one second. The number is worked out by multiplying the card's bus width by its memory speed. If the card has DDR RAM, the result should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the bandwidth is, 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 can be applied 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 higher the texel rate, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in one second.

Pixel Rate: Pixel rate is the maximum number of pixels the video card could possibly record to the local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of Raster Operations Pipelines by the the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called 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, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the max fill rate.