GeForce 8800 GTS (G80) 320MB vs Radeon HD 6770

Intro

Compare all of that to the Radeon HD 6770, which makes use of a 40 nm design. AMD has set the core frequency at 900 MHz. The GDDR5 RAM runs at a frequency of 1050 MHz on this specific model. It features 800 SPUs as well as 40 Texture Address Units and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6770		108 Watts
GeForce 8800 GTS (G80) 320MB		143 Watts
	Difference: 35 Watts (32%)

Memory Bandwidth

The Radeon HD 6770 should in theory be a small bit faster than the GeForce 8800 GTS (G80) 320MB in general. (explain)

Radeon HD 6770		67200 MB/sec
GeForce 8800 GTS (G80) 320MB		63360 MB/sec
	Difference: 3840 (6%)

Texel Rate

The Radeon HD 6770 should be a lot (about 46%) faster with regards to AF than the GeForce 8800 GTS (G80) 320MB. (explain)

Radeon HD 6770		36000 Mtexels/sec
GeForce 8800 GTS (G80) 320MB		24624 Mtexels/sec
	Difference: 11376 (46%)

Pixel Rate

The Radeon HD 6770 is much (more or less 40%) better at full screen anti-aliasing than the GeForce 8800 GTS (G80) 320MB, and should be able to handle higher resolutions without slowing down too much. (explain)

Radeon HD 6770		14400 Mpixels/sec
GeForce 8800 GTS (G80) 320MB		10260 Mpixels/sec
	Difference: 4140 (40%)

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 data (measured in megabytes per second) that can be transferred past the external memory interface in one second. The number is calculated by multiplying the bus width by its memory clock speed. If the card has DDR type RAM, it should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the bandwidth is, the better 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 number of texture map elements (texels) that are processed per second. This is worked out by multiplying the total amount of texture units of the card by the core 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 in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card could possibly write to its local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate also depends on lots of other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.