GeForce 8800 GTS (G80) 640MB vs Radeon HD 6770

Intro

Compare those specifications to the Radeon HD 6770, which features GPU clock speed of 900 MHz, and 512 MB of GDDR5 memory set to run at 1050 MHz through a 128-bit bus. It also is comprised of 800 Stream Processors, 40 TAUs, 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) 640MB		143 Watts
	Difference: 35 Watts (32%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 6770 will be 6% quicker than the GeForce 8800 GTS (G80) 640MB overall, due to its greater bandwidth. (explain)

Radeon HD 6770		67200 MB/sec
GeForce 8800 GTS (G80) 640MB		63360 MB/sec
	Difference: 3840 (6%)

Texel Rate

The Radeon HD 6770 will be a lot (about 46%) better at texture filtering than the GeForce 8800 GTS (G80) 640MB. (explain)

Radeon HD 6770		36000 Mtexels/sec
GeForce 8800 GTS (G80) 640MB		24624 Mtexels/sec
	Difference: 11376 (46%)

Pixel Rate

The Radeon HD 6770 is much (about 40%) more effective at AA than the GeForce 8800 GTS (G80) 640MB, and also should be able to handle higher screen resolutions more effectively. (explain)

Radeon HD 6770		14400 Mpixels/sec
GeForce 8800 GTS (G80) 640MB		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 max amount of information (in units of MB per second) that can be moved over the external memory interface within a second. It is calculated by multiplying the card's interface width by its memory speed. In the case of DDR RAM, it should be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher 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 figure is worked out by multiplying the total amount of texture units by the core speed of the chip. The higher this number, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card could possibly record to its local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the number of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate is also dependant on quite a few other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.