GeForce 8800 GTS (G80) 640MB vs Radeon HD 5770

Intro

Compare all that to the Radeon HD 5770, which has clock speeds of 850 MHz on the GPU, and 1200 MHz on the 1024 MB of GDDR5 RAM. It features 800(160x5) SPUs along with 40 TAUs and 16 ROPs.

F.E.A.R. 2

Settings:	Maximum Quality
AA:	4x
AF:	8x
Resolution:	1920x1200
Test Machine:	Unknown (Source)

Radeon HD 5770		74 FPS
GeForce 8800 GTS (G80) 640MB		30 FPS
	Difference: 44 FPS (147%)

Fallout 3

Settings:	Very High Quality
AA:	8x
AF:	16x
Resolution:	1920x1200
Test Machine:	Tom's Hardware Test Machine (Source)

Radeon HD 5770		54 FPS
GeForce 8800 GTS (G80) 640MB		14 FPS
	Difference: 40 FPS (286%)

Fallout 3

Settings:	Very High Quality
AA:	4x
AF:	8x
Resolution:	1680x1050
Test Machine:	Tom's Hardware Charts Test Rig (Source)

Radeon HD 5770		68 FPS
GeForce 8800 GTS (G80) 640MB		38 FPS
	Difference: 30 FPS (79%)

Left4Dead

Settings:	Very High Quality
AA:	8x
AF:	16x
Resolution:	1920x1200
Test Machine:	Tom's Hardware Test Machine (Source)

Radeon HD 5770		66 FPS
GeForce 8800 GTS (G80) 640MB		32 FPS
	Difference: 34 FPS (106%)

Left4Dead

Settings:	Very High Quality
AA:	4x
AF:	8x
Resolution:	1920x1200
Test Machine:	Tom's Hardware Charts Test Rig (Source)

Radeon HD 5770		70 FPS
GeForce 8800 GTS (G80) 640MB		38 FPS
	Difference: 32 FPS (84%)

Tom Clancy's Endwar

Settings:	High Quality
AA:	4x
AF:	8x
Resolution:	1920x1200
Test Machine:	Tom's Hardware Test Machine (Source)

Radeon HD 5770		28 FPS
GeForce 8800 GTS (G80) 640MB		14 FPS
	Difference: 14 FPS (100%)

Tom Clancy's H.A.W.X

Settings:	High Quality
AA:	4x
AF:	8x
Resolution:	1680x1050
Test Machine:	Tom's Hardware Charts Test Rig (Source)

Radeon HD 5770		37 FPS
GeForce 8800 GTS (G80) 640MB		30 FPS
	Difference: 7 FPS (23%)

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Radeon HD 5770 wins

(Based entirely on the benchmarks listed above)

When combining all game benchmark scores on this page together, the Radeon HD 5770 wins overall, by 231 FPS. Please note that we do not have the results of every benchmark ever done for these cards, so the results may differ wildly in different games.

Radeon HD 5770		465 FPS
GeForce 8800 GTS (G80) 640MB		234 FPS
	Difference: 231 FPS (99%)

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 5770		108 Watts
GeForce 8800 GTS (G80) 640MB		143 Watts
	Difference: 35 Watts (32%)

Memory Bandwidth

In theory, the Radeon HD 5770 is 21% faster than the GeForce 8800 GTS (G80) 640MB overall, because of its greater data rate. (explain)

Radeon HD 5770		76800 MB/sec
GeForce 8800 GTS (G80) 640MB		63360 MB/sec
	Difference: 13440 (21%)

Texel Rate

The Radeon HD 5770 is much (about 38%) faster with regards to texture filtering than the GeForce 8800 GTS (G80) 640MB. (explain)

Radeon HD 5770		34000 Mtexels/sec
GeForce 8800 GTS (G80) 640MB		24624 Mtexels/sec
	Difference: 9376 (38%)

Pixel Rate

The Radeon HD 5770 should be quite a bit (more or less 33%) more effective at AA than the GeForce 8800 GTS (G80) 640MB, and also able to handle higher screen resolutions more effectively. (explain)

Radeon HD 5770		13600 Mpixels/sec
GeForce 8800 GTS (G80) 640MB		10260 Mpixels/sec
	Difference: 3340 (33%)

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 information (counted in MB per second) that can be moved over the external memory interface in one second. It is calculated by multiplying the card's bus width by its memory clock speed. If the card has DDR type memory, it must be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be applied per second. This is calculated by multiplying the total texture units by the core speed of the chip. The higher this number, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip can possibly record to the local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of Render Output Units by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate is also dependant on many other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the max fill rate.