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GeForce 8800 GTS (G80) 320MB vs Radeon HD 6750

Intro

The GeForce 8800 GTS (G80) 320MB comes with core clock speeds of 513 MHz on the GPU, and 792 MHz on the 320 MB of GDDR3 RAM. It features 96 SPUs along with 48 TAUs and 20 ROPs.

Compare that to the Radeon HD 6750, which features core clock speeds of 725 MHz on the GPU, and 1000 MHz on the 512 MB of GDDR5 memory. It features 720 SPUs as well as 36 TAUs and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6750		86 Watts
GeForce 8800 GTS (G80) 320MB		143 Watts
	Difference: 57 Watts (66%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 6750 will be 1% faster than the GeForce 8800 GTS (G80) 320MB in general, due to its greater bandwidth. (explain)

Radeon HD 6750		64000 MB/sec
GeForce 8800 GTS (G80) 320MB		63360 MB/sec
	Difference: 640 (1%)

Texel Rate

The Radeon HD 6750 should be just a bit (more or less 6%) more effective at anisotropic filtering than the GeForce 8800 GTS (G80) 320MB. (explain)

Radeon HD 6750		26100 Mtexels/sec
GeForce 8800 GTS (G80) 320MB		24624 Mtexels/sec
	Difference: 1476 (6%)

Pixel Rate

The Radeon HD 6750 is a little bit (more or less 13%) more effective at AA than the GeForce 8800 GTS (G80) 320MB, and also will be able to handle higher resolutions without losing too much performance. (explain)

Radeon HD 6750		11600 Mpixels/sec
GeForce 8800 GTS (G80) 320MB		10260 Mpixels/sec
	Difference: 1340 (13%)

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

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GeForce 8800 GTS (G80) 320MB

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Radeon HD 6750

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Specifications

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Model	GeForce 8800 GTS (G80) 320MB	Radeon HD 6750
Manufacturer	nVidia	AMD
Year	Feb 2007	January 2011
Code Name	G80	Juniper Pro
Memory	320 MB	512 MB
Core Speed	513 MHz	725 MHz
Memory Speed	1584 MHz	4000 MHz
Power (Max TDP)	143 watts	86 watts
Bandwidth	63360 MB/sec	64000 MB/sec
Texel Rate	24624 Mtexels/sec	26100 Mtexels/sec
Pixel Rate	10260 Mpixels/sec	11600 Mpixels/sec
Unified Shaders	96	720
Texture Mapping Units	48	36
Render Output Units	20	16
Bus Type	GDDR3	GDDR5
Bus Width	320-bit	128-bit
Fab Process	90 nm	40 nm
Transistors	681 million	1040 million
Bus	PCIe x16	PCIe x16
DirectX Version	DirectX 10	DirectX 11
OpenGL Version	OpenGL 3.0	OpenGL 4.0

Memory Bandwidth: Memory bandwidth is the max amount of data (measured in megabytes per second) that can be transported over the external memory interface in one second. It is worked out by multiplying the bus width by the speed of its memory. In the case of DDR RAM, the result should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are applied in one second. This figure is calculated by multiplying the total number of texture units by the core clock speed of the chip. The better the texel rate, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

Pixel Rate: Pixel rate is the most pixels that the graphics card can possibly write to the local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of Raster Operations Pipelines by the the core 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 lots of other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.

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