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

Intro

The GeForce 8800 GTS (G80) 640MB uses a 90 nm design. nVidia has clocked the core speed at 513 MHz. The GDDR3 memory works at a frequency of 792 MHz on this model. It features 96 SPUs along with 48 TAUs and 20 Rasterization Operator Units.

Compare all that to the Radeon HD 6770, which makes use of a 40 nm design. AMD has set the core speed at 900 MHz. The GDDR5 RAM works at a speed of 1050 MHz on this particular card. It features 800 SPUs as well as 40 TAUs and 16 ROPs.

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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

The Radeon HD 6770 should theoretically perform a small bit faster than the GeForce 8800 GTS (G80) 640MB in general. (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 quite a bit (approximately 46%) faster with regards to AF 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

If running with a high resolution is important to you, then the Radeon HD 6770 is a better choice, by a large margin. (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

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GeForce 8800 GTS (G80) 640MB

Amazon.com

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Radeon HD 6770

Amazon.com

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Please note that the price comparisons are based on search keywords - sometimes it might show cards with very similar names that are not exactly the same as the one chosen in the comparison. We do try to filter out the wrong results as best we can, though.

Specifications

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Model GeForce 8800 GTS (G80) 640MB Radeon HD 6770
Manufacturer nVidia AMD
Year Nov 2006 (640) January 2011
Code Name G80 Juniper XT
Memory 640 MB 512 MB
Core Speed 513 MHz 900 MHz
Memory Speed 1584 MHz 4200 MHz
Power (Max TDP) 143 watts 108 watts
Bandwidth 63360 MB/sec 67200 MB/sec
Texel Rate 24624 Mtexels/sec 36000 Mtexels/sec
Pixel Rate 10260 Mpixels/sec 14400 Mpixels/sec
Unified Shaders 96 800
Texture Mapping Units 48 40
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 4.1

Memory Bandwidth: Memory bandwidth is the largest amount of information (measured in megabytes per second) that can be moved across the external memory interface in one second. The number is worked out by multiplying the card's bus width by its memory clock speed. If it uses DDR RAM, it must be multiplied by 2 again. If DDR5, multiply by 4 instead. The better 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 per second. This is worked out by multiplying the total amount of texture units by the core speed of the chip. The better the texel rate, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip could possibly write to its local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the amount of Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate is also dependant on quite a few other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.

Display Prices

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GeForce 8800 GTS (G80) 640MB

Amazon.com

Check prices at:

Radeon HD 6770

Amazon.com

Check prices at:

Please note that the price comparisons are based on search keywords - sometimes it might show cards with very similar names that are not exactly the same as the one chosen in the comparison. We do try to filter out the wrong results as best we can, though.

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