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GeForce 8800 GS vs Radeon HD 6790

Intro

The GeForce 8800 GS comes with core clock speeds of 550 MHz on the GPU, and 800 MHz on the 384 MB of GDDR3 memory. It features 96 SPUs along with 48 Texture Address Units and 12 ROPs.

Compare all that to the Radeon HD 6790, which uses a 40 nm design. AMD has set the core frequency at 840 MHz. The GDDR5 RAM runs at a frequency of 1050 MHz on this model. 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)

GeForce 8800 GS 105 Watts
Radeon HD 6790 150 Watts
Difference: 45 Watts (43%)

Memory Bandwidth

In theory, the Radeon HD 6790 should perform much faster than the GeForce 8800 GS in general. (explain)

Radeon HD 6790 134400 MB/sec
GeForce 8800 GS 38400 MB/sec
Difference: 96000 (250%)

Texel Rate

The Radeon HD 6790 will be quite a bit (more or less 27%) more effective at AF than the GeForce 8800 GS. (explain)

Radeon HD 6790 33600 Mtexels/sec
GeForce 8800 GS 26400 Mtexels/sec
Difference: 7200 (27%)

Pixel Rate

The Radeon HD 6790 is much (about 104%) faster with regards to FSAA than the GeForce 8800 GS, and also able to handle higher screen resolutions better. (explain)

Radeon HD 6790 13440 Mpixels/sec
GeForce 8800 GS 6600 Mpixels/sec
Difference: 6840 (104%)

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 GS

Amazon.com

Check prices at:

Radeon HD 6790

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.

Specifications

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Model GeForce 8800 GS Radeon HD 6790
Manufacturer nVidia AMD
Year Jan 2008 April 2011
Code Name G92 Barts LE
Memory 384 MB 1024 MB
Core Speed 550 MHz 840 MHz
Memory Speed 1600 MHz 4200 MHz
Power (Max TDP) 105 watts 150 watts
Bandwidth 38400 MB/sec 134400 MB/sec
Texel Rate 26400 Mtexels/sec 33600 Mtexels/sec
Pixel Rate 6600 Mpixels/sec 13440 Mpixels/sec
Unified Shaders 96 800
Texture Mapping Units 48 40
Render Output Units 12 16
Bus Type GDDR3 GDDR5
Bus Width 192-bit 256-bit
Fab Process 65 nm 40 nm
Transistors 754 million 1700 million
Bus PCIe x16 2.0 PCIe 2.1 x16
DirectX Version DirectX 10 DirectX 11
OpenGL Version OpenGL 3.0 OpenGL 4.1

Memory Bandwidth: Bandwidth is the largest amount of information (in units of megabytes per second) that can be transferred across the external memory interface in one second. The number is worked out by multiplying the interface width by its memory speed. If it uses DDR type memory, it must be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are applied per second. This number is worked out by multiplying the total number of texture units of the card by the core clock speed of the chip. The better 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 most pixels the video card can possibly record to the local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the number of Render Output Units by the clock speed of the card. ROPs (Raster Operations Pipelines - also called 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 - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.

Display Prices

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GeForce 8800 GS

Amazon.com

Check prices at:

Radeon HD 6790

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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