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GeForce 8800 Ultra vs Radeon HD 6850

Intro

The GeForce 8800 Ultra uses a 90 nm design. nVidia has clocked the core frequency at 612 MHz. The GDDR3 RAM works at a speed of 1080 MHz on this particular card. It features 128 SPUs along with 64 Texture Address Units and 24 ROPs.

Compare those specs to the Radeon HD 6850, which comes with core clock speeds of 775 MHz on the GPU, and 1000 MHz on the 1024 MB of GDDR5 RAM. It features 960 SPUs as well as 48 TAUs and 32 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6850 127 Watts
GeForce 8800 Ultra 171 Watts
Difference: 44 Watts (35%)

Memory Bandwidth

The Radeon HD 6850 should theoretically be quite a bit faster than the GeForce 8800 Ultra overall. (explain)

Radeon HD 6850 128000 MB/sec
GeForce 8800 Ultra 103680 MB/sec
Difference: 24320 (23%)

Texel Rate

The GeForce 8800 Ultra will be a little bit (about 5%) faster with regards to AF than the Radeon HD 6850. (explain)

GeForce 8800 Ultra 39168 Mtexels/sec
Radeon HD 6850 37200 Mtexels/sec
Difference: 1968 (5%)

Pixel Rate

The Radeon HD 6850 is a lot (about 69%) more effective at anti-aliasing than the GeForce 8800 Ultra, and also will be able to handle higher screen resolutions without losing too much performance. (explain)

Radeon HD 6850 24800 Mpixels/sec
GeForce 8800 Ultra 14688 Mpixels/sec
Difference: 10112 (69%)

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 Ultra

Amazon.com

Check prices at:

Radeon HD 6850

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 Ultra Radeon HD 6850
Manufacturer nVidia AMD
Year May 2007 October 2010
Code Name G80 Barts Pro
Memory 768 MB 1024 MB
Core Speed 612 MHz 775 MHz
Memory Speed 2160 MHz 4000 MHz
Power (Max TDP) 171 watts 127 watts
Bandwidth 103680 MB/sec 128000 MB/sec
Texel Rate 39168 Mtexels/sec 37200 Mtexels/sec
Pixel Rate 14688 Mpixels/sec 24800 Mpixels/sec
Unified Shaders 128 960
Texture Mapping Units 64 48
Render Output Units 24 32
Bus Type GDDR3 GDDR5
Bus Width 384-bit 256-bit
Fab Process 90 nm 40 nm
Transistors 681 million 1700 million
Bus PCIe x16 PCIe x16
DirectX Version DirectX 10 DirectX 11
OpenGL Version OpenGL 3.0 OpenGL 4.1

Memory Bandwidth: Bandwidth is the maximum amount of information (counted in megabytes per second) that can be moved past the external memory interface within a second. The number is calculated by multiplying the bus width by its memory speed. In the case of DDR type RAM, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels the video card can possibly record to its local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the number of Render Output Units by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel 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.

Display Prices

Hide Prices

GeForce 8800 Ultra

Amazon.com

Check prices at:

Radeon HD 6850

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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