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GeForce 8800 GTX vs Radeon HD 6870

Intro

The GeForce 8800 GTX uses a 90 nm design. nVidia has clocked the core frequency at 575 MHz. The GDDR3 RAM is set to run at a speed of 900 MHz on this particular model. It features 128 SPUs as well as 64 TAUs and 24 ROPs.

Compare those specifications to the Radeon HD 6870, which features clock speeds of 900 MHz on the GPU, and 1050 MHz on the 1024 MB of GDDR5 memory. It features 1120 SPUs as well as 56 TAUs and 32 Rasterization Operator Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6870 151 Watts
GeForce 8800 GTX 155 Watts
Difference: 4 Watts (3%)

Memory Bandwidth

The Radeon HD 6870 should theoretically perform quite a bit faster than the GeForce 8800 GTX overall. (explain)

Radeon HD 6870 134400 MB/sec
GeForce 8800 GTX 86400 MB/sec
Difference: 48000 (56%)

Texel Rate

The Radeon HD 6870 should be a lot (more or less 37%) faster with regards to AF than the GeForce 8800 GTX. (explain)

Radeon HD 6870 50400 Mtexels/sec
GeForce 8800 GTX 36800 Mtexels/sec
Difference: 13600 (37%)

Pixel Rate

The Radeon HD 6870 should be much (approximately 109%) more effective at FSAA than the GeForce 8800 GTX, and also will be able to handle higher resolutions more effectively. (explain)

Radeon HD 6870 28800 Mpixels/sec
GeForce 8800 GTX 13800 Mpixels/sec
Difference: 15000 (109%)

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 GTX

Amazon.com

Check prices at:

Radeon HD 6870

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 GTX Radeon HD 6870
Manufacturer nVidia AMD
Year Nov 2006 October 2010
Code Name G80 Barts XT
Memory 768 MB 1024 MB
Core Speed 575 MHz 900 MHz
Memory Speed 1800 MHz 4200 MHz
Power (Max TDP) 155 watts 151 watts
Bandwidth 86400 MB/sec 134400 MB/sec
Texel Rate 36800 Mtexels/sec 50400 Mtexels/sec
Pixel Rate 13800 Mpixels/sec 28800 Mpixels/sec
Unified Shaders 128 1120
Texture Mapping Units 64 56
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: Memory bandwidth is the largest amount of data (in units of megabytes per second) that can be moved across the external memory interface within a second. The number is worked out by multiplying the card's bus width by its memory clock speed. If it uses DDR memory, it should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the bandwidth is, 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 can be applied in one second. This number is calculated by multiplying the total texture units of the card by the core speed of the chip. The better this number, 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 the graphics card could possibly record to its 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 sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate is also dependant on many other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.

Display Prices

Hide Prices

GeForce 8800 GTX

Amazon.com

Check prices at:

Radeon HD 6870

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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