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GeForce 8800 GTS (G80) 640MB vs Radeon HD 3870 X2 1GB

Intro

The GeForce 8800 GTS (G80) 640MB comes with clock speeds of 513 MHz on the GPU, and 792 MHz on the 640 MB of GDDR3 RAM. It features 96 SPUs as well as 48 TAUs and 20 ROPs.

Compare all that to the Radeon HD 3870 X2 1GB, which has a GPU core clock speed of 825 MHz, and 1024 MB of GDDR4 memory set to run at 1126 MHz through a 256-bit bus. It also features 320(64x5) SPUs, 16 TAUs, and 16 Raster Operation Units.

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

Theoretically speaking, the Radeon HD 3870 X2 1GB is 127% faster than the GeForce 8800 GTS (G80) 640MB overall, because of its greater bandwidth. (explain)

Radeon HD 3870 X2 1GB 144128 MB/sec
GeForce 8800 GTS (G80) 640MB 63360 MB/sec
Difference: 80768 (127%)

Texel Rate

The Radeon HD 3870 X2 1GB will be a small bit (approximately 7%) faster with regards to texture filtering than the GeForce 8800 GTS (G80) 640MB. (explain)

Radeon HD 3870 X2 1GB 26400 Mtexels/sec
GeForce 8800 GTS (G80) 640MB 24624 Mtexels/sec
Difference: 1776 (7%)

Pixel Rate

The Radeon HD 3870 X2 1GB will be quite a bit (about 157%) better at AA than the GeForce 8800 GTS (G80) 640MB, and should be capable of handling higher screen resolutions more effectively. (explain)

Radeon HD 3870 X2 1GB 26400 Mpixels/sec
GeForce 8800 GTS (G80) 640MB 10260 Mpixels/sec
Difference: 16140 (157%)

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.

One or more cards in this comparison are multi-core. This means that their bandwidth, texel and pixel rates are theoretically doubled - this does not mean the card will actually perform twice as fast, but only that it should in theory be able to. Actual game benchmarks will give a more accurate idea of what it's capable of.

Price Comparison

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GeForce 8800 GTS (G80) 640MB

Amazon.com

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Radeon HD 3870 X2 1GB

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 GTS (G80) 640MB Radeon HD 3870 X2 1GB
Manufacturer nVidia AMD
Year Nov 2006 (640) Jan 28, 2008
Code Name G80 R680
Memory 640 MB 1024 MB (x2)
Core Speed 513 MHz 825 MHz (x2)
Memory Speed 1584 MHz 2252 MHz (x2)
Power (Max TDP) 143 watts (Unknown) watts
Bandwidth 63360 MB/sec 144128 MB/sec
Texel Rate 24624 Mtexels/sec 26400 Mtexels/sec
Pixel Rate 10260 Mpixels/sec 26400 Mpixels/sec
Unified Shaders 96 320(64x5) (x2)
Texture Mapping Units 48 16 (x2)
Render Output Units 20 16 (x2)
Bus Type GDDR3 GDDR4
Bus Width 320-bit 256-bit (x2)
Fab Process 90 nm 55 nm
Transistors 681 million (Unknown) million
Bus PCIe x16 PCIe 2.0 x16/(internal PCIe 1.1 x16)
DirectX Version DirectX 10 DirectX 10.1
OpenGL Version OpenGL 3.0 OpenGL 3.0

Memory Bandwidth: Bandwidth is the maximum amount of information (counted in megabytes per second) that can be transferred past the external memory interface in a second. It's calculated by multiplying the bus width by its memory speed. If it uses DDR memory, it must be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the better 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 are applied per second. This is calculated by multiplying the total amount of texture units by the core speed of the chip. The higher this number, the better the video 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 the video card can possibly record to its local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate also depends on quite a few other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.

Display Prices

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GeForce 8800 GTS (G80) 640MB

Amazon.com

Check prices at:

Radeon HD 3870 X2 1GB

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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