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GeForce 8800 GTS (G80) 320MB vs Radeon HD 3870 X2 1GB

Intro

The GeForce 8800 GTS (G80) 320MB has a GPU core speed of 513 MHz, and the 320 MB of GDDR3 memory is set to run at 792 MHz through a 320-bit bus. It also features 96 Stream Processors, 48 Texture Address Units, and 20 Raster Operation Units.

Compare those specifications to the Radeon HD 3870 X2 1GB, which comes with a core clock speed of 825 MHz and a GDDR4 memory speed of 1126 MHz. It also makes use of a 256-bit bus, and uses a 55 nm design. It is comprised of 320(64x5) SPUs, 16 Texture Address Units, and 16 Raster Operation Units.

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

In theory, the Radeon HD 3870 X2 1GB should be quite a bit faster than the GeForce 8800 GTS (G80) 320MB in general. (explain)

Radeon HD 3870 X2 1GB 144128 MB/sec
GeForce 8800 GTS (G80) 320MB 63360 MB/sec
Difference: 80768 (127%)

Texel Rate

The Radeon HD 3870 X2 1GB will be a little bit (more or less 7%) faster with regards to AF than the GeForce 8800 GTS (G80) 320MB. (explain)

Radeon HD 3870 X2 1GB 26400 Mtexels/sec
GeForce 8800 GTS (G80) 320MB 24624 Mtexels/sec
Difference: 1776 (7%)

Pixel Rate

If using a high resolution is important to you, then the Radeon HD 3870 X2 1GB is a better choice, by a large margin. (explain)

Radeon HD 3870 X2 1GB 26400 Mpixels/sec
GeForce 8800 GTS (G80) 320MB 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) 320MB

Amazon.com

Radeon HD 3870 X2 1GB

Amazon.com

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) 320MB Radeon HD 3870 X2 1GB
Manufacturer nVidia AMD
Year Feb 2007 Jan 28, 2008
Code Name G80 R680
Memory 320 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: Memory bandwidth is the maximum amount of data (in units of MB per second) that can be transported across the external memory interface in a second. The number is calculated by multiplying the bus width by the speed of its memory. If the card has DDR type RAM, it must be multiplied by 2 once 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, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the most pixels the video card could possibly record to the local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the number of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate also depends on quite a few other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.

Display Prices

Hide Prices

GeForce 8800 GTS (G80) 320MB

Amazon.com

Radeon HD 3870 X2 1GB

Amazon.com

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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