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

Intro

The GeForce 8800 GTS (G80) 320MB has a core clock frequency of 513 MHz and a GDDR3 memory frequency of 792 MHz. It also features a 320-bit bus, and makes use of a 90 nm design. It is comprised of 96 SPUs, 48 Texture Address Units, and 20 ROPs.

Compare those specs to the Radeon HD 3870 1GB, which comes with GPU clock speed of 775 MHz, and 1024 MB of GDDR4 RAM running at 1125 MHz through a 256-bit bus. It also is comprised of 320(64x5) Stream Processors, 16 Texture Address Units, and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 3870 1GB 106 Watts
GeForce 8800 GTS (G80) 320MB 143 Watts
Difference: 37 Watts (35%)

Memory Bandwidth

Performance-wise, the Radeon HD 3870 1GB should theoretically be just a bit better than the GeForce 8800 GTS (G80) 320MB in general. (explain)

Radeon HD 3870 1GB 72000 MB/sec
GeForce 8800 GTS (G80) 320MB 63360 MB/sec
Difference: 8640 (14%)

Texel Rate

The GeForce 8800 GTS (G80) 320MB will be a lot (about 99%) more effective at AF than the Radeon HD 3870 1GB. (explain)

GeForce 8800 GTS (G80) 320MB 24624 Mtexels/sec
Radeon HD 3870 1GB 12400 Mtexels/sec
Difference: 12224 (99%)

Pixel Rate

If running with a high screen resolution is important to you, then the Radeon HD 3870 1GB is the winner, by a large margin. (explain)

Radeon HD 3870 1GB 12400 Mpixels/sec
GeForce 8800 GTS (G80) 320MB 10260 Mpixels/sec
Difference: 2140 (21%)

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 GTS (G80) 320MB

Amazon.com

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Radeon HD 3870 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) 320MB Radeon HD 3870 1GB
Manufacturer nVidia AMD
Year Feb 2007 Nov 19, 2007
Code Name G80 RV670 XT
Memory 320 MB 1024 MB
Core Speed 513 MHz 775 MHz
Memory Speed 1584 MHz 2250 MHz
Power (Max TDP) 143 watts 106 watts
Bandwidth 63360 MB/sec 72000 MB/sec
Texel Rate 24624 Mtexels/sec 12400 Mtexels/sec
Pixel Rate 10260 Mpixels/sec 12400 Mpixels/sec
Unified Shaders 96 320(64x5)
Texture Mapping Units 48 16
Render Output Units 20 16
Bus Type GDDR3 GDDR4
Bus Width 320-bit 256-bit
Fab Process 90 nm 55 nm
Transistors 681 million (Unknown) million
Bus PCIe x16 PCIe 2.0 x16/AGP 8x
DirectX Version DirectX 10 DirectX 10.1
OpenGL Version OpenGL 3.0 OpenGL 3.0

Memory Bandwidth: Bandwidth is the maximum amount of data (in units of megabytes per second) that can be transported over the external memory interface within a second. The number is worked out by multiplying the card's bus width by the speed of its memory. If the card has DDR type memory, it should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels the video card could possibly write to its local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate is also dependant on many other factors, especially the memory bandwidth of the card - 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 GTS (G80) 320MB

Amazon.com

Check prices at:

Radeon HD 3870 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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