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GeForce 8800 GTS (G80) 320MB vs Radeon HD 3870 512MB

Intro

The GeForce 8800 GTS (G80) 320MB has a GPU clock speed of 513 MHz, and the 320 MB of GDDR3 RAM runs at 792 MHz through a 320-bit bus. It also features 96 SPUs, 48 TAUs, and 20 ROPs.

Compare those specs to the Radeon HD 3870 512MB, which has GPU clock speed of 775 MHz, and 512 MB of GDDR3 RAM set to run at 900 MHz through a 256-bit bus. It also features 320(64x5) Stream Processors, 16 Texture Address Units, and 16 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 3870 512MB 106 Watts
GeForce 8800 GTS (G80) 320MB 143 Watts
Difference: 37 Watts (35%)

Memory Bandwidth

Theoretically speaking, the GeForce 8800 GTS (G80) 320MB should be a little bit faster than the Radeon HD 3870 512MB overall. (explain)

GeForce 8800 GTS (G80) 320MB 63360 MB/sec
Radeon HD 3870 512MB 57600 MB/sec
Difference: 5760 (10%)

Texel Rate

The GeForce 8800 GTS (G80) 320MB is much (approximately 99%) more effective at anisotropic filtering than the Radeon HD 3870 512MB. (explain)

GeForce 8800 GTS (G80) 320MB 24624 Mtexels/sec
Radeon HD 3870 512MB 12400 Mtexels/sec
Difference: 12224 (99%)

Pixel Rate

The Radeon HD 3870 512MB is a lot (approximately 21%) better at FSAA than the GeForce 8800 GTS (G80) 320MB, and should be capable of handling higher screen resolutions without slowing down too much. (explain)

Radeon HD 3870 512MB 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

Check prices at:

Radeon HD 3870 512MB

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 512MB
Manufacturer nVidia AMD
Year Feb 2007 Nov 19, 2007
Code Name G80 RV670 XT
Memory 320 MB 512 MB
Core Speed 513 MHz 775 MHz
Memory Speed 1584 MHz 1800 MHz
Power (Max TDP) 143 watts 106 watts
Bandwidth 63360 MB/sec 57600 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 GDDR3
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 (counted in megabytes per second) that can be transferred across the external memory interface within a second. It is worked out by multiplying the card's interface width by the speed of its memory. In the case of DDR type memory, the result should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR 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 amount of texture units by the core 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 processed per second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip can possibly write to its local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the amount of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate is also dependant on quite a few other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the max fill rate.

Display Prices

Hide Prices

GeForce 8800 GTS (G80) 320MB

Amazon.com

Check prices at:

Radeon HD 3870 512MB

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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