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

Intro

The GeForce 8800 GTS (G80) 320MB uses a 90 nm design. nVidia has set the core frequency at 513 MHz. The GDDR3 RAM runs at a frequency of 792 MHz on this card. It features 96 SPUs as well as 48 TAUs and 20 Rasterization Operator Units.

Compare those specifications to the Radeon HD 3870 512MB, which comes with core clock speeds of 775 MHz on the GPU, and 900 MHz on the 512 MB of GDDR3 RAM. It features 320(64x5) SPUs along with 16 TAUs and 16 ROPs.

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

The GeForce 8800 GTS (G80) 320MB should in theory perform a bit faster than the Radeon HD 3870 512MB in general. (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 a lot (about 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 should be a lot (about 21%) faster with regards to full screen anti-aliasing than the GeForce 8800 GTS (G80) 320MB, and also will be able to handle higher screen resolutions while still performing well. (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: Memory bandwidth is the largest amount of information (counted in megabytes per second) that can be moved across the external memory interface in a second. The number is calculated by multiplying the interface width by its memory clock speed. If it uses DDR RAM, the result should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the memory bandwidth, the better 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 per second. This figure is worked out by multiplying the total number of texture units by the core 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 per second.

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card could possibly record to the local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the number of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate is also dependant on many other factors, most notably the memory bandwidth - 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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