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GeForce 8800 GTX vs Radeon HD 3870 1GB

Intro

The GeForce 8800 GTX comes with core clock speeds of 575 MHz on the GPU, and 900 MHz on the 768 MB of GDDR3 RAM. It features 128 SPUs along with 64 TAUs and 24 Rasterization Operator Units.

Compare all that to the Radeon HD 3870 1GB, which makes use of a 55 nm design. AMD has clocked the core frequency at 775 MHz. The GDDR4 memory runs at a frequency of 1125 MHz on this specific card. It features 320(64x5) SPUs as well as 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 GTX 155 Watts
Difference: 49 Watts (46%)

Memory Bandwidth

Theoretically speaking, the GeForce 8800 GTX will be 20% faster than the Radeon HD 3870 1GB overall, because of its higher data rate. (explain)

GeForce 8800 GTX 86400 MB/sec
Radeon HD 3870 1GB 72000 MB/sec
Difference: 14400 (20%)

Texel Rate

The GeForce 8800 GTX is a lot (approximately 197%) more effective at AF than the Radeon HD 3870 1GB. (explain)

GeForce 8800 GTX 36800 Mtexels/sec
Radeon HD 3870 1GB 12400 Mtexels/sec
Difference: 24400 (197%)

Pixel Rate

If using high levels of AA is important to you, then the GeForce 8800 GTX is the winner, though not by far. (explain)

GeForce 8800 GTX 13800 Mpixels/sec
Radeon HD 3870 1GB 12400 Mpixels/sec
Difference: 1400 (11%)

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 GTX

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.

Specifications

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Model GeForce 8800 GTX Radeon HD 3870 1GB
Manufacturer nVidia AMD
Year Nov 2006 Nov 19, 2007
Code Name G80 RV670 XT
Memory 768 MB 1024 MB
Core Speed 575 MHz 775 MHz
Memory Speed 1800 MHz 2250 MHz
Power (Max TDP) 155 watts 106 watts
Bandwidth 86400 MB/sec 72000 MB/sec
Texel Rate 36800 Mtexels/sec 12400 Mtexels/sec
Pixel Rate 13800 Mpixels/sec 12400 Mpixels/sec
Unified Shaders 128 320(64x5)
Texture Mapping Units 64 16
Render Output Units 24 16
Bus Type GDDR3 GDDR4
Bus Width 384-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 maximum amount of information (counted in megabytes per second) that can be transported over the external memory interface in one second. It is worked out by multiplying the bus width by its memory clock speed. If the card has DDR type memory, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

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

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

Display Prices

Hide Prices

GeForce 8800 GTX

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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