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GeForce 8800 GTX vs Radeon HD 3870 1GB

Intro

The GeForce 8800 GTX features a clock frequency of 575 MHz and a GDDR3 memory frequency of 900 MHz. It also features a 384-bit bus, and makes use of a 90 nm design. It is comprised of 128 SPUs, 64 TAUs, and 24 ROPs.

Compare those specs to the Radeon HD 3870 1GB, which uses a 55 nm design. AMD has clocked the core speed at 775 MHz. The GDDR4 memory is set to run at a frequency of 1125 MHz on this model. It features 320(64x5) SPUs along with 16 TAUs and 16 Rasterization Operator Units.

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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

The GeForce 8800 GTX, in theory, should be just a bit faster than the Radeon HD 3870 1GB overall. (explain)

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

Texel Rate

The GeForce 8800 GTX will be a lot (more or less 197%) better at texture filtering 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

The GeForce 8800 GTX should be a small bit (about 11%) faster with regards to FSAA than the Radeon HD 3870 1GB, and able to handle higher screen resolutions while still performing well. (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

Radeon HD 3870 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 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 largest amount of information (counted in MB per second) that can be moved past the external memory interface within a second. The number is worked out by multiplying the card's interface width by the speed of its memory. If it uses DDR RAM, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the bandwidth is, the better the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are applied per second. This is worked out by multiplying the total number of texture units of the card by the core clock speed of the chip. The higher the texel rate, the better the 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 maximum number of pixels that the graphics card can possibly write to the local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate is also dependant on lots of other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.

Display Prices

Hide Prices

GeForce 8800 GTX

Amazon.com

Radeon HD 3870 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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