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GeForce GTX 285 1GB vs Radeon HD 3870 X2 1GB

Intro

The GeForce GTX 285 1GB comes with a core clock speed of 648 MHz and a GDDR3 memory speed of 1242 MHz. It also features a 512-bit memory bus, and makes use of a 55 nm design. It features 240 SPUs, 80 Texture Address Units, and 32 Raster Operation Units.

Compare those specifications to the Radeon HD 3870 X2 1GB, which features clock speeds of 825 MHz on the GPU, and 1126 MHz on the 1024 MB of GDDR4 memory. It features 320(64x5) SPUs as well as 16 TAUs and 16 Rasterization Operator Units.

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

Theoretically speaking, the GeForce GTX 285 1GB is 10% faster than the Radeon HD 3870 X2 1GB in general, due to its higher data rate. (explain)

GeForce GTX 285 1GB 158976 MB/sec
Radeon HD 3870 X2 1GB 144128 MB/sec
Difference: 14848 (10%)

Texel Rate

The GeForce GTX 285 1GB is much (approximately 96%) more effective at anisotropic filtering than the Radeon HD 3870 X2 1GB. (explain)

GeForce GTX 285 1GB 51840 Mtexels/sec
Radeon HD 3870 X2 1GB 26400 Mtexels/sec
Difference: 25440 (96%)

Pixel Rate

The Radeon HD 3870 X2 1GB is quite a bit (more or less 27%) faster with regards to FSAA than the GeForce GTX 285 1GB, and also able to handle higher screen resolutions more effectively. (explain)

Radeon HD 3870 X2 1GB 26400 Mpixels/sec
GeForce GTX 285 1GB 20736 Mpixels/sec
Difference: 5664 (27%)

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.

One or more cards in this comparison are multi-core. This means that their bandwidth, texel and pixel rates are theoretically doubled - this does not mean the card will actually perform twice as fast, but only that it should in theory be able to. Actual game benchmarks will give a more accurate idea of what it's capable of.

Price Comparison

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GeForce GTX 285 1GB

Amazon.com

Check prices at:

Radeon HD 3870 X2 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 GTX 285 1GB Radeon HD 3870 X2 1GB
Manufacturer nVidia AMD
Year January 15, 2009 Jan 28, 2008
Code Name G200b R680
Memory 1024 MB 1024 MB (x2)
Core Speed 648 MHz 825 MHz (x2)
Memory Speed 2484 MHz 2252 MHz (x2)
Power (Max TDP) 204 watts (Unknown) watts
Bandwidth 158976 MB/sec 144128 MB/sec
Texel Rate 51840 Mtexels/sec 26400 Mtexels/sec
Pixel Rate 20736 Mpixels/sec 26400 Mpixels/sec
Unified Shaders 240 320(64x5) (x2)
Texture Mapping Units 80 16 (x2)
Render Output Units 32 16 (x2)
Bus Type GDDR3 GDDR4
Bus Width 512-bit 256-bit (x2)
Fab Process 55 nm 55 nm
Transistors 1400 million (Unknown) million
Bus PCIe x16 2.0 PCIe 2.0 x16/(internal PCIe 1.1 x16)
DirectX Version DirectX 10 DirectX 10.1
OpenGL Version OpenGL 3.1 OpenGL 3.0

Memory Bandwidth: Memory bandwidth is the max amount of data (in units of MB per second) that can be transported over the external memory interface within a second. It is calculated by multiplying the card's interface width by its memory clock speed. In the case of DDR type memory, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip can possibly write to its local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the number of Raster Operations Pipelines 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 also depends on many other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the max fill rate.

Display Prices

Hide Prices

GeForce GTX 285 1GB

Amazon.com

Check prices at:

Radeon HD 3870 X2 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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