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

Intro

The GeForce GTX 285 1GB comes with a GPU clock speed of 648 MHz, and the 1024 MB of GDDR3 memory is set to run at 1242 MHz through a 512-bit bus. It also features 240 Stream Processors, 80 TAUs, and 32 Raster Operation Units.

Compare all of that to the Radeon HD 3870 X2 1GB, which comes with GPU clock speed of 825 MHz, and 1024 MB of GDDR4 RAM running at 1126 MHz through a 256-bit bus. It also is comprised of 320(64x5) Stream Processors, 16 Texture Address Units, and 16 Raster Operation Units.

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

As far as performance goes, the GeForce GTX 285 1GB should theoretically be a small bit better than the Radeon HD 3870 X2 1GB in general. (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 will be a lot (approximately 96%) more effective at texture 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 should be much (about 27%) better at AA than the GeForce GTX 285 1GB, and also able to handle higher screen resolutions better. (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 information (measured in MB per second) that can be moved past the external memory interface within a second. It's worked out by multiplying the interface width by its memory clock speed. In the case of DDR memory, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. 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 amount of texture map elements (texels) that can be applied per second. This is calculated by multiplying the total amount of texture units of the card by the core clock speed of the chip. The better the texel rate, the better the video 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 record to its local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the number of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as 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, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to 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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