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GeForce GTX 285 2GB vs Radeon HD 3870 X2 1GB

Intro

The GeForce GTX 285 2GB features clock speeds of 648 MHz on the GPU, and 1242 MHz on the 2048 MB of GDDR3 RAM. It features 240 SPUs as well as 80 TAUs and 32 ROPs.

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

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

Theoretically speaking, the GeForce GTX 285 2GB should perform a bit faster than the Radeon HD 3870 X2 1GB overall. (explain)

GeForce GTX 285 2GB 158976 MB/sec
Radeon HD 3870 X2 1GB 144128 MB/sec
Difference: 14848 (10%)

Texel Rate

The GeForce GTX 285 2GB should be a lot (approximately 96%) better at AF than the Radeon HD 3870 X2 1GB. (explain)

GeForce GTX 285 2GB 51840 Mtexels/sec
Radeon HD 3870 X2 1GB 26400 Mtexels/sec
Difference: 25440 (96%)

Pixel Rate

The Radeon HD 3870 X2 1GB will be much (about 27%) faster with regards to FSAA than the GeForce GTX 285 2GB, and also capable of handling higher screen resolutions more effectively. (explain)

Radeon HD 3870 X2 1GB 26400 Mpixels/sec
GeForce GTX 285 2GB 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 2GB

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 2GB Radeon HD 3870 X2 1GB
Manufacturer nVidia AMD
Year January 15, 2009 Jan 28, 2008
Code Name G200b R680
Memory 2048 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: Bandwidth is the maximum amount of data (counted in MB per second) that can be transported across the external memory interface in one second. It is calculated by multiplying the bus width by the speed of its memory. If it uses DDR memory, it should be multiplied by 2 once again. If it uses 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 amount of texture map elements (texels) that are applied per second. This is calculated by multiplying the total texture units by the core speed of the chip. The higher the texel rate, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

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

Display Prices

Hide Prices

GeForce GTX 285 2GB

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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