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

Intro

The GeForce GTX 285 2GB comes with a GPU core clock speed of 648 MHz, and the 2048 MB of GDDR3 memory is set to run at 1242 MHz through a 512-bit bus. It also is made up of 240 SPUs, 80 TAUs, and 32 ROPs.

Compare those specifications to the Radeon HD 3870 X2 1GB, which uses a 55 nm design. AMD has set the core speed at 825 MHz. The GDDR4 RAM is set to run at a speed of 1126 MHz on this model. It features 320(64x5) SPUs as well as 16 Texture Address Units and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

In theory, the GeForce GTX 285 2GB should be 10% faster than the Radeon HD 3870 X2 1GB in general, because of its greater bandwidth. (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 will be quite a bit (approximately 96%) faster with regards to 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 is quite a bit (about 27%) faster with regards to FSAA than the GeForce GTX 285 2GB, and also able to handle higher resolutions without losing too much performance. (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 max amount of information (counted in MB per second) that can be transported across the external memory interface in one second. It is worked out by multiplying the card's interface width by the speed of its memory. In the case of DDR type memory, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the bandwidth is, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are processed in one second. This is worked out by multiplying the total number of texture units by the core speed of the chip. The better this number, the better the graphics 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 could possibly record to the local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of Render Output Units by the the core 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 is also dependant on many other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to 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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