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

Intro

The GeForce GTX 285 1GB comes with a GPU core 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 is comprised of 240 SPUs, 80 TAUs, and 32 Raster Operation Units.

Compare those specifications to the Radeon HD 3870 X2 1GB, which features a GPU core clock speed of 825 MHz, and 1024 MB of GDDR4 memory set to run at 1126 MHz through a 256-bit bus. It also is made up of 320(64x5) Stream Processors, 16 TAUs, and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

The GeForce GTX 285 1GB should theoretically perform a small bit faster 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 should be quite a bit (approximately 96%) faster with regards to AF 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 a lot (approximately 27%) faster with regards to AA than the GeForce GTX 285 1GB, and also will be capable of handling higher screen resolutions without losing too much performance. (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 largest amount of data (counted in megabytes per second) that can be moved across the external memory interface in one second. It's worked out by multiplying the interface width by its memory clock speed. If it uses DDR memory, it must be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the memory bandwidth, the faster 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 figure is calculated by multiplying the total texture units of the card by the core clock 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 per second.

Pixel Rate: Pixel rate is the most pixels the video card could possibly record to the local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of ROPs by the the core speed of the card. 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 output rate also depends on many 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 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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