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GeForce GTX 285 2GB vs Radeon HD 7870

Intro

The GeForce GTX 285 2GB makes use of a 55 nm design. nVidia has set the core frequency at 648 MHz. The GDDR3 memory is set to run at a frequency of 1242 MHz on this card. It features 240 SPUs along with 80 TAUs and 32 Rasterization Operator Units.

Compare all that to the Radeon HD 7870, which comes with a clock speed of 1000 MHz and a GDDR5 memory speed of 1200 MHz. It also uses a 256-bit bus, and uses a 28 nm design. It is made up of 1280 SPUs, 80 Texture Address Units, and 32 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7870 175 Watts
GeForce GTX 285 2GB 204 Watts
Difference: 29 Watts (17%)

Memory Bandwidth

The GeForce GTX 285 2GB, in theory, should perform a bit faster than the Radeon HD 7870 in general. (explain)

GeForce GTX 285 2GB 158976 MB/sec
Radeon HD 7870 153600 MB/sec
Difference: 5376 (4%)

Texel Rate

The Radeon HD 7870 is a lot (approximately 54%) better at anisotropic filtering than the GeForce GTX 285 2GB. (explain)

Radeon HD 7870 80000 Mtexels/sec
GeForce GTX 285 2GB 51840 Mtexels/sec
Difference: 28160 (54%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the Radeon HD 7870 is the winner, by a large margin. (explain)

Radeon HD 7870 32000 Mpixels/sec
GeForce GTX 285 2GB 20736 Mpixels/sec
Difference: 11264 (54%)

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.

Price Comparison

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GeForce GTX 285 2GB

Amazon.com

Check prices at:

Radeon HD 7870

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 7870
Manufacturer nVidia AMD
Year January 15, 2009 March 2012
Code Name G200b Pitcairn XT
Memory 2048 MB 2048 MB
Core Speed 648 MHz 1000 MHz
Memory Speed 2484 MHz 4800 MHz
Power (Max TDP) 204 watts 175 watts
Bandwidth 158976 MB/sec 153600 MB/sec
Texel Rate 51840 Mtexels/sec 80000 Mtexels/sec
Pixel Rate 20736 Mpixels/sec 32000 Mpixels/sec
Unified Shaders 240 1280
Texture Mapping Units 80 80
Render Output Units 32 32
Bus Type GDDR3 GDDR5
Bus Width 512-bit 256-bit
Fab Process 55 nm 28 nm
Transistors 1400 million 2800 million
Bus PCIe x16 2.0 PCIe 3.0 x16
DirectX Version DirectX 10 DirectX 11.1
OpenGL Version OpenGL 3.1 OpenGL 4.2

Memory Bandwidth: Memory bandwidth is the maximum amount of data (counted in megabytes per second) that can be transported over the external memory interface within a second. It's worked out by multiplying the bus width by its memory clock speed. In the case of DDR RAM, it should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels the video card could possibly write to its local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of colour ROPs by the clock 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 fill rate is also dependant 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 7870

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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