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GeForce GTX 285 2GB vs Radeon HD 6870

Intro

The GeForce GTX 285 2GB comes with a clock speed of 648 MHz and a GDDR3 memory frequency of 1242 MHz. It also features a 512-bit memory bus, and makes use of a 55 nm design. It is made up of 240 SPUs, 80 Texture Address Units, and 32 Raster Operation Units.

Compare that to the Radeon HD 6870, which uses a 40 nm design. AMD has set the core frequency at 900 MHz. The GDDR5 memory runs at a frequency of 1050 MHz on this particular card. It features 1120 SPUs along with 56 Texture Address Units and 32 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6870 151 Watts
GeForce GTX 285 2GB 204 Watts
Difference: 53 Watts (35%)

Memory Bandwidth

As far as performance goes, the GeForce GTX 285 2GB should theoretically be a bit superior to the Radeon HD 6870 overall. (explain)

GeForce GTX 285 2GB 158976 MB/sec
Radeon HD 6870 134400 MB/sec
Difference: 24576 (18%)

Texel Rate

The GeForce GTX 285 2GB will be just a bit (more or less 3%) faster with regards to texture filtering than the Radeon HD 6870. (explain)

GeForce GTX 285 2GB 51840 Mtexels/sec
Radeon HD 6870 50400 Mtexels/sec
Difference: 1440 (3%)

Pixel Rate

If running with high levels of AA is important to you, then the Radeon HD 6870 is the winner, by a large margin. (explain)

Radeon HD 6870 28800 Mpixels/sec
GeForce GTX 285 2GB 20736 Mpixels/sec
Difference: 8064 (39%)

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

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Radeon HD 6870

Amazon.com

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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 6870
Manufacturer nVidia AMD
Year January 15, 2009 October 2010
Code Name G200b Barts XT
Memory 2048 MB 1024 MB
Core Speed 648 MHz 900 MHz
Memory Speed 2484 MHz 4200 MHz
Power (Max TDP) 204 watts 151 watts
Bandwidth 158976 MB/sec 134400 MB/sec
Texel Rate 51840 Mtexels/sec 50400 Mtexels/sec
Pixel Rate 20736 Mpixels/sec 28800 Mpixels/sec
Unified Shaders 240 1120
Texture Mapping Units 80 56
Render Output Units 32 32
Bus Type GDDR3 GDDR5
Bus Width 512-bit 256-bit
Fab Process 55 nm 40 nm
Transistors 1400 million 1700 million
Bus PCIe x16 2.0 PCIe x16
DirectX Version DirectX 10 DirectX 11
OpenGL Version OpenGL 3.1 OpenGL 4.1

Memory Bandwidth: Bandwidth is the max amount of data (measured in MB per second) that can be moved past the external memory interface in a second. It's worked out by multiplying the interface width by its memory clock speed. In the case of DDR RAM, the result should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the bandwidth is, the better the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are applied in one second. This figure is calculated by multiplying the total texture units by the core speed of the chip. The better the texel rate, the better the video card will be at handling 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 that the graphics card can possibly write to the local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the number of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on many other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.

Display Prices

Hide Prices

GeForce GTX 285 2GB

Amazon.com

Check prices at:

Radeon HD 6870

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.

Comments

One Response to “GeForce GTX 285 2GB vs Radeon HD 6870”
GTX 295 - Warto? - Overclocking Forum - OCForum.pl says:

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