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GeForce GTX 285 2GB vs Radeon HD 6790

Intro

The GeForce GTX 285 2GB makes use of a 55 nm design. nVidia has set the core frequency at 648 MHz. The GDDR3 RAM is set to run at a speed of 1242 MHz on this model. It features 240 SPUs as well as 80 Texture Address Units and 32 Rasterization Operator Units.

Compare those specifications to the Radeon HD 6790, which uses a 40 nm design. AMD has clocked the core frequency at 840 MHz. The GDDR5 memory runs at a frequency of 1050 MHz on this specific model. It features 800 SPUs as well as 40 Texture Address Units and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6790 150 Watts
GeForce GTX 285 2GB 204 Watts
Difference: 54 Watts (36%)

Memory Bandwidth

The GeForce GTX 285 2GB should in theory perform just a bit faster than the Radeon HD 6790 in general. (explain)

GeForce GTX 285 2GB 158976 MB/sec
Radeon HD 6790 134400 MB/sec
Difference: 24576 (18%)

Texel Rate

The GeForce GTX 285 2GB should be quite a bit (more or less 54%) better at AF than the Radeon HD 6790. (explain)

GeForce GTX 285 2GB 51840 Mtexels/sec
Radeon HD 6790 33600 Mtexels/sec
Difference: 18240 (54%)

Pixel Rate

The GeForce GTX 285 2GB should be quite a bit (about 54%) more effective at AA than the Radeon HD 6790, and will be able to handle higher screen resolutions without losing too much performance. (explain)

GeForce GTX 285 2GB 20736 Mpixels/sec
Radeon HD 6790 13440 Mpixels/sec
Difference: 7296 (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

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Radeon HD 6790

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 6790
Manufacturer nVidia AMD
Year January 15, 2009 April 2011
Code Name G200b Barts LE
Memory 2048 MB 1024 MB
Core Speed 648 MHz 840 MHz
Memory Speed 2484 MHz 4200 MHz
Power (Max TDP) 204 watts 150 watts
Bandwidth 158976 MB/sec 134400 MB/sec
Texel Rate 51840 Mtexels/sec 33600 Mtexels/sec
Pixel Rate 20736 Mpixels/sec 13440 Mpixels/sec
Unified Shaders 240 800
Texture Mapping Units 80 40
Render Output Units 32 16
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 2.1 x16
DirectX Version DirectX 10 DirectX 11
OpenGL Version OpenGL 3.1 OpenGL 4.1

Memory Bandwidth: Memory bandwidth is the largest amount of information (measured in megabytes per second) that can be moved past the external memory interface in one second. It's worked out by multiplying the card's bus width by the speed of its memory. If the card has DDR type memory, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the faster the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed per second. This is calculated by multiplying the total texture units by the core clock speed of the chip. The higher 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 most pixels the video card can possibly record to the local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate is also dependant on many other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the max fill rate.

Display Prices

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GeForce GTX 285 2GB

Amazon.com

Check prices at:

Radeon HD 6790

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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