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GeForce GTX 285 1GB vs Radeon HD 6990

Intro

The GeForce GTX 285 1GB 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 speed of 1242 MHz on this particular model. It features 240 SPUs along with 80 Texture Address Units and 32 Rasterization Operator Units.

Compare that to the Radeon HD 6990, which has GPU clock speed of 830 MHz, and 2048 MB of GDDR5 memory running at 1250 MHz through a 256-bit bus. It also is made up of 1536 SPUs, 96 Texture Address Units, and 32 Raster Operation Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 285 1GB 204 Watts
Radeon HD 6990 375 Watts
Difference: 171 Watts (84%)

Memory Bandwidth

The Radeon HD 6990 should in theory perform much faster than the GeForce GTX 285 1GB in general. (explain)

Radeon HD 6990 320000 MB/sec
GeForce GTX 285 1GB 158976 MB/sec
Difference: 161024 (101%)

Texel Rate

The Radeon HD 6990 should be a lot (about 207%) faster with regards to AF than the GeForce GTX 285 1GB. (explain)

Radeon HD 6990 159360 Mtexels/sec
GeForce GTX 285 1GB 51840 Mtexels/sec
Difference: 107520 (207%)

Pixel Rate

The Radeon HD 6990 should be much (about 156%) better at anti-aliasing than the GeForce GTX 285 1GB, and should be able to handle higher resolutions without slowing down too much. (explain)

Radeon HD 6990 53120 Mpixels/sec
GeForce GTX 285 1GB 20736 Mpixels/sec
Difference: 32384 (156%)

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 6990

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 6990
Manufacturer nVidia AMD
Year January 15, 2009 March 2011
Code Name G200b Antilles
Memory 1024 MB 2048 MB (x2)
Core Speed 648 MHz 830 MHz (x2)
Memory Speed 2484 MHz 5000 MHz (x2)
Power (Max TDP) 204 watts 375 watts
Bandwidth 158976 MB/sec 320000 MB/sec
Texel Rate 51840 Mtexels/sec 159360 Mtexels/sec
Pixel Rate 20736 Mpixels/sec 53120 Mpixels/sec
Unified Shaders 240 1536 (x2)
Texture Mapping Units 80 96 (x2)
Render Output Units 32 32 (x2)
Bus Type GDDR3 GDDR5
Bus Width 512-bit 256-bit (x2)
Fab Process 55 nm 40 nm
Transistors 1400 million 2640 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: Bandwidth is the max amount of data (counted in megabytes per second) that can be transferred across the external memory interface within a second. It is worked out by multiplying the interface width by the speed of its memory. In the case of DDR type RAM, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed 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 card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card could possibly write to its local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the amount of Raster Operations Pipelines 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 output rate is also dependant on lots of other factors, especially 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 1GB

Amazon.com

Check prices at:

Radeon HD 6990

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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