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GeForce GTX 285 2GB vs Radeon HD 6990

Intro

The GeForce GTX 285 2GB has clock speeds of 648 MHz on the GPU, and 1242 MHz on the 2048 MB of GDDR3 RAM. It features 240 SPUs along with 80 Texture Address Units and 32 Rasterization Operator Units.

Compare those specs to the Radeon HD 6990, which uses a 40 nm design. AMD has clocked the core frequency at 830 MHz. The GDDR5 memory runs at a frequency of 1250 MHz on this particular model. It features 1536 SPUs as well as 96 TAUs and 32 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 285 2GB 204 Watts
Radeon HD 6990 375 Watts
Difference: 171 Watts (84%)

Memory Bandwidth

The Radeon HD 6990, in theory, should perform quite a bit faster than the GeForce GTX 285 2GB in general. (explain)

Radeon HD 6990 320000 MB/sec
GeForce GTX 285 2GB 158976 MB/sec
Difference: 161024 (101%)

Texel Rate

The Radeon HD 6990 will be quite a bit (about 207%) better at anisotropic filtering than the GeForce GTX 285 2GB. (explain)

Radeon HD 6990 159360 Mtexels/sec
GeForce GTX 285 2GB 51840 Mtexels/sec
Difference: 107520 (207%)

Pixel Rate

The Radeon HD 6990 should be much (about 156%) more effective at AA than the GeForce GTX 285 2GB, and also should be capable of handling higher resolutions while still performing well. (explain)

Radeon HD 6990 53120 Mpixels/sec
GeForce GTX 285 2GB 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 2GB

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 2GB Radeon HD 6990
Manufacturer nVidia AMD
Year January 15, 2009 March 2011
Code Name G200b Antilles
Memory 2048 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: Memory bandwidth is the largest amount of information (measured in MB per second) that can be moved over the external memory interface in a second. The number is calculated by multiplying the bus width by the speed of its memory. If it uses DDR RAM, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are applied in one second. This number 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 handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card could possibly write to its 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 - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate is also dependant on lots of other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.

Display Prices

Hide Prices

GeForce GTX 285 2GB

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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