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GeForce GTX 580 3GB vs Radeon HD 6990

Intro

The GeForce GTX 580 3GB uses a 40 nm design. nVidia has set the core speed at 772 MHz. The GDDR5 RAM works at a frequency of 1002 MHz on this specific model. It features 512 SPUs as well as 64 Texture Address Units and 48 Rasterization Operator Units.

Compare those specifications to the Radeon HD 6990, which comes with core speeds of 830 MHz on the GPU, and 1250 MHz on the 2048 MB of GDDR5 memory. It features 1536 SPUs along with 96 Texture Address Units and 32 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 580 3GB 244 Watts
Radeon HD 6990 375 Watts
Difference: 131 Watts (54%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 6990 should perform a lot faster than the GeForce GTX 580 3GB overall. (explain)

Radeon HD 6990 320000 MB/sec
GeForce GTX 580 3GB 192384 MB/sec
Difference: 127616 (66%)

Texel Rate

The Radeon HD 6990 will be much (about 223%) faster with regards to anisotropic filtering than the GeForce GTX 580 3GB. (explain)

Radeon HD 6990 159360 Mtexels/sec
GeForce GTX 580 3GB 49408 Mtexels/sec
Difference: 109952 (223%)

Pixel Rate

If using a high resolution is important to you, then the Radeon HD 6990 is the winner, and very much so. (explain)

Radeon HD 6990 53120 Mpixels/sec
GeForce GTX 580 3GB 37056 Mpixels/sec
Difference: 16064 (43%)

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 580 3GB

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 580 3GB Radeon HD 6990
Manufacturer nVidia AMD
Year November 2010 March 2011
Code Name GF110 Antilles
Memory 3072 MB 2048 MB (x2)
Core Speed 772 MHz 830 MHz (x2)
Memory Speed 4008 MHz 5000 MHz (x2)
Power (Max TDP) 244 watts 375 watts
Bandwidth 192384 MB/sec 320000 MB/sec
Texel Rate 49408 Mtexels/sec 159360 Mtexels/sec
Pixel Rate 37056 Mpixels/sec 53120 Mpixels/sec
Unified Shaders 512 1536 (x2)
Texture Mapping Units 64 96 (x2)
Render Output Units 48 32 (x2)
Bus Type GDDR5 GDDR5
Bus Width 384-bit 256-bit (x2)
Fab Process 40 nm 40 nm
Transistors 3000 million 2640 million
Bus PCIe x16 PCIe 2.1 x16
DirectX Version DirectX 11 DirectX 11
OpenGL Version OpenGL 4.1 OpenGL 4.1

Memory Bandwidth: Bandwidth is the largest amount of information (counted in MB per second) that can be transported past the external memory interface in a second. The number is calculated by multiplying the interface width by its memory speed. In the case of DDR type RAM, it must be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip could possibly record to its local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate is also dependant 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 580 3GB

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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