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GeForce GTX 580 3GB vs Radeon HD 6990

Intro

The GeForce GTX 580 3GB has clock speeds of 772 MHz on the GPU, and 1002 MHz on the 3072 MB of GDDR5 RAM. It features 512 SPUs along with 64 Texture Address Units and 48 Rasterization Operator Units.

Compare those specs to the Radeon HD 6990, which features GPU core speed of 830 MHz, and 2048 MB of GDDR5 memory running at 1250 MHz through a 256-bit bus. It also features 1536 SPUs, 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

In theory, the Radeon HD 6990 will be 66% quicker than the GeForce GTX 580 3GB overall, because of its greater data rate. (explain)

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

Texel Rate

The Radeon HD 6990 should be quite a bit (about 223%) more effective at AF 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

The Radeon HD 6990 should be quite a bit (approximately 43%) more effective at FSAA than the GeForce GTX 580 3GB, and also should be able to handle higher resolutions while still performing well. (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: Memory bandwidth is the maximum amount of data (counted in megabytes per second) that can be transported over the external memory interface in one second. It is worked out by multiplying the card's interface width by the speed of its memory. In the case of DDR type memory, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the memory bandwidth, 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 amount of texture map elements (texels) that can be processed in one second. This figure is worked out by multiplying the total number of texture units by the core speed of the chip. The better this number, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card can possibly record to its local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of Render Output Units by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate also depends on quite a few other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to get to 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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