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GeForce GTX 280 vs Radeon HD 6990

Intro

The GeForce GTX 280 has a GPU core clock speed of 602 MHz, and the 1024 MB of GDDR3 RAM is set to run at 1107 MHz through a 512-bit bus. It also is made up of 240 SPUs, 80 TAUs, and 32 ROPs.

Compare that to the Radeon HD 6990, which comes with a core clock frequency of 830 MHz and a GDDR5 memory speed of 1250 MHz. It also uses a 256-bit memory bus, and makes use of a 40 nm design. It 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 280 236 Watts
Radeon HD 6990 375 Watts
Difference: 139 Watts (59%)

Memory Bandwidth

As far as performance goes, the Radeon HD 6990 should in theory be much better than the GeForce GTX 280 overall. (explain)

Radeon HD 6990 320000 MB/sec
GeForce GTX 280 141696 MB/sec
Difference: 178304 (126%)

Texel Rate

The Radeon HD 6990 will be a lot (more or less 231%) faster with regards to texture filtering than the GeForce GTX 280. (explain)

Radeon HD 6990 159360 Mtexels/sec
GeForce GTX 280 48160 Mtexels/sec
Difference: 111200 (231%)

Pixel Rate

The Radeon HD 6990 should be much (more or less 176%) better at FSAA than the GeForce GTX 280, and also able to handle higher resolutions without losing too much performance. (explain)

Radeon HD 6990 53120 Mpixels/sec
GeForce GTX 280 19264 Mpixels/sec
Difference: 33856 (176%)

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 280

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 280 Radeon HD 6990
Manufacturer nVidia AMD
Year June 17, 2008 March 2011
Code Name G200 Antilles
Memory 1024 MB 2048 MB (x2)
Core Speed 602 MHz 830 MHz (x2)
Memory Speed 2214 MHz 5000 MHz (x2)
Power (Max TDP) 236 watts 375 watts
Bandwidth 141696 MB/sec 320000 MB/sec
Texel Rate 48160 Mtexels/sec 159360 Mtexels/sec
Pixel Rate 19264 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 65 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 maximum amount of data (counted in megabytes per second) that can be transported past the external memory interface within a second. The number is worked out by multiplying the interface width by its memory speed. In the case of DDR RAM, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the card's 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 amount of texture map elements (texels) that are applied in one second. This number is calculated by multiplying the total amount of texture units by the core clock speed of the chip. The higher the texel rate, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

Pixel Rate: Pixel rate is the most pixels the graphics card could possibly write to the local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the number of Raster Operations Pipelines by the the card's 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 output rate is also dependant on lots of other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the max fill rate.

Display Prices

Hide Prices

GeForce GTX 280

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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