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GeForce GTX 280 vs Radeon HD 7990

Intro

The GeForce GTX 280 features a core clock frequency of 602 MHz and a GDDR3 memory frequency of 1107 MHz. It also makes use of a 512-bit memory bus, and uses a 65 nm design. It is made up of 240 SPUs, 80 TAUs, and 32 Raster Operation Units.

Compare that to the Radeon HD 7990, which comes with core clock speeds of 950 MHz on the GPU, and 1500 MHz on the 3072 MB of GDDR5 memory. It features 2048 SPUs as well as 128 Texture Address Units and 32 Rasterization Operator Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 280 236 Watts
Radeon HD 7990 375 Watts
Difference: 139 Watts (59%)

Memory Bandwidth

The Radeon HD 7990 should theoretically perform a lot faster than the GeForce GTX 280 overall. (explain)

Radeon HD 7990 576000 MB/sec
GeForce GTX 280 141696 MB/sec
Difference: 434304 (307%)

Texel Rate

The Radeon HD 7990 is quite a bit (about 405%) better at AF than the GeForce GTX 280. (explain)

Radeon HD 7990 243200 Mtexels/sec
GeForce GTX 280 48160 Mtexels/sec
Difference: 195040 (405%)

Pixel Rate

If using a high resolution is important to you, then the Radeon HD 7990 is a better choice, by far. (explain)

Radeon HD 7990 60800 Mpixels/sec
GeForce GTX 280 19264 Mpixels/sec
Difference: 41536 (216%)

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 7990

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 7990
Manufacturer nVidia AMD
Year June 17, 2008 April 2013
Code Name G200 Malta
Memory 1024 MB 3072 MB (x2)
Core Speed 602 MHz 950 MHz (x2)
Memory Speed 2214 MHz 6000 MHz (x2)
Power (Max TDP) 236 watts 375 watts
Bandwidth 141696 MB/sec 576000 MB/sec
Texel Rate 48160 Mtexels/sec 243200 Mtexels/sec
Pixel Rate 19264 Mpixels/sec 60800 Mpixels/sec
Unified Shaders 240 2048 (x2)
Texture Mapping Units 80 128 (x2)
Render Output Units 32 32 (x2)
Bus Type GDDR3 GDDR5
Bus Width 512-bit 384-bit (x2)
Fab Process 65 nm 28 nm
Transistors 1400 million 4313 million
Bus PCIe x16 2.0 PCIe 3.0 x16
DirectX Version DirectX 10 DirectX 11.1
OpenGL Version OpenGL 3.1 OpenGL 4.3

Memory Bandwidth: Memory bandwidth is the max amount of information (measured in megabytes per second) that can be moved past the external memory interface within a second. It is calculated by multiplying the card's bus width by the speed of its memory. If it uses DDR memory, it should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the better the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are applied in one second. This number is calculated by multiplying the total 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 in one second.

Pixel Rate: Pixel rate is the most pixels that 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 amount of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on many other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the max fill rate.

Display Prices

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GeForce GTX 280

Amazon.com

Check prices at:

Radeon HD 7990

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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