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Geforce GTX 670 vs Radeon HD 7990

Intro

The Geforce GTX 670 uses a 28 nm design. nVidia has set the core frequency at 915 MHz. The GDDR5 RAM runs at a frequency of 1500 MHz on this specific model. It features 1344 SPUs as well as 112 Texture Address Units and 32 Rasterization Operator Units.

Compare all that to the Radeon HD 7990, which makes use of a 28 nm design. AMD has set the core frequency at 950 MHz. The GDDR5 RAM runs at a speed of 1500 MHz on this model. It features 2048 SPUs along with 128 Texture Address Units and 32 Rasterization Operator Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Geforce GTX 670 170 Watts
Radeon HD 7990 375 Watts
Difference: 205 Watts (121%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 7990 is 200% quicker than the Geforce GTX 670 overall, because of its higher data rate. (explain)

Radeon HD 7990 576000 MB/sec
Geforce GTX 670 192000 MB/sec
Difference: 384000 (200%)

Texel Rate

The Radeon HD 7990 should be much (more or less 137%) better at texture filtering than the Geforce GTX 670. (explain)

Radeon HD 7990 243200 Mtexels/sec
Geforce GTX 670 102480 Mtexels/sec
Difference: 140720 (137%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the Radeon HD 7990 is a better choice, by a large margin. (explain)

Radeon HD 7990 60800 Mpixels/sec
Geforce GTX 670 29280 Mpixels/sec
Difference: 31520 (108%)

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 670

Amazon.com

Radeon HD 7990

Amazon.com

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 670 Radeon HD 7990
Manufacturer nVidia AMD
Year May 2012 April 2013
Code Name GK104 Malta
Memory 2048 MB 3072 MB (x2)
Core Speed 915 MHz 950 MHz (x2)
Memory Speed 6000 MHz 6000 MHz (x2)
Power (Max TDP) 170 watts 375 watts
Bandwidth 192000 MB/sec 576000 MB/sec
Texel Rate 102480 Mtexels/sec 243200 Mtexels/sec
Pixel Rate 29280 Mpixels/sec 60800 Mpixels/sec
Unified Shaders 1344 2048 (x2)
Texture Mapping Units 112 128 (x2)
Render Output Units 32 32 (x2)
Bus Type GDDR5 GDDR5
Bus Width 256-bit 384-bit (x2)
Fab Process 28 nm 28 nm
Transistors 3540 million 4313 million
Bus PCIe 3.0 x16 PCIe 3.0 x16
DirectX Version DirectX 11.0 DirectX 11.1
OpenGL Version OpenGL 4.2 OpenGL 4.3

Memory Bandwidth: Memory bandwidth is the maximum amount of information (in units of megabytes per second) that can be transferred over the external memory interface in a second. It is worked out by multiplying the card's bus width by its memory clock speed. If it uses DDR type RAM, the result should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the bandwidth is, the better the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the most pixels the graphics card can possibly write to its local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of Render Output Units by the clock speed of the card. ROPs (Raster Operations Pipelines - aka 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, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.

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