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Geforce GTX 670 vs Radeon HD 7990

Intro

The Geforce GTX 670 makes use of a 28 nm design. nVidia has set the core speed at 915 MHz. The GDDR5 memory runs at a frequency of 1500 MHz on this model. It features 1344 SPUs as well as 112 TAUs and 32 ROPs.

Compare those specifications to the Radeon HD 7990, which features clock speeds of 950 MHz on the GPU, and 1500 MHz on the 3072 MB of GDDR5 RAM. It features 2048 SPUs along with 128 TAUs and 32 ROPs.

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Benchmarks

These are real-world performance benchmarks that were submitted by Hardware Compare users. The scores seen here are the average of all benchmarks submitted for each respective test and hardware.

3DMark Fire Strike Graphics Score

Radeon HD 7990 15520 points
Geforce GTX 670 7424 points
Difference: 8096 (109%)

Ethereum Mining Hash Rate

Radeon HD 7990 32 Mh/s
Geforce GTX 670 13 Mh/s
Difference: 19 (146%)

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

Performance-wise, the Radeon HD 7990 should in theory be much superior to the Geforce GTX 670 in general. (explain)

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

Texel Rate

The Radeon HD 7990 should be quite a bit (approximately 137%) faster with regards to anisotropic 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 the winner, by far. (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

Geforce GTX 670

Radeon HD 7990

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: Bandwidth is the largest amount of information (measured in megabytes per second) that can be transported past the external memory interface in one second. It is worked out by multiplying the card's bus width by its memory clock speed. If the card has DDR type memory, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be applied in one second. This figure is worked out by multiplying the total amount 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 in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card could possibly record to the local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of colour ROPs by the the core clock speed. 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 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 max fill rate.

Geforce GTX 670

Radeon HD 7990

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