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GeForce GTX 1080 vs Radeon HD 7990

Intro

The GeForce GTX 1080 features a core clock speed of 1607 MHz and a GDDR5X memory speed of 1251 MHz. It also makes use of a 256-bit bus, and uses a 16 nm design. It features 2560 SPUs, 160 TAUs, and 64 ROPs.

Compare those specifications to the Radeon HD 7990, which has a core clock frequency of 950 MHz and a GDDR5 memory speed of 1500 MHz. It also features a 384-bit bus, and makes use of a 28 nm design. It features 2048 SPUs, 128 TAUs, and 32 Raster Operation Units.

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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

GeForce GTX 1080 21942 points
Radeon HD 7990 15520 points
Difference: 6422 (41%)

Zcash Mining Hash Rate

GeForce GTX 1080 553 Sol/s
Radeon HD 7990 513 Sol/s
Difference: 40 (8%)

Ethereum Mining Hash Rate

Radeon HD 7990 32 Mh/s
GeForce GTX 1080 20 Mh/s
Difference: 12 (60%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 1080 180 Watts
Radeon HD 7990 375 Watts
Difference: 195 Watts (108%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 7990 should be 76% quicker than the GeForce GTX 1080 overall, due to its greater bandwidth. (explain)

Radeon HD 7990 576000 MB/sec
GeForce GTX 1080 327680 MB/sec
Difference: 248320 (76%)

Texel Rate

The GeForce GTX 1080 is a little bit (approximately 6%) faster with regards to anisotropic filtering than the Radeon HD 7990. (explain)

GeForce GTX 1080 257120 Mtexels/sec
Radeon HD 7990 243200 Mtexels/sec
Difference: 13920 (6%)

Pixel Rate

The GeForce GTX 1080 should be quite a bit (more or less 69%) more effective at FSAA than the Radeon HD 7990, and also will be capable of handling higher resolutions without losing too much performance. (explain)

GeForce GTX 1080 102848 Mpixels/sec
Radeon HD 7990 60800 Mpixels/sec
Difference: 42048 (69%)

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 1080

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 1080 Radeon HD 7990
Manufacturer nVidia AMD
Year May 2016 April 2013
Code Name GP104-400 Malta
Memory 8192 MB 3072 MB (x2)
Core Speed 1607 MHz 950 MHz (x2)
Memory Speed 10008 MHz 6000 MHz (x2)
Power (Max TDP) 180 watts 375 watts
Bandwidth 327680 MB/sec 576000 MB/sec
Texel Rate 257120 Mtexels/sec 243200 Mtexels/sec
Pixel Rate 102848 Mpixels/sec 60800 Mpixels/sec
Unified Shaders 2560 2048 (x2)
Texture Mapping Units 160 128 (x2)
Render Output Units 64 32 (x2)
Bus Type GDDR5X GDDR5
Bus Width 256-bit 384-bit (x2)
Fab Process 16 nm 28 nm
Transistors 7200 million 4313 million
Bus PCIe 3.0 x16 PCIe 3.0 x16
DirectX Version DirectX 12.0 DirectX 11.1
OpenGL Version OpenGL 4.5 OpenGL 4.3

Memory Bandwidth: Memory bandwidth is the maximum amount of information (in units of MB per second) that can be moved across the external memory interface in a second. The number is worked out by multiplying the interface width by its memory speed. In the case of DDR type RAM, the result should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be applied per second. This figure is worked out by multiplying the total texture units by the core speed of the chip. The better this number, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip could possibly write to the local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate also depends on lots of other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.

Display Prices

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GeForce GTX 1080

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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