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GeForce GTX 1080 vs Radeon HD 6990

Intro

The GeForce GTX 1080 features a clock speed of 1607 MHz and a GDDR5X memory speed of 1251 MHz. It also features a 256-bit bus, and uses a 16 nm design. It is comprised of 2560 SPUs, 160 Texture Address Units, and 64 ROPs.

Compare that to the Radeon HD 6990, which has core speeds of 830 MHz on the GPU, and 1250 MHz on the 2048 MB of GDDR5 memory. It features 1536 SPUs as well as 96 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

GeForce GTX 1080 21942 points
Radeon HD 6990 5820 points
Difference: 16122 (277%)

Ethereum Mining Hash Rate

Radeon HD 6990 24 Mh/s
GeForce GTX 1080 20 Mh/s
Difference: 4 (20%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 1080 180 Watts
Radeon HD 6990 375 Watts
Difference: 195 Watts (108%)

Memory Bandwidth

In theory, the GeForce GTX 1080 is 2% quicker than the Radeon HD 6990 overall, because of its greater data rate. (explain)

GeForce GTX 1080 327680 MB/sec
Radeon HD 6990 320000 MB/sec
Difference: 7680 (2%)

Texel Rate

The GeForce GTX 1080 is a lot (approximately 61%) more effective at AF than the Radeon HD 6990. (explain)

GeForce GTX 1080 257120 Mtexels/sec
Radeon HD 6990 159360 Mtexels/sec
Difference: 97760 (61%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the GeForce GTX 1080 is the winner, by far. (explain)

GeForce GTX 1080 102848 Mpixels/sec
Radeon HD 6990 53120 Mpixels/sec
Difference: 49728 (94%)

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 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 1080 Radeon HD 6990
Manufacturer nVidia AMD
Year May 2016 March 2011
Code Name GP104-400 Antilles
Memory 8192 MB 2048 MB (x2)
Core Speed 1607 MHz 830 MHz (x2)
Memory Speed 10008 MHz 5000 MHz (x2)
Power (Max TDP) 180 watts 375 watts
Bandwidth 327680 MB/sec 320000 MB/sec
Texel Rate 257120 Mtexels/sec 159360 Mtexels/sec
Pixel Rate 102848 Mpixels/sec 53120 Mpixels/sec
Unified Shaders 2560 1536 (x2)
Texture Mapping Units 160 96 (x2)
Render Output Units 64 32 (x2)
Bus Type GDDR5X GDDR5
Bus Width 256-bit 256-bit (x2)
Fab Process 16 nm 40 nm
Transistors 7200 million 2640 million
Bus PCIe 3.0 x16 PCIe 2.1 x16
DirectX Version DirectX 12.0 DirectX 11
OpenGL Version OpenGL 4.5 OpenGL 4.1

Memory Bandwidth: Bandwidth is the maximum amount of information (counted in MB per second) that can be moved past the external memory interface in a second. It's calculated by multiplying the interface width by the speed of its memory. If the card has DDR RAM, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of 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 amount of Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate also depends on quite a few other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.

Display Prices

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GeForce GTX 1080

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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