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GeForce GTX 1080 vs Radeon R9 390X 8G

Intro

The GeForce GTX 1080 uses a 16 nm design. nVidia has set the core frequency at 1607 MHz. The GDDR5X memory is set to run at a frequency of 1251 MHz on this specific card. It features 2560 SPUs as well as 160 TAUs and 64 ROPs.

Compare that to the Radeon R9 390X 8G, which has GPU clock speed of 1050 MHz, and 8192 MB of GDDR5 RAM set to run at 1500 MHz through a 512-bit bus. It also is comprised of 2816 SPUs, 176 TAUs, and 64 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 22050 points
Radeon R9 390X 8G 13550 points
Difference: 8500 (63%)

Zcash Mining Hash Rate

GeForce GTX 1080 553 Sol/s
Radeon R9 390X 8G 330 Sol/s
Difference: 223 (68%)

Ethereum Mining Hash Rate

Radeon R9 390X 8G 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 R9 390X 8G 275 Watts
Difference: 95 Watts (53%)

Memory Bandwidth

Theoretically speaking, the Radeon R9 390X 8G should be a bit faster than the GeForce GTX 1080 in general. (explain)

Radeon R9 390X 8G 384000 MB/sec
GeForce GTX 1080 327680 MB/sec
Difference: 56320 (17%)

Texel Rate

The GeForce GTX 1080 is quite a bit (approximately 39%) more effective at anisotropic filtering than the Radeon R9 390X 8G. (explain)

GeForce GTX 1080 257120 Mtexels/sec
Radeon R9 390X 8G 184800 Mtexels/sec
Difference: 72320 (39%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the GeForce GTX 1080 is superior to the Radeon R9 390X 8G, by a large margin. (explain)

GeForce GTX 1080 102848 Mpixels/sec
Radeon R9 390X 8G 67200 Mpixels/sec
Difference: 35648 (53%)

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.

Price Comparison

GeForce GTX 1080

Radeon R9 390X 8G

Specifications

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Model GeForce GTX 1080 Radeon R9 390X 8G
Manufacturer nVidia AMD
Year May 2016 June 2015
Code Name GP104-400 Grenada XT
Memory 8192 MB 8192 MB
Core Speed 1607 MHz 1050 MHz
Memory Speed 10008 MHz 6000 MHz
Power (Max TDP) 180 watts 275 watts
Bandwidth 327680 MB/sec 384000 MB/sec
Texel Rate 257120 Mtexels/sec 184800 Mtexels/sec
Pixel Rate 102848 Mpixels/sec 67200 Mpixels/sec
Unified Shaders 2560 2816
Texture Mapping Units 160 176
Render Output Units 64 64
Bus Type GDDR5X GDDR5
Bus Width 256-bit 512-bit
Fab Process 16 nm 28 nm
Transistors 7200 million 6200 million
Bus PCIe 3.0 x16 PCIe 3.0 ×16
DirectX Version DirectX 12.0 DirectX 12.0
OpenGL Version OpenGL 4.5 OpenGL 4.5

Memory Bandwidth: Bandwidth is the max amount of data (in units of megabytes per second) that can be transferred across the external memory interface within a second. It is worked out by multiplying the bus width by its memory speed. In the case of DDR RAM, it should be multiplied by 2 once again. If 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, HDR and higher screen 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 of the card by the core speed of the chip. The better the texel rate, the better the 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 maximum amount of pixels that the graphics card can possibly record to the local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. 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.

GeForce GTX 1080

Radeon R9 390X 8G

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