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GeForce GTX 1080 vs Radeon R9 390X 8G

Intro

The GeForce GTX 1080 features core speeds of 1607 MHz on the GPU, and 1251 MHz on the 8192 MB of GDDR5X RAM. It features 2560 SPUs along with 160 TAUs and 64 ROPs.

Compare all that to the Radeon R9 390X 8G, which features clock speeds of 1050 MHz on the GPU, and 1500 MHz on the 8192 MB of GDDR5 RAM. It features 2816 SPUs along with 176 TAUs and 64 Rasterization Operator Units.

Display Graphs

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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

In theory, the Radeon R9 390X 8G will be 17% faster than the GeForce GTX 1080 in general, because of its greater data rate. (explain)

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

Texel Rate

The GeForce GTX 1080 will be a lot (about 39%) faster with regards to 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

The GeForce GTX 1080 will be a lot (approximately 53%) more effective at AA than the Radeon R9 390X 8G, and capable of handling higher resolutions without losing too much performance. (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

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GeForce GTX 1080

Amazon.com

Radeon R9 390X 8G

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 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: Memory bandwidth is the maximum amount of information (counted in megabytes per second) that can be transferred over the external memory interface in a second. It's worked out by multiplying the card's interface width by the speed of its memory. In the case of DDR type RAM, it should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the card's memory bandwidth, the faster 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 can be applied in one second. This is worked out by multiplying the total texture units of the card by the core clock speed of the chip. The higher this number, the better the video card will be at handling 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 card can possibly record to the local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of Raster Operations Pipelines by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate is also dependant on quite a few other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.

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