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GeForce GTX 1080 vs Radeon R9 390X 8G

Intro

The GeForce GTX 1080 makes use of a 16 nm design. nVidia has set the core speed at 1607 MHz. The GDDR5X RAM works at a frequency of 1251 MHz on this specific model. It features 2560 SPUs along with 160 TAUs and 64 Rasterization Operator Units.

Compare all that to the Radeon R9 390X 8G, which has a core clock frequency of 1050 MHz and a GDDR5 memory frequency of 1500 MHz. It also makes use of a 512-bit memory bus, and makes use of a 28 nm design. It is comprised of 2816 SPUs, 176 TAUs, and 64 Raster Operation 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

As far as performance goes, the Radeon R9 390X 8G should theoretically be a bit superior to the GeForce GTX 1080 overall. (explain)

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

Texel Rate

The GeForce GTX 1080 should be much (approximately 39%) faster with regards to texture 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 much (about 53%) more effective at AA than the Radeon R9 390X 8G, and will be capable of handling higher resolutions better. (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

Display 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 ×16 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 data (measured in megabytes per second) that can be transported past the external memory interface in one second. It is calculated by multiplying the card's bus width by its memory clock speed. In the case of DDR RAM, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better 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 number of texture map elements (texels) that are processed per second. This is worked out by multiplying the total texture units by the core clock speed of the chip. The better the texel rate, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card could possibly record to its local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. 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 ability to reach the maximum fill rate.

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