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Nvidia Titan X vs Radeon R9 390X 8G

Intro

The Nvidia Titan X has a clock frequency of 1417 MHz and a GDDR5X memory frequency of 1251 MHz. It also uses a 384-bit memory bus, and uses a 16 nm design. It features 3584 SPUs, 224 Texture Address Units, and 96 ROPs.

Compare those specifications to the Radeon R9 390X 8G, which comes with a core clock speed of 1050 MHz and a GDDR5 memory frequency of 1500 MHz. It also makes use of a 512-bit bus, and uses a 28 nm design. It is comprised of 2816 SPUs, 176 TAUs, and 64 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Nvidia Titan X 250 Watts
Radeon R9 390X 8G 275 Watts
Difference: 25 Watts (10%)

Memory Bandwidth

Theoretically speaking, the Nvidia Titan X is 28% faster than the Radeon R9 390X 8G overall, because of its greater bandwidth. (explain)

Nvidia Titan X 491520 MB/sec
Radeon R9 390X 8G 384000 MB/sec
Difference: 107520 (28%)

Texel Rate

The Nvidia Titan X is quite a bit (more or less 72%) more effective at AF than the Radeon R9 390X 8G. (explain)

Nvidia Titan X 317408 Mtexels/sec
Radeon R9 390X 8G 184800 Mtexels/sec
Difference: 132608 (72%)

Pixel Rate

The Nvidia Titan X should be a lot (more or less 102%) faster with regards to anti-aliasing than the Radeon R9 390X 8G, and will be capable of handling higher resolutions without losing too much performance. (explain)

Nvidia Titan X 136032 Mpixels/sec
Radeon R9 390X 8G 67200 Mpixels/sec
Difference: 68832 (102%)

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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Nvidia Titan X

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 Nvidia Titan X Radeon R9 390X 8G
Manufacturer nVidia AMD
Year August 2016 June 2015
Code Name GP102-400 Grenada XT
Memory 12288 MB 8192 MB
Core Speed 1417 MHz 1050 MHz
Memory Speed 10008 MHz 6000 MHz
Power (Max TDP) 250 watts 275 watts
Bandwidth 491520 MB/sec 384000 MB/sec
Texel Rate 317408 Mtexels/sec 184800 Mtexels/sec
Pixel Rate 136032 Mpixels/sec 67200 Mpixels/sec
Unified Shaders 3584 2816
Texture Mapping Units 224 176
Render Output Units 96 64
Bus Type GDDR5X GDDR5
Bus Width 384-bit 512-bit
Fab Process 16 nm 28 nm
Transistors 12000 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 maximum amount of data (counted in MB per second) that can be transported over the external memory interface within a second. It is calculated by multiplying the card's interface width by its memory speed. In the case of DDR type memory, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the memory bandwidth, 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 in one second. This figure is calculated by multiplying the total amount of texture units of the card by the core 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 applied in a second.

Pixel Rate: Pixel rate is the maximum number of pixels the video card could possibly write to the local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the number of Render Output Units 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 output rate also depends on quite a few other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.

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