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Nvidia Titan X vs Radeon R9 390 8G

Intro

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

Compare all that to the Radeon R9 390 8G, which uses a 28 nm design. AMD has set the core speed at 1000 MHz. The GDDR5 RAM runs at a frequency of 1500 MHz on this model. It features 2560 SPUs as well as 160 TAUs and 64 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

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

Memory Bandwidth

In theory, the Nvidia Titan X should be 2% quicker than the Radeon R9 390 8G in general, due to its higher data rate. (explain)

Nvidia Titan X 393216 MB/sec
Radeon R9 390 8G 384000 MB/sec
Difference: 9216 (2%)

Texel Rate

The Nvidia Titan X should be a lot (approximately 98%) faster with regards to AF than the Radeon R9 390 8G. (explain)

Nvidia Titan X 317408 Mtexels/sec
Radeon R9 390 8G 160000 Mtexels/sec
Difference: 157408 (98%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the Nvidia Titan X is a better choice, by a large margin. (explain)

Nvidia Titan X 136032 Mpixels/sec
Radeon R9 390 8G 64000 Mpixels/sec
Difference: 72032 (113%)

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 390 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 390 8G
Manufacturer nVidia AMD
Year August 2016 June 2015
Code Name GP102-400 Grenada PRO
Memory 12288 MB 8192 MB
Core Speed 1417 MHz 1000 MHz
Memory Speed 10008 MHz 6000 MHz
Power (Max TDP) 250 watts 275 watts
Bandwidth 393216 MB/sec 384000 MB/sec
Texel Rate 317408 Mtexels/sec 160000 Mtexels/sec
Pixel Rate 136032 Mpixels/sec 64000 Mpixels/sec
Unified Shaders 3584 2560
Texture Mapping Units 224 160
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: Memory bandwidth is the largest amount of information (counted in megabytes per second) that can be transferred over the external memory interface in a second. It is calculated by multiplying the bus width by the speed of its memory. If the card has DDR RAM, 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 higher screen resolutions.

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

Pixel Rate: Pixel rate is the most pixels that the graphics card could possibly write to its local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the number of ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate also depends on quite a few other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.

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