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Nvidia Titan X vs Radeon R9 390 8G


Intro

The Nvidia Titan X features a GPU clock speed of 1417 MHz, and the 12288 MB of GDDR5X RAM is set to run at 1251 MHz through a 384-bit bus. It also features 3584 Stream Processors, 224 Texture Address Units, and 96 Raster Operation Units.

Compare all of that to the Radeon R9 390 8G, which features core clock speeds of 1000 MHz on the GPU, and 1500 MHz on the 8192 MB of GDDR5 memory. It features 2560 SPUs along with 160 Texture Address Units 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 390 8G 275 Watts
Difference: 25 Watts (10%)

Memory Bandwidth

The Nvidia Titan X, in theory, should be much faster than the Radeon R9 390 8G in general. (explain)

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

Texel Rate

The Nvidia Titan X is a lot (about 98%) more effective at texture filtering 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

The Nvidia Titan X should be a lot (about 113%) faster with regards to full screen anti-aliasing than the Radeon R9 390 8G, and also will be able to handle higher screen resolutions better. (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

Nvidia Titan X

Radeon R9 390 8G

Specifications

Display 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 491520 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: Bandwidth is the maximum amount of information (in units of megabytes per second) that can be transported past the external memory interface in a second. It is worked out by multiplying the bus width by its memory speed. In the case of DDR type RAM, it should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are processed in one second. This figure is worked out by multiplying the total texture units by the core clock speed of the chip. The higher the texel rate, the better the graphics card will be at handling 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 the graphics card can possibly record to its local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate also depends on quite a few other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the max fill rate.

Nvidia Titan X

Radeon R9 390 8G

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