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Radeon R9 380X vs Radeon R9 M385X

Intro

The Radeon R9 380X uses a 28 nm design. AMD has set the core speed at 970 MHz. The GDDR5 RAM runs at a speed of 1425 MHz on this specific card. It features 2048 SPUs as well as 128 Texture Address Units and 32 Rasterization Operator Units.

Compare those specs to the Radeon R9 M385X, which comes with core clock speeds of 1100 MHz on the GPU, and 1500 MHz on the 4096 MB of GDDR5 memory. It features 896 SPUs as well as 56 TAUs and 16 Rasterization Operator Units.

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

As far as performance goes, the Radeon R9 380X should theoretically be a lot better than the Radeon R9 M385X overall. (explain)

Radeon R9 380X 182400 MB/sec
Radeon R9 M385X 96000 MB/sec
Difference: 86400 (90%)

Texel Rate

The Radeon R9 380X will be quite a bit (more or less 102%) better at texture filtering than the Radeon R9 M385X. (explain)

Radeon R9 380X 124160 Mtexels/sec
Radeon R9 M385X 61600 Mtexels/sec
Difference: 62560 (102%)

Pixel Rate

If running with a high screen resolution is important to you, then the Radeon R9 380X is the winner, by a large margin. (explain)

Radeon R9 380X 31040 Mpixels/sec
Radeon R9 M385X 17600 Mpixels/sec
Difference: 13440 (76%)

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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Radeon R9 380X

Amazon.com

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Radeon R9 M385X

Amazon.com

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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 Radeon R9 380X Radeon R9 M385X
Manufacturer AMD AMD
Year November 2015 2015
Code Name Tonga XT Bonaire
Memory 4096 MB 4096 MB
Core Speed 970 MHz 1100 MHz
Memory Speed 5700 MHz 6000 MHz
Power (Max TDP) 190 watts (Unknown) watts
Bandwidth 182400 MB/sec 96000 MB/sec
Texel Rate 124160 Mtexels/sec 61600 Mtexels/sec
Pixel Rate 31040 Mpixels/sec 17600 Mpixels/sec
Unified Shaders 2048 896
Texture Mapping Units 128 56
Render Output Units 32 16
Bus Type GDDR5 GDDR5
Bus Width 256-bit 128-bit
Fab Process 28 nm 28 nm
Transistors 5000 million (Unknown) million
Bus PCIe 3.0 x16 PCIe 3.0 x16
DirectX Version DirectX 12.0 DirectX 12
OpenGL Version OpenGL 4.5 OpenGL 4.3

Memory Bandwidth: Memory bandwidth is the maximum amount of information (counted in megabytes per second) that can be transported past the external memory interface within a second. It is calculated by multiplying the interface width by its memory clock speed. If it uses DDR memory, it must be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the faster the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be applied per second. This figure is worked out by multiplying the total number of texture units of the card 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 processed in one second.

Pixel Rate: Pixel rate is the maximum number of pixels the video card could possibly record to its local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of ROPs 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 output rate is also dependant on many other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the max fill rate.

Display Prices

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Radeon R9 380X

Amazon.com

Check prices at:

Radeon R9 M385X

Amazon.com

Check prices at:

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.

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