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Radeon R9 380 4G vs Radeon R9 M390X

Intro

The Radeon R9 380 4G has core speeds of 970 MHz on the GPU, and 1425 MHz on the 4096 MB of GDDR5 RAM. It features 1792 SPUs along with 112 TAUs and 32 Rasterization Operator Units.

Compare all that to the Radeon R9 M390X, which makes use of a 28 nm design. AMD has set the core speed at 723 MHz. The GDDR5 memory works at a frequency of 1250 MHz on this specific model. It features 2048 SPUs as well as 128 Texture Address Units and 32 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 M390X 125 Watts
Radeon R9 380 4G 190 Watts
Difference: 65 Watts (52%)

Memory Bandwidth

Theoretically speaking, the Radeon R9 380 4G is 14% faster than the Radeon R9 M390X overall, due to its greater bandwidth. (explain)

Radeon R9 380 4G 182400 MB/sec
Radeon R9 M390X 160000 MB/sec
Difference: 22400 (14%)

Texel Rate

The Radeon R9 380 4G will be just a bit (approximately 17%) more effective at anisotropic filtering than the Radeon R9 M390X. (explain)

Radeon R9 380 4G 108640 Mtexels/sec
Radeon R9 M390X 92544 Mtexels/sec
Difference: 16096 (17%)

Pixel Rate

The Radeon R9 380 4G will be quite a bit (approximately 34%) faster with regards to anti-aliasing than the Radeon R9 M390X, and also should be capable of handling higher resolutions better. (explain)

Radeon R9 380 4G 31040 Mpixels/sec
Radeon R9 M390X 23136 Mpixels/sec
Difference: 7904 (34%)

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 380 4G

Amazon.com

Check prices at:

Radeon R9 M390X

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.

Specifications

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Model Radeon R9 380 4G Radeon R9 M390X
Manufacturer AMD AMD
Year June 2015 2015
Code Name Antigua PRO Tonga
Memory 4096 MB 4096 MB
Core Speed 970 MHz 723 MHz
Memory Speed 5700 MHz 5000 MHz
Power (Max TDP) 190 watts 125 watts
Bandwidth 182400 MB/sec 160000 MB/sec
Texel Rate 108640 Mtexels/sec 92544 Mtexels/sec
Pixel Rate 31040 Mpixels/sec 23136 Mpixels/sec
Unified Shaders 1792 2048
Texture Mapping Units 112 128
Render Output Units 32 32
Bus Type GDDR5 GDDR5
Bus Width 256-bit 256-bit
Fab Process 28 nm 28 nm
Transistors 5000 million (Unknown) million
Bus PCIe 3.0 ×16 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 max amount of data (counted in MB per second) that can be transported across the external memory interface in one second. It's calculated by multiplying the card's interface width by its memory speed. In the case of DDR memory, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. 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 amount of texture map elements (texels) that can be applied in one second. This number is worked out by multiplying the total texture units by the core speed of the chip. The better this number, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip can possibly write to its local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the number of Render Output Units 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 fill rate also depends on quite a few other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the max fill rate.

Display Prices

Hide Prices

Radeon R9 380 4G

Amazon.com

Check prices at:

Radeon R9 M390X

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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