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Radeon R9 380 4G vs Radeon R9 M390X

Intro

The Radeon R9 380 4G uses a 28 nm design. AMD has clocked the core frequency at 970 MHz. The GDDR5 RAM runs at a frequency of 1425 MHz on this card. It features 1792 SPUs along with 112 TAUs and 32 ROPs.

Compare that to the Radeon R9 M390X, which has GPU clock speed of 723 MHz, and 4096 MB of GDDR5 RAM set to run at 1250 MHz through a 256-bit bus. It also features 2048 Stream Processors, 128 Texture Address Units, and 32 Raster Operation Units.

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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 will be 14% quicker than the Radeon R9 M390X overall, because of its higher data rate. (explain)

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

Texel Rate

The Radeon R9 380 4G is a small bit (approximately 17%) better 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 is quite a bit (about 34%) more effective at full screen 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

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Radeon R9 M390X

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 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 maximum amount of information (measured in megabytes per second) that can be transferred over the external memory interface in one second. It's worked out by multiplying the interface width by its memory clock speed. If the card has DDR memory, it should be multiplied by 2 again. If 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 amount of texture map elements (texels) that are processed per second. This figure is worked out by multiplying the total texture units by the core speed of the chip. The better the texel rate, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in a second.

Pixel Rate: Pixel rate is the most pixels the video card can possibly record to its local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of Raster Operations Pipelines by the clock speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate is also dependant on lots of other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.

Display Prices

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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.

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