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Radeon R9 380X vs Radeon R9 M280X

Intro

The Radeon R9 380X has a clock frequency of 970 MHz and a GDDR5 memory speed of 1425 MHz. It also uses a 256-bit bus, and uses a 28 nm design. It features 2048 SPUs, 128 TAUs, and 32 ROPs.

Compare those specs to the Radeon R9 M280X, which has GPU clock speed of 900 MHz, and 4096 MB of GDDR5 memory set to run at 1375 MHz through a 128-bit bus. It also is made up of 896 Stream Processors, 56 TAUs, and 16 Raster Operation Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 M280X 75 Watts
Radeon R9 380X 190 Watts
Difference: 115 Watts (153%)

Memory Bandwidth

Theoretically, the Radeon R9 380X should be much faster than the Radeon R9 M280X in general. (explain)

Radeon R9 380X 182400 MB/sec
Radeon R9 M280X 88000 MB/sec
Difference: 94400 (107%)

Texel Rate

The Radeon R9 380X is much (more or less 146%) faster with regards to texture filtering than the Radeon R9 M280X. (explain)

Radeon R9 380X 124160 Mtexels/sec
Radeon R9 M280X 50400 Mtexels/sec
Difference: 73760 (146%)

Pixel Rate

The Radeon R9 380X is a lot (more or less 116%) faster with regards to AA than the Radeon R9 M280X, and also able to handle higher screen resolutions without losing too much performance. (explain)

Radeon R9 380X 31040 Mpixels/sec
Radeon R9 M280X 14400 Mpixels/sec
Difference: 16640 (116%)

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

Check prices at:

Radeon R9 M280X

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 380X Radeon R9 M280X
Manufacturer AMD AMD
Year November 2015 Feb 9 2015
Code Name Tonga XT Saturn XT
Memory 4096 MB 4096 MB
Core Speed 970 MHz 900 MHz
Memory Speed 5700 MHz 5500 MHz
Power (Max TDP) 190 watts 75 watts
Bandwidth 182400 MB/sec 88000 MB/sec
Texel Rate 124160 Mtexels/sec 50400 Mtexels/sec
Pixel Rate 31040 Mpixels/sec 14400 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 11.2
OpenGL Version OpenGL 4.5 OpenGL 4.3

Memory Bandwidth: Bandwidth is the max amount of information (in units of megabytes per second) that can be moved over the external memory interface in one second. The number is calculated by multiplying the bus width by the speed of its memory. In the case of DDR type memory, it should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the memory bandwidth, the better 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 applied per second. This is worked out by multiplying the total amount of texture units of the card by the core clock speed of the chip. The higher this number, the better the card will be at handling 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 record to its local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate is also dependant on lots of other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.

Display Prices

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Radeon R9 380X

Amazon.com

Check prices at:

Radeon R9 M280X

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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