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Radeon R9 280X vs Radeon R9 M390X

Intro

The Radeon R9 280X features a GPU clock speed of 850 MHz, and the 3072 MB of GDDR5 memory runs at 1500 MHz through a 384-bit bus. It also is made up of 2048 SPUs, 128 TAUs, and 32 ROPs.

Compare all that to the Radeon R9 M390X, which uses a 28 nm design. AMD has set the core speed at 723 MHz. The GDDR5 memory is set to run at a speed of 1250 MHz on this particular card. It features 2048 SPUs along with 128 TAUs and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 M390X 125 Watts
Radeon R9 280X 250 Watts
Difference: 125 Watts (100%)

Memory Bandwidth

The Radeon R9 280X should in theory be quite a bit faster than the Radeon R9 M390X overall. (explain)

Radeon R9 280X 288000 MB/sec
Radeon R9 M390X 160000 MB/sec
Difference: 128000 (80%)

Texel Rate

The Radeon R9 280X should be a little bit (about 18%) better at anisotropic filtering than the Radeon R9 M390X. (explain)

Radeon R9 280X 108800 Mtexels/sec
Radeon R9 M390X 92544 Mtexels/sec
Difference: 16256 (18%)

Pixel Rate

The Radeon R9 280X should be a little bit (approximately 18%) faster with regards to FSAA than the Radeon R9 M390X, and able to handle higher screen resolutions better. (explain)

Radeon R9 280X 27200 Mpixels/sec
Radeon R9 M390X 23136 Mpixels/sec
Difference: 4064 (18%)

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 280X

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 280X Radeon R9 M390X
Manufacturer AMD AMD
Year October 2013 2015
Code Name Tahiti XTL Tonga
Memory 3072 MB 4096 MB
Core Speed 850 MHz 723 MHz
Memory Speed 6000 MHz 5000 MHz
Power (Max TDP) 250 watts 125 watts
Bandwidth 288000 MB/sec 160000 MB/sec
Texel Rate 108800 Mtexels/sec 92544 Mtexels/sec
Pixel Rate 27200 Mpixels/sec 23136 Mpixels/sec
Unified Shaders 2048 2048
Texture Mapping Units 128 128
Render Output Units 32 32
Bus Type GDDR5 GDDR5
Bus Width 384-bit 256-bit
Fab Process 28 nm 28 nm
Transistors 4313 million (Unknown) million
Bus PCIe 3.0 x16 PCIe 3.0 x16
DirectX Version DirectX 11.2 DirectX 12
OpenGL Version OpenGL 4.3 OpenGL 4.3

Memory Bandwidth: Memory bandwidth is the max amount of information (in units of MB per second) that can be transported across the external memory interface in a second. It is calculated by multiplying the card's bus width by the speed of its memory. In the case of DDR type memory, it must 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 anti-aliasing, HDR and higher screen resolutions.

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

Display Prices

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Radeon R9 280X

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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