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Radeon R9 390 8G vs Radeon R9 M280X

Intro

The Radeon R9 390 8G makes use of a 28 nm design. AMD has set the core speed at 1000 MHz. The GDDR5 memory runs at a speed of 1500 MHz on this specific model. It features 2560 SPUs as well as 160 TAUs and 64 ROPs.

Compare all that to the Radeon R9 M280X, which comes with a clock speed of 900 MHz and a GDDR5 memory speed of 1375 MHz. It also uses a 128-bit bus, and uses a 28 nm design. It is made up of 896 SPUs, 56 Texture Address Units, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 M280X 75 Watts
Radeon R9 390 8G 275 Watts
Difference: 200 Watts (267%)

Memory Bandwidth

The Radeon R9 390 8G should in theory perform a lot faster than the Radeon R9 M280X in general. (explain)

Radeon R9 390 8G 384000 MB/sec
Radeon R9 M280X 88000 MB/sec
Difference: 296000 (336%)

Texel Rate

The Radeon R9 390 8G should be quite a bit (more or less 217%) faster with regards to anisotropic filtering than the Radeon R9 M280X. (explain)

Radeon R9 390 8G 160000 Mtexels/sec
Radeon R9 M280X 50400 Mtexels/sec
Difference: 109600 (217%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the Radeon R9 390 8G is a better choice, by far. (explain)

Radeon R9 390 8G 64000 Mpixels/sec
Radeon R9 M280X 14400 Mpixels/sec
Difference: 49600 (344%)

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 390 8G

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 390 8G Radeon R9 M280X
Manufacturer AMD AMD
Year June 2015 Feb 9 2015
Code Name Grenada PRO Saturn XT
Memory 8192 MB 4096 MB
Core Speed 1000 MHz 900 MHz
Memory Speed 6000 MHz 5500 MHz
Power (Max TDP) 275 watts 75 watts
Bandwidth 384000 MB/sec 88000 MB/sec
Texel Rate 160000 Mtexels/sec 50400 Mtexels/sec
Pixel Rate 64000 Mpixels/sec 14400 Mpixels/sec
Unified Shaders 2560 896
Texture Mapping Units 160 56
Render Output Units 64 16
Bus Type GDDR5 GDDR5
Bus Width 512-bit 128-bit
Fab Process 28 nm 28 nm
Transistors 6200 million (Unknown) million
Bus PCIe 3.0 ×16 PCIe 3.0 x16
DirectX Version DirectX 12.0 DirectX 11.2
OpenGL Version OpenGL 4.5 OpenGL 4.3

Memory Bandwidth: Memory bandwidth is the largest amount of data (measured in MB per second) that can be moved across the external memory interface within a second. It is worked out by multiplying the card's interface width by the speed of its memory. In the case of DDR RAM, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the bandwidth is, 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 texture map elements (texels) that can be processed per second. This number is worked out by multiplying the total number of texture units by the core speed of the chip. The higher the texel rate, the better the 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 could possibly record to the local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the amount of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as 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, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.

Display Prices

Hide Prices

Radeon R9 390 8G

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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