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Radeon R9 390 8G vs Radeon R9 M280X

Intro

The Radeon R9 390 8G uses a 28 nm design. AMD has clocked the core speed at 1000 MHz. The GDDR5 RAM runs at a speed of 1500 MHz on this particular model. It features 2560 SPUs along with 160 TAUs and 64 ROPs.

Compare those specs to the Radeon R9 M280X, which makes use of a 28 nm design. AMD has set the core frequency at 900 MHz. The GDDR5 RAM is set to run at a speed of 1375 MHz on this particular card. It features 896 SPUs along with 56 Texture Address Units and 16 Rasterization Operator Units.

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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

In theory, the Radeon R9 390 8G should be 336% quicker than the Radeon R9 M280X in general, because of its greater bandwidth. (explain)

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

Texel Rate

The Radeon R9 390 8G is a lot (about 217%) faster with regards to AF 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 a high resolution is important to you, then the Radeon R9 390 8G is superior to the Radeon R9 M280X, 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 information (counted in megabytes per second) that can be transported past the external memory interface within a second. It is calculated by multiplying the card's interface width by its memory speed. In the case of DDR memory, it should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are processed in one second. This figure is worked out by multiplying the total number of texture units of the card by the core clock speed of the chip. The better this number, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip could possibly write 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 core clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate also depends on lots of other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the max 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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