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Radeon R9 M280X vs Radeon R9 M395X

Intro

The Radeon R9 M280X makes use of a 28 nm design. AMD has clocked the core speed at 900 MHz. The GDDR5 RAM runs at a frequency of 1375 MHz on this card. It features 896 SPUs as well as 56 TAUs and 16 Rasterization Operator Units.

Compare that to the Radeon R9 M395X, which has a clock speed of 723 MHz and a GDDR5 memory speed of 1250 MHz. It also features a 256-bit memory bus, and makes use of a 28 nm design. It is made up of 2048 SPUs, 128 Texture Address Units, and 32 Raster Operation Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 M280X 75 Watts
Radeon R9 M395X 125 Watts
Difference: 50 Watts (67%)

Memory Bandwidth

Theoretically speaking, the Radeon R9 M395X is 82% quicker than the Radeon R9 M280X in general, due to its greater data rate. (explain)

Radeon R9 M395X 160000 MB/sec
Radeon R9 M280X 88000 MB/sec
Difference: 72000 (82%)

Texel Rate

The Radeon R9 M395X is quite a bit (more or less 84%) better at AF than the Radeon R9 M280X. (explain)

Radeon R9 M395X 92544 Mtexels/sec
Radeon R9 M280X 50400 Mtexels/sec
Difference: 42144 (84%)

Pixel Rate

If running with a high screen resolution is important to you, then the Radeon R9 M395X is superior to the Radeon R9 M280X, and very much so. (explain)

Radeon R9 M395X 23136 Mpixels/sec
Radeon R9 M280X 14400 Mpixels/sec
Difference: 8736 (61%)

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 M280X

Amazon.com

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Radeon R9 M395X

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 M280X Radeon R9 M395X
Manufacturer AMD AMD
Year Feb 9 2015 2015
Code Name Saturn XT Tonga
Memory 4096 MB 4096 MB
Core Speed 900 MHz 723 MHz
Memory Speed 5500 MHz 5000 MHz
Power (Max TDP) 75 watts 125 watts
Bandwidth 88000 MB/sec 160000 MB/sec
Texel Rate 50400 Mtexels/sec 92544 Mtexels/sec
Pixel Rate 14400 Mpixels/sec 23136 Mpixels/sec
Unified Shaders 896 2048
Texture Mapping Units 56 128
Render Output Units 16 32
Bus Type GDDR5 GDDR5
Bus Width 128-bit 256-bit
Fab Process 28 nm 28 nm
Transistors (Unknown) 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: Bandwidth is the maximum amount of data (counted in megabytes per second) that can be moved past the external memory interface within a second. It is worked out by multiplying the card's interface width by its memory clock speed. If it uses DDR memory, it must be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be processed in one second. This number 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 applied in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card can possibly record to the local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the amount of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate is also dependant on quite a few other factors, most notably 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 M280X

Amazon.com

Check prices at:

Radeon R9 M395X

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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