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Radeon R9 280 vs Radeon R9 M385X

Intro

The Radeon R9 280 comes with core clock speeds of 933 MHz on the GPU, and 1250 MHz on the 3072 MB of GDDR5 memory. It features 1792 SPUs as well as 112 Texture Address Units and 32 Rasterization Operator Units.

Compare that to the Radeon R9 M385X, which comes with core clock speeds of 1100 MHz on the GPU, and 1500 MHz on the 4096 MB of GDDR5 memory. It features 896 SPUs along with 56 TAUs and 16 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

In theory, the Radeon R9 280 should perform much faster than the Radeon R9 M385X overall. (explain)

Radeon R9 280 240000 MB/sec
Radeon R9 M385X 96000 MB/sec
Difference: 144000 (150%)

Texel Rate

The Radeon R9 280 should be a lot (approximately 70%) faster with regards to texture filtering than the Radeon R9 M385X. (explain)

Radeon R9 280 104496 Mtexels/sec
Radeon R9 M385X 61600 Mtexels/sec
Difference: 42896 (70%)

Pixel Rate

The Radeon R9 280 is quite a bit (approximately 70%) better at full screen anti-aliasing than the Radeon R9 M385X, and capable of handling higher screen resolutions better. (explain)

Radeon R9 280 29856 Mpixels/sec
Radeon R9 M385X 17600 Mpixels/sec
Difference: 12256 (70%)

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 280

Amazon.com

Check prices at:

Radeon R9 M385X

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 280 Radeon R9 M385X
Manufacturer AMD AMD
Year March 2014 2015
Code Name Tahiti Pro Bonaire
Memory 3072 MB 4096 MB
Core Speed 933 MHz 1100 MHz
Memory Speed 5000 MHz 6000 MHz
Power (Max TDP) 250 watts (Unknown) watts
Bandwidth 240000 MB/sec 96000 MB/sec
Texel Rate 104496 Mtexels/sec 61600 Mtexels/sec
Pixel Rate 29856 Mpixels/sec 17600 Mpixels/sec
Unified Shaders 1792 896
Texture Mapping Units 112 56
Render Output Units 32 16
Bus Type GDDR5 GDDR5
Bus Width 384-bit 128-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: Bandwidth is the largest amount of data (in units of MB per second) that can be transferred across the external memory interface in one second. The number is worked out by multiplying the card's bus width by its memory speed. If the card has DDR RAM, it must be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the card's 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 texture map elements (texels) that can be processed per second. This figure is worked out by multiplying the total amount of texture units by the core speed of the chip. The better this number, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip can possibly record to its local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of Render Output Units 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 output rate also depends on lots of other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the max fill rate.

Display Prices

Hide Prices

Radeon R9 280

Amazon.com

Check prices at:

Radeon R9 M385X

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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