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Radeon R9 285 vs Radeon R9 M280X

Intro

The Radeon R9 285 has a core clock speed of 918 MHz and a GDDR5 memory frequency of 1375 MHz. It also uses a 256-bit bus, and uses a 28 nm design. It is made up of 1792 SPUs, 112 TAUs, and 32 ROPs.

Compare those specifications to the Radeon R9 M280X, which comes with clock speeds of 900 MHz on the GPU, and 1375 MHz on the 4096 MB of GDDR5 RAM. 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 285 190 Watts
Difference: 115 Watts (153%)

Memory Bandwidth

Theoretically, the Radeon R9 285 should perform quite a bit faster than the Radeon R9 M280X in general. (explain)

Radeon R9 285 176000 MB/sec
Radeon R9 M280X 88000 MB/sec
Difference: 88000 (100%)

Texel Rate

The Radeon R9 285 will be a lot (more or less 104%) better at AF than the Radeon R9 M280X. (explain)

Radeon R9 285 102816 Mtexels/sec
Radeon R9 M280X 50400 Mtexels/sec
Difference: 52416 (104%)

Pixel Rate

The Radeon R9 285 will be much (about 104%) more effective at anti-aliasing than the Radeon R9 M280X, and also able to handle higher screen resolutions better. (explain)

Radeon R9 285 29376 Mpixels/sec
Radeon R9 M280X 14400 Mpixels/sec
Difference: 14976 (104%)

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 285

Amazon.com

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Radeon R9 M280X

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 285 Radeon R9 M280X
Manufacturer AMD AMD
Year September 2014 Feb 9 2015
Code Name Tonga PRO Saturn XT
Memory 2048 MB 4096 MB
Core Speed 918 MHz 900 MHz
Memory Speed 5500 MHz 5500 MHz
Power (Max TDP) 190 watts 75 watts
Bandwidth 176000 MB/sec 88000 MB/sec
Texel Rate 102816 Mtexels/sec 50400 Mtexels/sec
Pixel Rate 29376 Mpixels/sec 14400 Mpixels/sec
Unified Shaders 1792 896
Texture Mapping Units 112 56
Render Output Units 32 16
Bus Type GDDR5 GDDR5
Bus Width 256-bit 128-bit
Fab Process 28 nm 28 nm
Transistors 5000 million (Unknown) million
Bus PCIe 3.0 x16 PCIe 3.0 x16
DirectX Version DirectX 12.0 DirectX 11.2
OpenGL Version OpenGL 4.4 OpenGL 4.3

Memory Bandwidth: Bandwidth is the max amount of data (measured in MB per second) that can be transported across the external memory interface within a second. It's calculated by multiplying the card's interface width by the speed of its memory. If the card has DDR memory, the result should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better 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 amount of texture map elements (texels) that are processed per second. This figure is worked out by multiplying the total texture units by the core speed of the chip. The better this number, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

Pixel Rate: Pixel rate is the maximum number of pixels the video card can possibly record to its local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate is also dependant on quite a few other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the max fill rate.

Display Prices

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Radeon R9 285

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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