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Radeon R5 M255 vs Radeon R9 285

Intro

The Radeon R5 M255 features core clock speeds of 940 MHz on the GPU, and 1000 MHz on the 2048 MB of DDR3 RAM. It features 320 SPUs as well as 20 Texture Address Units and 8 Rasterization Operator Units.

Compare those specifications to the Radeon R9 285, which has a clock frequency of 918 MHz and a GDDR5 memory frequency of 1375 MHz. It also features a 256-bit bus, and uses a 28 nm design. It features 1792 SPUs, 112 Texture Address Units, and 32 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

In theory, the Radeon R9 285 will be 1000% quicker than the Radeon R5 M255 in general, because of its higher data rate. (explain)

Radeon R9 285 176000 MB/sec
Radeon R5 M255 16000 MB/sec
Difference: 160000 (1000%)

Texel Rate

The Radeon R9 285 will be much (more or less 447%) better at AF than the Radeon R5 M255. (explain)

Radeon R9 285 102816 Mtexels/sec
Radeon R5 M255 18800 Mtexels/sec
Difference: 84016 (447%)

Pixel Rate

The Radeon R9 285 is a lot (about 291%) more effective at AA than the Radeon R5 M255, and also capable of handling higher screen resolutions without slowing down too much. (explain)

Radeon R9 285 29376 Mpixels/sec
Radeon R5 M255 7520 Mpixels/sec
Difference: 21856 (291%)

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 R5 M255

Amazon.com

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Radeon R9 285

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 R5 M255 Radeon R9 285
Manufacturer AMD AMD
Year June 2014 September 2014
Code Name Jet Pro Tonga PRO
Memory 2048 MB 2048 MB
Core Speed 940 MHz 918 MHz
Memory Speed 2000 MHz 5500 MHz
Power (Max TDP) (Unknown) watts 190 watts
Bandwidth 16000 MB/sec 176000 MB/sec
Texel Rate 18800 Mtexels/sec 102816 Mtexels/sec
Pixel Rate 7520 Mpixels/sec 29376 Mpixels/sec
Unified Shaders 320 1792
Texture Mapping Units 20 112
Render Output Units 8 32
Bus Type DDR3 GDDR5
Bus Width 64-bit 256-bit
Fab Process 28 nm 28 nm
Transistors (Unknown) million 5000 million
Bus PCIe 3.0 x8 PCIe 3.0 x16
DirectX Version DirectX 11.2 DirectX 12.0
OpenGL Version OpenGL 4.3 OpenGL 4.4

Memory Bandwidth: Bandwidth is the max amount of information (in units of MB per second) that can be moved over the external memory interface within a second. The number is calculated by multiplying the card's interface width by its memory clock speed. If the card has DDR RAM, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the bandwidth is, the faster 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 in one second. This number is calculated by multiplying the total number of 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 per second.

Pixel Rate: Pixel rate is the most pixels the video card 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 core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate is also dependant on many other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.

Display Prices

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Radeon R5 M255

Amazon.com

Check prices at:

Radeon R9 285

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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