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Radeon R5 M255 vs Radeon R7 250X

Intro

The Radeon R5 M255 uses a 28 nm design. AMD has clocked the core speed at 940 MHz. The DDR3 RAM runs at a frequency of 1000 MHz on this particular model. It features 320 SPUs as well as 20 Texture Address Units and 8 ROPs.

Compare those specs to the Radeon R7 250X, which comes with GPU clock speed of 1000 MHz, and 1024 MB of GDDR5 RAM set to run at 1125 MHz through a 128-bit bus. It also is made up of 640 SPUs, 40 TAUs, and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

Theoretically speaking, the Radeon R7 250X should perform quite a bit faster than the Radeon R5 M255 overall. (explain)

Radeon R7 250X 72000 MB/sec
Radeon R5 M255 16000 MB/sec
Difference: 56000 (350%)

Texel Rate

The Radeon R7 250X will be much (more or less 113%) more effective at anisotropic filtering than the Radeon R5 M255. (explain)

Radeon R7 250X 40000 Mtexels/sec
Radeon R5 M255 18800 Mtexels/sec
Difference: 21200 (113%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the Radeon R7 250X is a better choice, by far. (explain)

Radeon R7 250X 16000 Mpixels/sec
Radeon R5 M255 7520 Mpixels/sec
Difference: 8480 (113%)

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 R7 250X

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 R5 M255 Radeon R7 250X
Manufacturer AMD AMD
Year June 2014 February 2014
Code Name Jet Pro Cape Verde XT
Memory 2048 MB 1024 MB
Core Speed 940 MHz 1000 MHz
Memory Speed 2000 MHz 4500 MHz
Power (Max TDP) (Unknown) watts 95 watts
Bandwidth 16000 MB/sec 72000 MB/sec
Texel Rate 18800 Mtexels/sec 40000 Mtexels/sec
Pixel Rate 7520 Mpixels/sec 16000 Mpixels/sec
Unified Shaders 320 640
Texture Mapping Units 20 40
Render Output Units 8 16
Bus Type DDR3 GDDR5
Bus Width 64-bit 128-bit
Fab Process 28 nm 28 nm
Transistors (Unknown) million 1500 million
Bus PCIe 3.0 x8 PCIe 3.0 x16
DirectX Version DirectX 11.2 DirectX 11.2
OpenGL Version OpenGL 4.3 OpenGL 4.3

Memory Bandwidth: Memory bandwidth is the maximum amount of information (measured in MB per second) that can be transported across the external memory interface within a second. It's calculated by multiplying the interface width by the speed of its memory. If it uses DDR type RAM, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are processed per second. This figure is calculated by multiplying the total amount of texture units of the card by the core speed of the chip. The higher 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 maximum amount of pixels the graphics card can possibly write to the local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the amount of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate also depends on quite a few other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.

Display Prices

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Radeon R5 M255

Amazon.com

Check prices at:

Radeon R7 250X

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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