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Radeon R5 M255 vs Radeon R9 M290X

Intro

The Radeon R5 M255 features a clock speed of 940 MHz and a DDR3 memory speed of 1000 MHz. It also uses a 64-bit memory bus, and makes use of a 28 nm design. It features 320 SPUs, 20 Texture Address Units, and 8 Raster Operation Units.

Compare those specs to the Radeon R9 M290X, which has a core clock frequency of 850 MHz and a GDDR5 memory frequency of 1200 MHz. It also features a 256-bit bus, and makes use of a 28 nm design. It is made up of 1280 SPUs, 80 Texture Address Units, and 32 ROPs.

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

As far as performance goes, the Radeon R9 M290X should in theory be much superior to the Radeon R5 M255 overall. (explain)

Radeon R9 M290X 153600 MB/sec
Radeon R5 M255 16000 MB/sec
Difference: 137600 (860%)

Texel Rate

The Radeon R9 M290X is quite a bit (approximately 262%) faster with regards to texture filtering than the Radeon R5 M255. (explain)

Radeon R9 M290X 68000 Mtexels/sec
Radeon R5 M255 18800 Mtexels/sec
Difference: 49200 (262%)

Pixel Rate

The Radeon R9 M290X is a lot (more or less 262%) better at FSAA than the Radeon R5 M255, and able to handle higher screen resolutions without losing too much performance. (explain)

Radeon R9 M290X 27200 Mpixels/sec
Radeon R5 M255 7520 Mpixels/sec
Difference: 19680 (262%)

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 M290X

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 R9 M290X
Manufacturer AMD AMD
Year June 2014 May 1 2014
Code Name Jet Pro Neptune XT
Memory 2048 MB 4096 MB
Core Speed 940 MHz 850 MHz
Memory Speed 2000 MHz 4800 MHz
Power (Max TDP) (Unknown) watts 100 watts
Bandwidth 16000 MB/sec 153600 MB/sec
Texel Rate 18800 Mtexels/sec 68000 Mtexels/sec
Pixel Rate 7520 Mpixels/sec 27200 Mpixels/sec
Unified Shaders 320 1280
Texture Mapping Units 20 80
Render Output Units 8 32
Bus Type DDR3 GDDR5
Bus Width 64-bit 256-bit
Fab Process 28 nm 28 nm
Transistors (Unknown) million (Unknown) 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 max amount of data (in units of MB per second) that can be transported past the external memory interface in one second. It is calculated by multiplying the card's bus width by its memory speed. If it uses DDR memory, it must be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the 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 number of texture map elements (texels) that can be applied 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 higher this number, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

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

Display Prices

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Radeon R5 M255

Amazon.com

Check prices at:

Radeon R9 M290X

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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