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Radeon R5 M255 vs Radeon R9 390 8G

Intro

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

Compare all of that to the Radeon R9 390 8G, which has GPU clock speed of 1000 MHz, and 8192 MB of GDDR5 memory running at 1500 MHz through a 512-bit bus. It also is made up of 2560 Stream Processors, 160 Texture Address Units, and 64 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

The Radeon R9 390 8G should theoretically be a lot faster than the Radeon R5 M255 in general. (explain)

Radeon R9 390 8G 384000 MB/sec
Radeon R5 M255 16000 MB/sec
Difference: 368000 (2300%)

Texel Rate

The Radeon R9 390 8G will be much (approximately 751%) faster with regards to texture filtering than the Radeon R5 M255. (explain)

Radeon R9 390 8G 160000 Mtexels/sec
Radeon R5 M255 18800 Mtexels/sec
Difference: 141200 (751%)

Pixel Rate

The Radeon R9 390 8G is quite a bit (more or less 751%) more effective at full screen anti-aliasing than the Radeon R5 M255, and also capable of handling higher screen resolutions while still performing well. (explain)

Radeon R9 390 8G 64000 Mpixels/sec
Radeon R5 M255 7520 Mpixels/sec
Difference: 56480 (751%)

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

Check prices at:

Radeon R9 390 8G

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 390 8G
Manufacturer AMD AMD
Year June 2014 June 2015
Code Name Jet Pro Grenada PRO
Memory 2048 MB 8192 MB
Core Speed 940 MHz 1000 MHz
Memory Speed 2000 MHz 6000 MHz
Power (Max TDP) (Unknown) watts 275 watts
Bandwidth 16000 MB/sec 384000 MB/sec
Texel Rate 18800 Mtexels/sec 160000 Mtexels/sec
Pixel Rate 7520 Mpixels/sec 64000 Mpixels/sec
Unified Shaders 320 2560
Texture Mapping Units 20 160
Render Output Units 8 64
Bus Type DDR3 GDDR5
Bus Width 64-bit 512-bit
Fab Process 28 nm 28 nm
Transistors (Unknown) million 6200 million
Bus PCIe 3.0 x8 PCIe 3.0 ×16
DirectX Version DirectX 11.2 DirectX 12.0
OpenGL Version OpenGL 4.3 OpenGL 4.5

Memory Bandwidth: Memory bandwidth is the max amount of data (measured in megabytes per second) that can be transferred across the external memory interface within a second. It's calculated by multiplying the card's bus width by its memory speed. If it uses DDR memory, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the bandwidth is, 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 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 speed of the chip. The better the texel rate, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the most pixels the video card can possibly record to its local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the amount of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate also depends on quite a few other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.

Display Prices

Hide Prices

Radeon R5 M255

Amazon.com

Check prices at:

Radeon R9 390 8G

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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