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Radeon R5 M255 vs Radeon R9 390 8G

Intro

The Radeon R5 M255 uses a 28 nm design. AMD has set the core speed at 940 MHz. The DDR3 memory runs at a frequency of 1000 MHz on this model. It features 320 SPUs along with 20 TAUs and 8 ROPs.

Compare all that to the Radeon R9 390 8G, which has a clock frequency of 1000 MHz and a GDDR5 memory frequency of 1500 MHz. It also makes use of a 512-bit bus, and uses a 28 nm design. It features 2560 SPUs, 160 TAUs, and 64 Raster Operation Units.

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

The Radeon R9 390 8G should in theory be quite a bit faster than the Radeon R5 M255 overall. (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 quite a bit (more or less 751%) better at AF 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 should be a lot (about 751%) faster with regards to FSAA than the Radeon R5 M255, and also capable of handling higher 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: Bandwidth is the max amount of data (counted in megabytes per second) that can be transported across the external memory interface within a second. It's worked out by multiplying the bus width by its memory clock speed. If it uses DDR RAM, it must be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the bandwidth is, 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 amount of texture map elements (texels) that can be applied per second. This figure is calculated by multiplying the total texture units by the core speed of the chip. The higher the texel rate, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

Pixel Rate: Pixel rate is the most pixels the graphics card could possibly write to the local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate also depends on lots of other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the max 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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