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Radeon R5 M255 vs Radeon R9 390X 8G

Intro

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

Compare all that to the Radeon R9 390X 8G, which makes use of a 28 nm design. AMD has set the core speed at 1050 MHz. The GDDR5 memory runs at a frequency of 1500 MHz on this specific card. It features 2816 SPUs as well as 176 TAUs and 64 Rasterization Operator Units.

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

Theoretically speaking, the Radeon R9 390X 8G is 2300% faster than the Radeon R5 M255 overall, due to its greater bandwidth. (explain)

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

Texel Rate

The Radeon R9 390X 8G is a lot (approximately 883%) faster with regards to texture filtering than the Radeon R5 M255. (explain)

Radeon R9 390X 8G 184800 Mtexels/sec
Radeon R5 M255 18800 Mtexels/sec
Difference: 166000 (883%)

Pixel Rate

If using high levels of AA is important to you, then the Radeon R9 390X 8G is the winner, by far. (explain)

Radeon R9 390X 8G 67200 Mpixels/sec
Radeon R5 M255 7520 Mpixels/sec
Difference: 59680 (794%)

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 390X 8G

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 390X 8G
Manufacturer AMD AMD
Year June 2014 June 2015
Code Name Jet Pro Grenada XT
Memory 2048 MB 8192 MB
Core Speed 940 MHz 1050 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 184800 Mtexels/sec
Pixel Rate 7520 Mpixels/sec 67200 Mpixels/sec
Unified Shaders 320 2816
Texture Mapping Units 20 176
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 largest amount of data (counted in MB per second) that can be moved over the external memory interface in one second. The number is worked out by multiplying the interface width by its memory clock speed. If the card has DDR type RAM, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the card's memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be applied per second. This is worked out by multiplying the total number of texture units by the core speed of the chip. The higher this number, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

Pixel Rate: Pixel rate is the most pixels the video card could possibly write to its local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate is also dependant on lots of other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.

Display Prices

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Radeon R5 M255

Amazon.com

Check prices at:

Radeon R9 390X 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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