Radeon R5 M255 vs Radeon R9 M390X

Intro

Compare those specifications to the Radeon R9 M390X, which has GPU clock speed of 723 MHz, and 4096 MB of GDDR5 RAM set to run at 1250 MHz through a 256-bit bus. It also is made up of 2048 Stream Processors, 128 TAUs, and 32 ROPs.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Memory Bandwidth

Theoretically speaking, the Radeon R9 M390X should be 900% faster than the Radeon R5 M255 in general, because of its higher bandwidth. (explain)

Radeon R9 M390X		160000 MB/sec
Radeon R5 M255		16000 MB/sec
	Difference: 144000 (900%)

Texel Rate

The Radeon R9 M390X will be a lot (more or less 392%) faster with regards to anisotropic filtering than the Radeon R5 M255. (explain)

Radeon R9 M390X		92544 Mtexels/sec
Radeon R5 M255		18800 Mtexels/sec
	Difference: 73744 (392%)

Pixel Rate

If running with high levels of AA is important to you, then the Radeon R9 M390X is a better choice, by far. (explain)

Radeon R9 M390X		23136 Mpixels/sec
Radeon R5 M255		7520 Mpixels/sec
	Difference: 15616 (208%)

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

Specifications

Memory Bandwidth: Bandwidth is the maximum amount of information (measured in megabytes per second) that can be transferred across the external memory interface within a second. The number is worked out by multiplying the interface width by its memory clock speed. In the case of DDR memory, it must be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the bandwidth is, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are applied in one second. This is worked out 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 graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in one second.

Pixel Rate: Pixel rate is the most pixels the video card can possibly write to the local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the number of Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate also depends on quite a few other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.