Radeon R9 M270X vs Radeon RX 580

Intro

Compare those specs to the Radeon RX 580, which comes with a core clock speed of 1257 MHz and a GDDR5 memory frequency of 2000 MHz. It also uses a 256-bit bus, and uses a 14 nm design. It is made up of 2304 SPUs, 144 Texture Address Units, and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

The Radeon RX 580 should in theory be much faster than the Radeon R9 M270X overall. (explain)

Radeon RX 580		262144 MB/sec
Radeon R9 M270X		72000 MB/sec
	Difference: 190144 (264%)

Texel Rate

The Radeon RX 580 will be much (approximately 524%) more effective at texture filtering than the Radeon R9 M270X. (explain)

Radeon RX 580		181008 Mtexels/sec
Radeon R9 M270X		29000 Mtexels/sec
	Difference: 152008 (524%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the Radeon RX 580 is a better choice, by far. (explain)

Radeon RX 580		40224 Mpixels/sec
Radeon R9 M270X		11600 Mpixels/sec
	Difference: 28624 (247%)

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 max amount of information (counted in MB per second) that can be transported over the external memory interface within a second. It is calculated by multiplying the bus width by the speed of its memory. If it uses DDR memory, it must be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip could possibly write to its local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of Raster Operations Pipelines by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate also depends on many other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.