Radeon R9 M265X vs Radeon RX 580

Intro

Compare all that to the Radeon RX 580, which has clock speeds of 1257 MHz on the GPU, and 2000 MHz on the 8192 MB of GDDR5 memory. It features 2304 SPUs as well as 144 TAUs and 32 ROPs.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Memory Bandwidth

In theory, the Radeon RX 580 should be 264% faster than the Radeon R9 M265X in general, because of its higher data rate. (explain)

Radeon RX 580		262144 MB/sec
Radeon R9 M265X		72000 MB/sec
	Difference: 190144 (264%)

Texel Rate

The Radeon RX 580 is much (more or less 687%) more effective at anisotropic filtering than the Radeon R9 M265X. (explain)

Radeon RX 580		181008 Mtexels/sec
Radeon R9 M265X		23000 Mtexels/sec
	Difference: 158008 (687%)

Pixel Rate

The Radeon RX 580 should be quite a bit (approximately 337%) more effective at FSAA than the Radeon R9 M265X, and able to handle higher resolutions without losing too much performance. (explain)

Radeon RX 580		40224 Mpixels/sec
Radeon R9 M265X		9200 Mpixels/sec
	Difference: 31024 (337%)

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 (measured in megabytes per second) that can be transported over the external memory interface within a second. The number is worked out by multiplying the bus width by its memory clock speed. If it uses DDR type RAM, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are applied in one second. This number is worked out by multiplying the total number of texture units by the core speed of the chip. The better this number, the better the card will be at 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 can possibly record to the local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of Raster Operations Pipelines by the the core 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 fill rate is also dependant on many other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.