Radeon R7 250X 2GB vs Radeon RX 580

Intro

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

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R7 250X 2GB		95 Watts
Radeon RX 580		185 Watts
	Difference: 90 Watts (95%)

Memory Bandwidth

In theory, the Radeon RX 580 should be 264% quicker than the Radeon R7 250X 2GB overall, because of its higher data rate. (explain)

Radeon RX 580		262144 MB/sec
Radeon R7 250X 2GB		72000 MB/sec
	Difference: 190144 (264%)

Texel Rate

The Radeon RX 580 is quite a bit (about 353%) more effective at texture filtering than the Radeon R7 250X 2GB. (explain)

Radeon RX 580		181008 Mtexels/sec
Radeon R7 250X 2GB		40000 Mtexels/sec
	Difference: 141008 (353%)

Pixel Rate

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

Radeon RX 580		40224 Mpixels/sec
Radeon R7 250X 2GB		16000 Mpixels/sec
	Difference: 24224 (151%)

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 largest amount of information (counted in MB per second) that can be transferred past the external memory interface in a second. The number is worked out by multiplying the interface width by its memory clock speed. In the case of DDR type memory, the result should 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, HDR and high resolutions.

Texel Rate: Texel rate is the maximum 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 the texel rate, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip can possibly write to its local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate is also dependant on many other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.