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Radeon R7 250X vs Radeon RX 580

Intro

The Radeon R7 250X uses a 28 nm design. AMD has set the core frequency at 1000 MHz. The GDDR5 RAM is set to run at a speed of 1125 MHz on this specific model. It features 640 SPUs as well as 40 Texture Address Units and 16 ROPs.

Compare all of that to the Radeon RX 580, which comes with GPU core speed of 1257 MHz, and 8192 MB of GDDR5 RAM set to run at 2000 MHz through a 256-bit bus. It also is made up of 2304 Stream Processors, 144 Texture Address Units, and 32 Raster Operation Units.

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Benchmarks

These are real-world performance benchmarks that were submitted by Hardware Compare users. The scores seen here are the average of all benchmarks submitted for each respective test and hardware.

3DMark Fire Strike Graphics Score

Radeon RX 580		13630 points
Radeon R7 250X		2860 points
	Difference: 10770 (377%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

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

Memory Bandwidth

Performance-wise, the Radeon RX 580 should theoretically be a lot better than the Radeon R7 250X in general. (explain)

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

Texel Rate

The Radeon RX 580 will be much (approximately 353%) better at texture filtering than the Radeon R7 250X. (explain)

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

Pixel Rate

If running with lots of anti-aliasing is important to you, then the Radeon RX 580 is the winner, by far. (explain)

Radeon RX 580		40224 Mpixels/sec
Radeon R7 250X		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

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Radeon R7 250X

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Radeon RX 580

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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 R7 250X	Radeon RX 580
Manufacturer	AMD	AMD
Year	February 2014	April 2017
Code Name	Cape Verde XT	Polaris 20
Memory	1024 MB	8192 MB
Core Speed	1000 MHz	1257 MHz
Memory Speed	4500 MHz	8000 MHz
Power (Max TDP)	95 watts	185 watts
Bandwidth	72000 MB/sec	262144 MB/sec
Texel Rate	40000 Mtexels/sec	181008 Mtexels/sec
Pixel Rate	16000 Mpixels/sec	40224 Mpixels/sec
Unified Shaders	640	2304
Texture Mapping Units	40	144
Render Output Units	16	32
Bus Type	GDDR5	GDDR5
Bus Width	128-bit	256-bit
Fab Process	28 nm	14 nm
Transistors	1500 million	5700 million
Bus	PCIe 3.0 x16	PCIe 3.0 x16
DirectX Version	DirectX 11.2	DirectX 12.0
OpenGL Version	OpenGL 4.3	OpenGL 4.5

Memory Bandwidth: Memory bandwidth is the max amount of information (in units of MB per second) that can be transferred past the external memory interface in a second. It is worked out by multiplying the bus width by the speed of its memory. In the case of DDR type memory, the result should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card can possibly record to the local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the amount of Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate is also dependant on quite a few other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the max fill rate.

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