Radeon R7 250X 2GB vs Radeon RX 470 4GB

Intro

Compare those specs to the Radeon RX 470 4GB, which comes with a GPU core clock speed of 926 MHz, and 4096 MB of GDDR5 RAM running at 1650 MHz through a 256-bit bus. It also is made up of 2048 Stream Processors, 128 Texture Address Units, and 32 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R7 250X 2GB		95 Watts
Radeon RX 470 4GB		120 Watts
	Difference: 25 Watts (26%)

Memory Bandwidth

As far as performance goes, the Radeon RX 470 4GB should in theory be quite a bit superior to the Radeon R7 250X 2GB overall. (explain)

Radeon RX 470 4GB		211200 MB/sec
Radeon R7 250X 2GB		72000 MB/sec
	Difference: 139200 (193%)

Texel Rate

The Radeon RX 470 4GB should be much (approximately 196%) more effective at anisotropic filtering than the Radeon R7 250X 2GB. (explain)

Radeon RX 470 4GB		118528 Mtexels/sec
Radeon R7 250X 2GB		40000 Mtexels/sec
	Difference: 78528 (196%)

Pixel Rate

The Radeon RX 470 4GB should be quite a bit (about 85%) more effective at FSAA than the Radeon R7 250X 2GB, and will be capable of handling higher screen resolutions more effectively. (explain)

Radeon RX 470 4GB		29632 Mpixels/sec
Radeon R7 250X 2GB		16000 Mpixels/sec
	Difference: 13632 (85%)

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 data (in units of megabytes per second) that can be transported over the external memory interface in a second. The number is worked out by multiplying the bus width by its memory speed. If the card has DDR type memory, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the card's 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 amount of texture map elements (texels) that can be applied per second. This number is worked out by multiplying the total number of 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 most pixels that the graphics chip could possibly write to the local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate is also dependant on quite a few other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.