Radeon R7 250X 2GB vs Radeon R9 M390X

Intro

Compare that to the Radeon R9 M390X, which features a core clock speed of 723 MHz and a GDDR5 memory frequency of 1250 MHz. It also features a 256-bit memory bus, and uses a 28 nm design. It is made up of 2048 SPUs, 128 Texture Address Units, and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R7 250X 2GB		95 Watts
Radeon R9 M390X		125 Watts
	Difference: 30 Watts (32%)

Memory Bandwidth

Theoretically, the Radeon R9 M390X should perform quite a bit faster than the Radeon R7 250X 2GB in general. (explain)

Radeon R9 M390X		160000 MB/sec
Radeon R7 250X 2GB		72000 MB/sec
	Difference: 88000 (122%)

Texel Rate

The Radeon R9 M390X should be a lot (about 131%) more effective at anisotropic filtering than the Radeon R7 250X 2GB. (explain)

Radeon R9 M390X		92544 Mtexels/sec
Radeon R7 250X 2GB		40000 Mtexels/sec
	Difference: 52544 (131%)

Pixel Rate

The Radeon R9 M390X should be quite a bit (approximately 45%) better at AA than the Radeon R7 250X 2GB, and also capable of handling higher resolutions while still performing well. (explain)

Radeon R9 M390X		23136 Mpixels/sec
Radeon R7 250X 2GB		16000 Mpixels/sec
	Difference: 7136 (45%)

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: Memory bandwidth is the max amount of information (counted in MB per second) that can be transported past the external memory interface within a second. The number is worked out by multiplying the card's interface width by the speed of its memory. If it uses DDR type memory, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the memory bandwidth, 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 per second. This is worked out by multiplying the total amount of texture units of the card by the core clock speed of the chip. The better the texel rate, the better the 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 maximum amount of pixels the video card can possibly record to the local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate also depends on lots of other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.