Radeon R7 250X vs Radeon R9 M385X

Intro

Compare those specs to the Radeon R9 M385X, which has a GPU core clock speed of 1100 MHz, and 4096 MB of GDDR5 RAM running at 1500 MHz through a 128-bit bus. It also features 896 SPUs, 56 TAUs, and 16 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

In theory, the Radeon R9 M385X will be 33% faster than the Radeon R7 250X in general, because of its greater data rate. (explain)

Radeon R9 M385X		96000 MB/sec
Radeon R7 250X		72000 MB/sec
	Difference: 24000 (33%)

Texel Rate

The Radeon R9 M385X will be much (about 54%) better at anisotropic filtering than the Radeon R7 250X. (explain)

Radeon R9 M385X		61600 Mtexels/sec
Radeon R7 250X		40000 Mtexels/sec
	Difference: 21600 (54%)

Pixel Rate

The Radeon R9 M385X will be a little bit (about 10%) more effective at AA than the Radeon R7 250X, and capable of handling higher screen resolutions better. (explain)

Radeon R9 M385X		17600 Mpixels/sec
Radeon R7 250X		16000 Mpixels/sec
	Difference: 1600 (10%)

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 maximum amount of information (counted in megabytes per second) that can be transported across the external memory interface in a second. It's worked out by multiplying the card's bus width by its memory clock speed. If the card has DDR type memory, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. 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 amount of texture map elements (texels) that are processed 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 this number, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card can possibly write to its local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the number of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes 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 - the lower the bandwidth is, the lower the potential to get to the max fill rate.