Radeon R7 250 vs Radeon R9 M265X

Intro

Compare that to the Radeon R9 M265X, which has GPU core speed of 575 MHz, and 2048 MB of GDDR5 RAM running at 1125 MHz through a 128-bit bus. It also features 640 Stream Processors, 40 TAUs, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

In theory, the Radeon R7 250 should perform a bit faster than the Radeon R9 M265X overall. (explain)

Radeon R7 250		73600 MB/sec
Radeon R9 M265X		72000 MB/sec
	Difference: 1600 (2%)

Texel Rate

The Radeon R7 250 should be a bit (more or less 4%) faster with regards to texture filtering than the Radeon R9 M265X. (explain)

Radeon R7 250		24000 Mtexels/sec
Radeon R9 M265X		23000 Mtexels/sec
	Difference: 1000 (4%)

Pixel Rate

The Radeon R9 M265X should be a little bit (more or less 15%) better at anti-aliasing than the Radeon R7 250, and also will be capable of handling higher screen resolutions without losing too much performance. (explain)

Radeon R9 M265X		9200 Mpixels/sec
Radeon R7 250		8000 Mpixels/sec
	Difference: 1200 (15%)

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 largest amount of information (in units of MB per second) that can be transported past the external memory interface in a second. It is calculated by multiplying the interface width by its memory clock speed. If it uses DDR type memory, it should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the bandwidth is, the better the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the most pixels that the graphics chip could possibly write to its local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of colour ROPs by the the core 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 fill rate also depends on lots of other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.