Radeon R7 250X 2GB vs Radeon R9 M265X

Intro

Compare those specifications to the Radeon R9 M265X, which makes use of a 28 nm design. AMD has set the core frequency at 575 MHz. The GDDR5 RAM is set to run at a speed of 1125 MHz on this specific card. It features 640 SPUs as well as 40 TAUs and 16 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

Both cards have the exact same bandwidth, so in theory they should have the same performance. (explain)

Texel Rate

The Radeon R7 250X 2GB should be quite a bit (about 74%) more effective at anisotropic filtering than the Radeon R9 M265X. (explain)

Radeon R7 250X 2GB		40000 Mtexels/sec
Radeon R9 M265X		23000 Mtexels/sec
	Difference: 17000 (74%)

Pixel Rate

The Radeon R7 250X 2GB is quite a bit (approximately 74%) better at FSAA than the Radeon R9 M265X, and also able to handle higher screen resolutions more effectively. (explain)

Radeon R7 250X 2GB		16000 Mpixels/sec
Radeon R9 M265X		9200 Mpixels/sec
	Difference: 6800 (74%)

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 maximum amount of data (in units of MB per second) that can be moved over the external memory interface within a second. It's worked out by multiplying the bus width by its memory speed. In the case of DDR type memory, it should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are applied per second. This figure 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 processed per second.

Pixel Rate: Pixel rate is the maximum number of pixels the video card can possibly write to the local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate also depends on many other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.