Radeon R7 250 vs Radeon R9 M265X

Intro

Compare all that to the Radeon R9 M265X, which has a GPU core clock speed of 575 MHz, and 2048 MB of GDDR5 memory running at 1125 MHz through a 128-bit bus. It also is made up of 640 SPUs, 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 be 2% quicker than the Radeon R9 M265X in general, because of its greater data rate. (explain)

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

Texel Rate

The Radeon R7 250 will be a little bit (more or less 4%) better at 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 will be a bit (more or less 15%) faster with regards to full screen anti-aliasing than the Radeon R7 250, and also will be capable of handling higher resolutions without slowing down too much. (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: Bandwidth is the largest amount of data (counted in megabytes per second) that can be transferred past the external memory interface in a second. It is worked out by multiplying the bus width by the speed of its memory. In the case of DDR type RAM, 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 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 amount of texture map elements (texels) that are processed per second. This is calculated by multiplying the total texture units by the core speed of the chip. The better the texel rate, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip can possibly record to its local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of Raster Operations Pipelines by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate also depends 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.