Radeon R7 250 vs Radeon R9 M270X

Intro

Compare all of that to the Radeon R9 M270X, which has a clock frequency of 725 MHz and a GDDR5 memory frequency of 1125 MHz. It also features a 128-bit memory bus, and makes use of a 28 nm design. It is comprised of 640 SPUs, 40 Texture Address Units, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

As far as performance goes, the Radeon R7 250 should in theory be a bit better than the Radeon R9 M270X in general. (explain)

Radeon R7 250		73600 MB/sec
Radeon R9 M270X		72000 MB/sec
	Difference: 1600 (2%)

Texel Rate

The Radeon R9 M270X is a lot (approximately 21%) faster with regards to AF than the Radeon R7 250. (explain)

Radeon R9 M270X		29000 Mtexels/sec
Radeon R7 250		24000 Mtexels/sec
	Difference: 5000 (21%)

Pixel Rate

The Radeon R9 M270X will be quite a bit (more or less 45%) faster with regards to AA than the Radeon R7 250, and also should be able to handle higher screen resolutions while still performing well. (explain)

Radeon R9 M270X		11600 Mpixels/sec
Radeon R7 250		8000 Mpixels/sec
	Difference: 3600 (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 largest amount of information (in units of megabytes per second) that can be transported across the external memory interface in a second. It's worked out by multiplying the interface width by the speed of its memory. In the case of DDR type memory, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be processed per second. This is calculated 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 card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a 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. The figure is worked out by multiplying the number of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate is also dependant on quite a few other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.