Radeon R9 280 vs Radeon R9 M270X

Intro

Compare all of that to the Radeon R9 M270X, which has GPU clock speed of 725 MHz, and 2048 MB of GDDR5 memory 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

As far as performance goes, the Radeon R9 280 should theoretically be much better than the Radeon R9 M270X in general. (explain)

Radeon R9 280		240000 MB/sec
Radeon R9 M270X		72000 MB/sec
	Difference: 168000 (233%)

Texel Rate

The Radeon R9 280 should be quite a bit (approximately 260%) more effective at texture filtering than the Radeon R9 M270X. (explain)

Radeon R9 280		104496 Mtexels/sec
Radeon R9 M270X		29000 Mtexels/sec
	Difference: 75496 (260%)

Pixel Rate

If running with a high resolution is important to you, then the Radeon R9 280 is the winner, by far. (explain)

Radeon R9 280		29856 Mpixels/sec
Radeon R9 M270X		11600 Mpixels/sec
	Difference: 18256 (157%)

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 max amount of information (in units of MB per second) that can be transferred over the external memory interface within a second. The number is calculated by multiplying the bus width by the speed of its memory. If it uses DDR type memory, it must 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 anti-aliasing, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed per second. This is worked out by multiplying the total amount of texture units of the card by the core clock 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 in a second.

Pixel Rate: Pixel rate is the most pixels the video card can possibly record to its local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of Raster Operations Pipelines by the the core speed of the card. 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 is also dependant on quite a few other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the max fill rate.