Radeon R9 M275X vs Radeon RX 480

Intro

Compare those specifications to the Radeon RX 480, which features a GPU core clock speed of 1120 MHz, and 8192 MB of GDDR5 memory set to run at 2000 MHz through a 256-bit bus. It also is made up of 2304 SPUs, 144 Texture Address Units, and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 M275X		50 Watts
Radeon RX 480		150 Watts
	Difference: 100 Watts (200%)

Memory Bandwidth

The Radeon RX 480 should in theory be much faster than the Radeon R9 M275X overall. (explain)

Radeon RX 480		262144 MB/sec
Radeon R9 M275X		72000 MB/sec
	Difference: 190144 (264%)

Texel Rate

The Radeon RX 480 is much (about 348%) faster with regards to texture filtering than the Radeon R9 M275X. (explain)

Radeon RX 480		161280 Mtexels/sec
Radeon R9 M275X		36000 Mtexels/sec
	Difference: 125280 (348%)

Pixel Rate

The Radeon RX 480 is quite a bit (about 149%) faster with regards to AA than the Radeon R9 M275X, and should be capable of handling higher screen resolutions better. (explain)

Radeon RX 480		35840 Mpixels/sec
Radeon R9 M275X		14400 Mpixels/sec
	Difference: 21440 (149%)

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 maximum amount of information (in units of megabytes per second) that can be transferred over the external memory interface within a second. It's worked out by multiplying the bus width by its memory clock speed. If the card has DDR RAM, the result should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be processed per second. This is calculated by multiplying the total texture units by the core clock speed of the chip. The higher the texel rate, the better the video card will be at 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 graphics card can possibly record to the local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - aka 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 of the card - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.