Radeon R9 M275X vs Radeon RX 480 4GB

Intro

Compare those specifications to the Radeon RX 480 4GB, which has a GPU core clock speed of 1120 MHz, and 4096 MB of GDDR5 RAM set to run at 1750 MHz through a 256-bit bus. It also is made up of 2304 Stream Processors, 144 Texture Address Units, and 32 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 M275X		50 Watts
Radeon RX 480 4GB		150 Watts
	Difference: 100 Watts (200%)

Memory Bandwidth

The Radeon RX 480 4GB, in theory, should be quite a bit faster than the Radeon R9 M275X overall. (explain)

Radeon RX 480 4GB		229376 MB/sec
Radeon R9 M275X		72000 MB/sec
	Difference: 157376 (219%)

Texel Rate

The Radeon RX 480 4GB will be much (about 348%) better at anisotropic filtering than the Radeon R9 M275X. (explain)

Radeon RX 480 4GB		161280 Mtexels/sec
Radeon R9 M275X		36000 Mtexels/sec
	Difference: 125280 (348%)

Pixel Rate

The Radeon RX 480 4GB should be quite a bit (more or less 149%) faster with regards to FSAA than the Radeon R9 M275X, and also will be able to handle higher screen resolutions without losing too much performance. (explain)

Radeon RX 480 4GB		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 largest amount of information (in units of megabytes per second) that can be transferred past the external memory interface in a second. It is calculated by multiplying the bus width by its memory speed. In the case of DDR type RAM, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the bandwidth is, 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 number of texture map elements (texels) that are applied per second. This number is worked out by multiplying the total amount of texture units of the card by the core clock speed of the chip. The higher the texel rate, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in one second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip can possibly record to the local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate also depends on lots of other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.