Radeon R9 380 4G vs Radeon R9 M275X

Intro

Compare all that to the Radeon R9 M275X, which features a GPU core clock speed of 900 MHz, and 2048 MB of GDDR5 memory set to run at 1125 MHz through a 128-bit bus. It also features 640 Stream Processors, 40 Texture Address Units, and 16 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 M275X		50 Watts
Radeon R9 380 4G		190 Watts
	Difference: 140 Watts (280%)

Memory Bandwidth

Theoretically speaking, the Radeon R9 380 4G should be much faster than the Radeon R9 M275X overall. (explain)

Radeon R9 380 4G		182400 MB/sec
Radeon R9 M275X		72000 MB/sec
	Difference: 110400 (153%)

Texel Rate

The Radeon R9 380 4G is much (about 202%) faster with regards to texture filtering than the Radeon R9 M275X. (explain)

Radeon R9 380 4G		108640 Mtexels/sec
Radeon R9 M275X		36000 Mtexels/sec
	Difference: 72640 (202%)

Pixel Rate

If running with high levels of AA is important to you, then the Radeon R9 380 4G is the winner, and very much so. (explain)

Radeon R9 380 4G		31040 Mpixels/sec
Radeon R9 M275X		14400 Mpixels/sec
	Difference: 16640 (116%)

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 maximum amount of information (measured in megabytes per second) that can be moved over the external memory interface in a second. It's worked out by multiplying the card's bus width by its memory speed. If the card has DDR type memory, it should be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are processed in one second. This figure is worked out by multiplying the total texture units 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 applied in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card could possibly write to the local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate is also dependant on quite a few other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the max fill rate.