Radeon R9 380 2G vs Radeon R9 M275X

Intro

Compare those specs to the Radeon R9 M275X, which has a core clock frequency of 900 MHz and a GDDR5 memory speed of 1125 MHz. It also makes use of 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 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 2G		190 Watts
	Difference: 140 Watts (280%)

Memory Bandwidth

Performance-wise, the Radeon R9 380 2G should theoretically be much superior to the Radeon R9 M275X in general. (explain)

Radeon R9 380 2G		182400 MB/sec
Radeon R9 M275X		72000 MB/sec
	Difference: 110400 (153%)

Texel Rate

The Radeon R9 380 2G is quite a bit (more or less 202%) better at anisotropic filtering than the Radeon R9 M275X. (explain)

Radeon R9 380 2G		108640 Mtexels/sec
Radeon R9 M275X		36000 Mtexels/sec
	Difference: 72640 (202%)

Pixel Rate

The Radeon R9 380 2G is quite a bit (more or less 116%) more effective at FSAA than the Radeon R9 M275X, and will be able to handle higher screen resolutions more effectively. (explain)

Radeon R9 380 2G		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: Memory bandwidth is the maximum amount of data (measured in megabytes per second) that can be transported across the external memory interface in one second. The number is worked out by multiplying the card's bus width by the speed of its memory. In the case of DDR type RAM, it should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the faster 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 are applied per second. This figure is worked out by multiplying the total texture units by the core speed of the chip. The higher the texel rate, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the most pixels that the graphics card can possibly record to its local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate is also dependant on many other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the max fill rate.