Radeon R9 380 4G vs Radeon R9 M275X

Intro

Compare those specifications to the Radeon R9 M275X, which comes with clock speeds of 900 MHz on the GPU, and 1125 MHz on the 2048 MB of GDDR5 memory. It features 640 SPUs as well as 40 TAUs and 16 Rasterization Operator 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

As far as performance goes, the Radeon R9 380 4G should theoretically be much better than the Radeon R9 M275X in general. (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 quite a bit (more or less 202%) more effective at AF 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 a high resolution is important to you, then the Radeon R9 380 4G is a better choice, by a large margin. (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: Memory bandwidth is the max amount of data (measured in megabytes per second) that can be moved over the external memory interface within a second. It's calculated by multiplying the card's interface width by the speed of its memory. If it uses DDR memory, the result should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are applied in one second. This figure is worked out by multiplying the total amount of texture units of the card by the core clock speed of the chip. The higher 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 maximum amount of pixels the video card can possibly record to the local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the number of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on many other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.