Radeon R9 380 4G vs Radeon R9 M295X

Intro

Compare those specs to the Radeon R9 M295X, which comes with a GPU core clock speed of 750 MHz, and 4096 MB of GDDR5 RAM set to run at 1375 MHz through a 256-bit bus. It also is made up of 2048 Stream Processors, 128 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 M295X		125 Watts
Radeon R9 380 4G		190 Watts
	Difference: 65 Watts (52%)

Memory Bandwidth

Performance-wise, the Radeon R9 380 4G should in theory be a small bit superior to the Radeon R9 M295X in general. (explain)

Radeon R9 380 4G		182400 MB/sec
Radeon R9 M295X		176000 MB/sec
	Difference: 6400 (4%)

Texel Rate

The Radeon R9 380 4G will be a bit (more or less 13%) better at anisotropic filtering than the Radeon R9 M295X. (explain)

Radeon R9 380 4G		108640 Mtexels/sec
Radeon R9 M295X		96000 Mtexels/sec
	Difference: 12640 (13%)

Pixel Rate

The Radeon R9 380 4G will be a lot (more or less 29%) better at AA than the Radeon R9 M295X, and able to handle higher screen resolutions better. (explain)

Radeon R9 380 4G		31040 Mpixels/sec
Radeon R9 M295X		24000 Mpixels/sec
	Difference: 7040 (29%)

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 max amount of information (measured in megabytes per second) that can be transported across the external memory interface within a second. The number is calculated by multiplying the card's interface width by its memory clock speed. If the card has DDR memory, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be applied in one second. This figure is calculated by multiplying the total texture units by the core clock speed of the chip. The better the texel rate, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip can possibly write to the local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the number of Raster Operations Pipelines by the clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate is also dependant on quite a few other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.