Radeon R9 380 4G vs Radeon R9 M295X

Intro

Compare all that to the Radeon R9 M295X, which features GPU clock speed of 750 MHz, and 4096 MB of GDDR5 RAM running at 1375 MHz through a 256-bit bus. It also is comprised of 2048 SPUs, 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

As far as performance goes, the Radeon R9 380 4G should in theory be just a bit better than the Radeon R9 M295X overall. (explain)

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

Texel Rate

The Radeon R9 380 4G should be just a bit (more or less 13%) better at texture 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

If using a high screen resolution is important to you, then the Radeon R9 380 4G is superior to the Radeon R9 M295X, by far. (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: Memory bandwidth is the largest amount of information (measured in megabytes per second) that can be moved past the external memory interface in a second. It's calculated by multiplying the card's interface width by its memory speed. If the card has DDR memory, the result should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip can possibly record to its local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of colour 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 output rate is also dependant on quite a few other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.