Radeon R9 380X vs Radeon R9 M395X

Intro

Compare those specifications to the Radeon R9 M395X, which features a GPU core clock speed of 723 MHz, and 4096 MB of GDDR5 RAM running at 1250 MHz through a 256-bit bus. It also is made up of 2048 SPUs, 128 Texture Address Units, and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 M395X		125 Watts
Radeon R9 380X		190 Watts
	Difference: 65 Watts (52%)

Memory Bandwidth

In theory, the Radeon R9 380X will be 14% quicker than the Radeon R9 M395X in general, due to its greater data rate. (explain)

Radeon R9 380X		182400 MB/sec
Radeon R9 M395X		160000 MB/sec
	Difference: 22400 (14%)

Texel Rate

The Radeon R9 380X should be a lot (approximately 34%) better at anisotropic filtering than the Radeon R9 M395X. (explain)

Radeon R9 380X		124160 Mtexels/sec
Radeon R9 M395X		92544 Mtexels/sec
	Difference: 31616 (34%)

Pixel Rate

The Radeon R9 380X will be quite a bit (about 34%) more effective at anti-aliasing than the Radeon R9 M395X, and capable of handling higher screen resolutions better. (explain)

Radeon R9 380X		31040 Mpixels/sec
Radeon R9 M395X		23136 Mpixels/sec
	Difference: 7904 (34%)

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 data (in units of MB per second) that can be transferred over the external memory interface in one second. It's worked out by multiplying the bus width by its memory speed. If the card has DDR memory, it must be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the bandwidth is, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card could possibly write to the local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the number of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as 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, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.