Radeon R9 380X vs Radeon R9 M295X

Intro

Compare those specs to the Radeon R9 M295X, which comes with GPU clock speed of 750 MHz, and 4096 MB of GDDR5 RAM set to run at 1375 MHz through a 256-bit bus. It also features 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 380X		190 Watts
	Difference: 65 Watts (52%)

Memory Bandwidth

The Radeon R9 380X, in theory, should perform a bit faster than the Radeon R9 M295X overall. (explain)

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

Texel Rate

The Radeon R9 380X is much (about 29%) better at AF than the Radeon R9 M295X. (explain)

Radeon R9 380X		124160 Mtexels/sec
Radeon R9 M295X		96000 Mtexels/sec
	Difference: 28160 (29%)

Pixel Rate

The Radeon R9 380X will be a lot (more or less 29%) better at AA than the Radeon R9 M295X, and also able to handle higher resolutions while still performing well. (explain)

Radeon R9 380X		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 data (in units of megabytes per second) that can be transferred over the external memory interface in a second. The number is calculated by multiplying the bus width by the speed of its memory. If the card has DDR memory, it should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the memory bandwidth, the better the card will be in general. It especially helps with AA, 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 is calculated by multiplying the total texture units of the card by the core speed of the chip. The higher this number, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

Pixel Rate: Pixel rate is the maximum number of pixels the video card 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 amount of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate also depends on lots of other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.