Radeon R9 390 8G vs Radeon R9 M295X

Intro

Compare those specs to the Radeon R9 M295X, which features core clock speeds of 750 MHz on the GPU, and 1375 MHz on the 4096 MB of GDDR5 RAM. It features 2048 SPUs as well as 128 Texture Address Units and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 M295X		125 Watts
Radeon R9 390 8G		275 Watts
	Difference: 150 Watts (120%)

Memory Bandwidth

The Radeon R9 390 8G should theoretically be much faster than the Radeon R9 M295X in general. (explain)

Radeon R9 390 8G		384000 MB/sec
Radeon R9 M295X		176000 MB/sec
	Difference: 208000 (118%)

Texel Rate

The Radeon R9 390 8G should be much (more or less 67%) better at anisotropic filtering than the Radeon R9 M295X. (explain)

Radeon R9 390 8G		160000 Mtexels/sec
Radeon R9 M295X		96000 Mtexels/sec
	Difference: 64000 (67%)

Pixel Rate

The Radeon R9 390 8G should be a lot (more or less 167%) more effective at full screen anti-aliasing than the Radeon R9 M295X, and also capable of handling higher screen resolutions more effectively. (explain)

Radeon R9 390 8G		64000 Mpixels/sec
Radeon R9 M295X		24000 Mpixels/sec
	Difference: 40000 (167%)

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 MB per second) that can be transported past the external memory interface in one second. It is worked out by multiplying the card's interface width by its memory clock speed. If the card has DDR type RAM, the result should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card could possibly record to its local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate also depends on quite a few other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.