Radeon R9 M290X vs Radeon R9 M395X

Intro

Compare all that to the Radeon R9 M395X, which comes with GPU clock speed of 723 MHz, and 4096 MB of GDDR5 RAM set to run 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 M290X		100 Watts
Radeon R9 M395X		125 Watts
	Difference: 25 Watts (25%)

Memory Bandwidth

In theory, the Radeon R9 M395X should perform a bit faster than the Radeon R9 M290X overall. (explain)

Radeon R9 M395X		160000 MB/sec
Radeon R9 M290X		153600 MB/sec
	Difference: 6400 (4%)

Texel Rate

The Radeon R9 M395X should be a lot (approximately 36%) faster with regards to texture filtering than the Radeon R9 M290X. (explain)

Radeon R9 M395X		92544 Mtexels/sec
Radeon R9 M290X		68000 Mtexels/sec
	Difference: 24544 (36%)

Pixel Rate

If using a high resolution is important to you, then the Radeon R9 M290X is the winner, though not by far. (explain)

Radeon R9 M290X		27200 Mpixels/sec
Radeon R9 M395X		23136 Mpixels/sec
	Difference: 4064 (18%)

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 (counted in MB per second) that can be moved past the external memory interface in a second. It's worked out by multiplying the interface width by its memory speed. In the case of DDR type memory, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are processed in one second. This is worked out by multiplying the total texture units of the card by the core speed of the chip. The higher the texel rate, the better the 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 amount of pixels the graphics card can possibly record to the 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 clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate also depends on quite a few other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the max fill rate.