GeForce GTX 950M vs Radeon R9 M390X

Intro

Compare those specs to the Radeon R9 M390X, 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)

GeForce GTX 950M		55 Watts
Radeon R9 M390X		125 Watts
	Difference: 70 Watts (127%)

Memory Bandwidth

In theory, the Radeon R9 M390X will be 400% quicker than the GeForce GTX 950M overall, because of its greater bandwidth. (explain)

Radeon R9 M390X		160000 MB/sec
GeForce GTX 950M		32000 MB/sec
	Difference: 128000 (400%)

Texel Rate

The Radeon R9 M390X is quite a bit (about 153%) more effective at anisotropic filtering than the GeForce GTX 950M. (explain)

Radeon R9 M390X		92544 Mtexels/sec
GeForce GTX 950M		36560 Mtexels/sec
	Difference: 55984 (153%)

Pixel Rate

The Radeon R9 M390X will be quite a bit (more or less 58%) faster with regards to FSAA than the GeForce GTX 950M, and will be able to handle higher resolutions without losing too much performance. (explain)

Radeon R9 M390X		23136 Mpixels/sec
GeForce GTX 950M		14624 Mpixels/sec
	Difference: 8512 (58%)

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 (counted in MB per second) that can be transferred over the external memory interface in one second. The number is calculated by multiplying the card's interface width by its memory clock 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 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 are processed per second. This number is calculated by multiplying the total amount of texture units by the core speed of the chip. The better the texel rate, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

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