GeForce GTX 850M vs Radeon R9 M295X

Intro

Compare those specs to the Radeon R9 M295X, which comes with core speeds of 750 MHz on the GPU, and 1375 MHz on the 4096 MB of GDDR5 memory. It features 2048 SPUs as well as 128 TAUs and 32 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 850M		40 Watts
Radeon R9 M295X		125 Watts
	Difference: 85 Watts (213%)

Memory Bandwidth

As far as performance goes, the Radeon R9 M295X should in theory be much superior to the GeForce GTX 850M overall. (explain)

Radeon R9 M295X		176000 MB/sec
GeForce GTX 850M		32000 MB/sec
	Difference: 144000 (450%)

Texel Rate

The Radeon R9 M295X is much (more or less 174%) more effective at texture filtering than the GeForce GTX 850M. (explain)

Radeon R9 M295X		96000 Mtexels/sec
GeForce GTX 850M		35040 Mtexels/sec
	Difference: 60960 (174%)

Pixel Rate

If running with lots of anti-aliasing is important to you, then the Radeon R9 M295X is a better choice, by far. (explain)

Radeon R9 M295X		24000 Mpixels/sec
GeForce GTX 850M		14016 Mpixels/sec
	Difference: 9984 (71%)

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 maximum amount of information (in units of megabytes per second) that can be transferred past the external memory interface within a second. The number is worked out by multiplying the interface width by its memory speed. In the case of DDR memory, it should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, 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 amount of texture map elements (texels) that are applied in one second. This is worked out by multiplying the total texture units by the core speed of the chip. The better 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 number of pixels the video card could possibly record to the 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 core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate is also dependant on quite a few other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the max fill rate.