GeForce GTX 850M vs Radeon R9 M265X

Intro

Compare those specifications to the Radeon R9 M265X, which features a GPU core clock speed of 575 MHz, and 2048 MB of GDDR5 memory running at 1125 MHz through a 128-bit bus. It also features 640 SPUs, 40 TAUs, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

In theory, the Radeon R9 M265X will be 125% faster than the GeForce GTX 850M overall, because of its higher bandwidth. (explain)

Radeon R9 M265X		72000 MB/sec
GeForce GTX 850M		32000 MB/sec
	Difference: 40000 (125%)

Texel Rate

The GeForce GTX 850M should be much (about 52%) more effective at AF than the Radeon R9 M265X. (explain)

GeForce GTX 850M		35040 Mtexels/sec
Radeon R9 M265X		23000 Mtexels/sec
	Difference: 12040 (52%)

Pixel Rate

The GeForce GTX 850M will be quite a bit (more or less 52%) better at FSAA than the Radeon R9 M265X, and also should be able to handle higher resolutions more effectively. (explain)

GeForce GTX 850M		14016 Mpixels/sec
Radeon R9 M265X		9200 Mpixels/sec
	Difference: 4816 (52%)

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 (measured in MB per second) that can be moved past the external memory interface within a second. The number is calculated by multiplying the card's interface width by its memory clock speed. If the card has DDR RAM, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are applied in one second. This figure is calculated by multiplying the total number of texture units 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 in one second.

Pixel Rate: Pixel rate is the most pixels that the graphics card can possibly record to its local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate is also dependant on quite a few other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.