GeForce GTX 860M vs Radeon R9 M265X

Intro

Compare that to the Radeon R9 M265X, which has GPU core speed of 575 MHz, and 2048 MB of GDDR5 RAM running at 1125 MHz through a 128-bit bus. It also is made up of 640 SPUs, 40 TAUs, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

The Radeon R9 M265X should in theory perform a bit faster than the GeForce GTX 860M in general. (explain)

Radeon R9 M265X		72000 MB/sec
GeForce GTX 860M		64000 MB/sec
	Difference: 8000 (13%)

Texel Rate

The GeForce GTX 860M will be quite a bit (approximately 233%) more effective at AF than the Radeon R9 M265X. (explain)

GeForce GTX 860M		76512 Mtexels/sec
Radeon R9 M265X		23000 Mtexels/sec
	Difference: 53512 (233%)

Pixel Rate

The GeForce GTX 860M should be a lot (more or less 39%) faster with regards to anti-aliasing than the Radeon R9 M265X, and should be able to handle higher screen resolutions without losing too much performance. (explain)

GeForce GTX 860M		12752 Mpixels/sec
Radeon R9 M265X		9200 Mpixels/sec
	Difference: 3552 (39%)

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 largest amount of information (in units of megabytes per second) that can be transferred across the external memory interface in a second. The number is calculated by multiplying the card's interface width by its memory speed. In the case of DDR type memory, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the bandwidth is, the faster the card will be in general. It especially helps with AA, 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 number is calculated by multiplying the total amount of texture units of the card by the core speed of the chip. The higher this number, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

Pixel Rate: Pixel rate is the most pixels the video card can possibly write to the local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the number of Raster Operations Pipelines by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate is also dependant on quite a few other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.