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GeForce GTX 860M vs Radeon R9 M365X

Intro

The GeForce GTX 860M has core speeds of 797 MHz on the GPU, and 1000 MHz on the 4096 MB of GDDR5 RAM. It features 1152 SPUs along with 96 TAUs and 16 ROPs.

Compare all that to the Radeon R9 M365X, which uses a 28 nm design. AMD has set the core frequency at 925 MHz. The GDDR5 memory is set to run at a speed of 1125 MHz on this card. It features 640 SPUs along with 40 TAUs and 16 Rasterization Operator Units.

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

Performance-wise, the Radeon R9 M365X should in theory be just a bit better than the GeForce GTX 860M in general. (explain)

Radeon R9 M365X		72000 MB/sec
GeForce GTX 860M		64000 MB/sec
	Difference: 8000 (13%)

Texel Rate

The GeForce GTX 860M will be a lot (about 107%) more effective at texture filtering than the Radeon R9 M365X. (explain)

GeForce GTX 860M		76512 Mtexels/sec
Radeon R9 M365X		37000 Mtexels/sec
	Difference: 39512 (107%)

Pixel Rate

The Radeon R9 M365X should be a little bit (approximately 16%) more effective at full screen anti-aliasing than the GeForce GTX 860M, and also able to handle higher screen resolutions without slowing down too much. (explain)

Radeon R9 M365X		14800 Mpixels/sec
GeForce GTX 860M		12752 Mpixels/sec
	Difference: 2048 (16%)

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

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GeForce GTX 860M

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Radeon R9 M365X

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Specifications

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Model	GeForce GTX 860M	Radeon R9 M365X
Manufacturer	nVidia	AMD
Year	March 12 2014	2015
Code Name	GM107	Cape Verde
Memory	4096 MB	4096 MB
Core Speed	797 MHz	925 MHz
Memory Speed	4000 MHz	4500 MHz
Power (Max TDP)	45 watts	(Unknown) watts
Bandwidth	64000 MB/sec	72000 MB/sec
Texel Rate	76512 Mtexels/sec	37000 Mtexels/sec
Pixel Rate	12752 Mpixels/sec	14800 Mpixels/sec
Unified Shaders	1152	640
Texture Mapping Units	96	40
Render Output Units	16	16
Bus Type	GDDR5	GDDR5
Bus Width	128-bit	128-bit
Fab Process	28 nm	28 nm
Transistors	(Unknown) million	(Unknown) million
Bus	PCIe 3.0 x16	PCIe 3.0 x16
DirectX Version	DirectX 12	DirectX 12
OpenGL Version	OpenGL 4.5	OpenGL 4.3

Memory Bandwidth: Memory bandwidth is the max amount of information (in units of megabytes per second) that can be transported across the external memory interface in a second. It is worked out by multiplying the card's interface width by the speed of its memory. If the card has DDR memory, the result should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. 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 number of texture map elements (texels) that can be processed per second. This figure is worked out by multiplying the total amount of texture units of the card by the core clock speed of the chip. The better this number, the better the graphics 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 could possibly write to the local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the amount of Render Output Units by the the core clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate is also dependant on lots of other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.

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