GeForce GTX 860M vs Radeon R9 M275X

Intro

Compare those specs to the Radeon R9 M275X, which comes with core clock speeds of 900 MHz on the GPU, and 1125 MHz on the 2048 MB of GDDR5 RAM. It features 640 SPUs as well as 40 Texture Address Units and 16 Rasterization Operator Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 860M		45 Watts
Radeon R9 M275X		50 Watts
	Difference: 5 Watts (11%)

Memory Bandwidth

Theoretically, the Radeon R9 M275X should perform a small bit faster than the GeForce GTX 860M in general. (explain)

Radeon R9 M275X		72000 MB/sec
GeForce GTX 860M		64000 MB/sec
	Difference: 8000 (13%)

Texel Rate

The GeForce GTX 860M should be a lot (more or less 113%) more effective at AF than the Radeon R9 M275X. (explain)

GeForce GTX 860M		76512 Mtexels/sec
Radeon R9 M275X		36000 Mtexels/sec
	Difference: 40512 (113%)

Pixel Rate

If using a high screen resolution is important to you, then the Radeon R9 M275X is a better choice, but it probably won't make a huge difference. (explain)

Radeon R9 M275X		14400 Mpixels/sec
GeForce GTX 860M		12752 Mpixels/sec
	Difference: 1648 (13%)

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 max amount of information (measured in MB per second) that can be transferred past the external memory interface in one second. The number is calculated by multiplying the interface width by the speed of its memory. If it uses DDR type RAM, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. 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 are applied per second. This is calculated by multiplying the total number of texture units of the card by the core speed of the chip. The better this number, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

Pixel Rate: Pixel rate is the most pixels the video card can possibly write to the local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the number of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate is also dependant on many 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.