GeForce GTX 860M vs Radeon R7 250X 2GB

Intro

Compare that to the Radeon R7 250X 2GB, which features a clock speed of 1000 MHz and a GDDR5 memory frequency of 1125 MHz. It also makes use of a 128-bit memory bus, and uses a 28 nm design. It is made up of 640 SPUs, 40 TAUs, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 860M		45 Watts
Radeon R7 250X 2GB		95 Watts
	Difference: 50 Watts (111%)

Memory Bandwidth

In theory, the Radeon R7 250X 2GB is 13% quicker than the GeForce GTX 860M in general, because of its higher data rate. (explain)

Radeon R7 250X 2GB		72000 MB/sec
GeForce GTX 860M		64000 MB/sec
	Difference: 8000 (13%)

Texel Rate

The GeForce GTX 860M should be a lot (approximately 91%) faster with regards to texture filtering than the Radeon R7 250X 2GB. (explain)

GeForce GTX 860M		76512 Mtexels/sec
Radeon R7 250X 2GB		40000 Mtexels/sec
	Difference: 36512 (91%)

Pixel Rate

The Radeon R7 250X 2GB should be a lot (about 25%) more effective at AA than the GeForce GTX 860M, and will be capable of handling higher resolutions more effectively. (explain)

Radeon R7 250X 2GB		16000 Mpixels/sec
GeForce GTX 860M		12752 Mpixels/sec
	Difference: 3248 (25%)

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 information (measured in MB per second) that can be moved across the external memory interface in a second. The number is calculated by multiplying the card's bus width by the speed of its memory. In the case of DDR type RAM, it must 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, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card could possibly write to its local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate also depends on quite a few other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the max fill rate.