GeForce GTX 850M vs Radeon R9 M380

Intro

Compare that to the Radeon R9 M380, which features a clock frequency of 1000 MHz and a GDDR5 memory speed of 1500 MHz. It also features a 128-bit bus, and uses a 28 nm design. It is comprised of 640 SPUs, 40 TAUs, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

The Radeon R9 M380 should in theory be much faster than the GeForce GTX 850M overall. (explain)

Radeon R9 M380		96000 MB/sec
GeForce GTX 850M		32000 MB/sec
	Difference: 64000 (200%)

Texel Rate

The Radeon R9 M380 will be a bit (about 14%) faster with regards to anisotropic filtering than the GeForce GTX 850M. (explain)

Radeon R9 M380		40000 Mtexels/sec
GeForce GTX 850M		35040 Mtexels/sec
	Difference: 4960 (14%)

Pixel Rate

If using high levels of AA is important to you, then the Radeon R9 M380 is a better choice, though only just barely. (explain)

Radeon R9 M380		16000 Mpixels/sec
GeForce GTX 850M		14016 Mpixels/sec
	Difference: 1984 (14%)

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 data (in units of MB per second) that can be transferred over the external memory interface in one second. It is calculated by multiplying the card's interface width by its memory speed. If it uses DDR memory, the result should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are applied in one second. This number is worked out by multiplying the total texture units of the card by the core clock speed of the chip. The higher this number, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card could possibly record to its local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the number of Render Output Units by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate also depends on lots of other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.