GeForce GTX 850M vs Radeon R9 M265X

Intro

Compare those specifications to the Radeon R9 M265X, which features a core clock speed of 575 MHz and a GDDR5 memory speed 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 Texture Address Units, and 16 ROPs.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Memory Bandwidth

As far as performance goes, the Radeon R9 M265X should theoretically be quite a bit better than the GeForce GTX 850M overall. (explain)

Radeon R9 M265X		72000 MB/sec
GeForce GTX 850M		32000 MB/sec
	Difference: 40000 (125%)

Texel Rate

The GeForce GTX 850M should be quite a bit (approximately 52%) better at anisotropic filtering than the Radeon R9 M265X. (explain)

GeForce GTX 850M		35040 Mtexels/sec
Radeon R9 M265X		23000 Mtexels/sec
	Difference: 12040 (52%)

Pixel Rate

The GeForce GTX 850M should be much (more or less 52%) better at full screen anti-aliasing than the Radeon R9 M265X, and will be capable of handling higher screen resolutions without losing too much performance. (explain)

GeForce GTX 850M		14016 Mpixels/sec
Radeon R9 M265X		9200 Mpixels/sec
	Difference: 4816 (52%)

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 maximum amount of information (measured in megabytes per second) that can be transferred past the external memory interface in one second. It's worked out by multiplying the card's interface width by its memory clock speed. In the case of DDR RAM, the result should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are applied in one second. This figure is calculated by multiplying the total texture units by the core speed of the chip. The better the texel rate, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card could possibly record to the local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the number of Raster Operations Pipelines 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 fill rate is also dependant on quite a few other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.