GeForce GTX 965M vs Radeon R9 M390X

Intro

Compare all of that to the Radeon R9 M390X, which features a clock speed of 723 MHz and a GDDR5 memory frequency of 1250 MHz. It also features a 256-bit memory bus, and uses a 28 nm design. It features 2048 SPUs, 128 Texture Address Units, and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 965M		60 Watts
Radeon R9 M390X		125 Watts
	Difference: 65 Watts (108%)

Memory Bandwidth

The Radeon R9 M390X, in theory, should be much faster than the GeForce GTX 965M in general. (explain)

Radeon R9 M390X		160000 MB/sec
GeForce GTX 965M		64000 MB/sec
	Difference: 96000 (150%)

Texel Rate

The Radeon R9 M390X will be much (about 53%) better at texture filtering than the GeForce GTX 965M. (explain)

Radeon R9 M390X		92544 Mtexels/sec
GeForce GTX 965M		60416 Mtexels/sec
	Difference: 32128 (53%)

Pixel Rate

The GeForce GTX 965M is much (about 31%) faster with regards to anti-aliasing than the Radeon R9 M390X, and also should be capable of handling higher resolutions without losing too much performance. (explain)

GeForce GTX 965M		30208 Mpixels/sec
Radeon R9 M390X		23136 Mpixels/sec
	Difference: 7072 (31%)

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 data (measured in megabytes per second) that can be moved across the external memory interface in a second. It's worked out by multiplying the card's interface width by its memory clock speed. If the card has DDR RAM, the result should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the card's 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 applied per second. This figure is calculated by multiplying the total amount of texture units of the card by the core speed of the chip. The higher the texel rate, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in a second.

Pixel Rate: Pixel rate is the most pixels the graphics card can possibly write to the local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the number of Raster Operations Pipelines by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on many other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the max fill rate.