GeForce GTX 880M vs Radeon R9 M390X

Intro

Compare all of that to the Radeon R9 M390X, which features GPU clock speed of 723 MHz, and 4096 MB of GDDR5 memory set to run at 1250 MHz through a 256-bit bus. It also is comprised of 2048 Stream Processors, 128 Texture Address Units, and 32 Raster Operation Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 M390X		125 Watts
GeForce GTX 880M		130 Watts
	Difference: 5 Watts (4%)

Memory Bandwidth

The Radeon R9 M390X should in theory be a lot faster than the GeForce GTX 880M overall. (explain)

Radeon R9 M390X		160000 MB/sec
GeForce GTX 880M		128000 MB/sec
	Difference: 32000 (25%)

Texel Rate

The GeForce GTX 880M is a lot (about 32%) faster with regards to anisotropic filtering than the Radeon R9 M390X. (explain)

GeForce GTX 880M		122112 Mtexels/sec
Radeon R9 M390X		92544 Mtexels/sec
	Difference: 29568 (32%)

Pixel Rate

If running with a high screen resolution is important to you, then the GeForce GTX 880M is superior to the Radeon R9 M390X, by a large margin. (explain)

GeForce GTX 880M		30528 Mpixels/sec
Radeon R9 M390X		23136 Mpixels/sec
	Difference: 7392 (32%)

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

Pixel Rate: Pixel rate is the maximum number of 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 ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate also depends on lots of other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the max fill rate.