GeForce GTX 880M vs Radeon R9 M390X

Intro

Compare those specifications to the Radeon R9 M390X, which makes use of a 28 nm design. AMD has set the core frequency at 723 MHz. The GDDR5 RAM is set to run at a speed of 1250 MHz on this particular model. It features 2048 SPUs as well as 128 Texture Address Units and 32 ROPs.

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

Theoretically, the Radeon R9 M390X should be much faster than the GeForce GTX 880M in general. (explain)

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

Texel Rate

The GeForce GTX 880M should be a lot (about 32%) more effective at AF than the Radeon R9 M390X. (explain)

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

Pixel Rate

The GeForce GTX 880M will be quite a bit (approximately 32%) faster with regards to full screen anti-aliasing than the Radeon R9 M390X, and also should be able to handle higher screen resolutions better. (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 max amount of information (measured in megabytes per second) that can be transferred across the external memory interface in a second. It is worked out by multiplying the card's interface width by the speed of its memory. If it uses DDR RAM, the result should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels the video card could possibly record to its local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the number of ROPs 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 lots of other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.