GeForce 825M vs Radeon R9 M390X

Intro

Compare those specifications to the Radeon R9 M390X, which comes with a core clock frequency 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

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 825M		33 Watts
Radeon R9 M390X		125 Watts
	Difference: 92 Watts (279%)

Memory Bandwidth

As far as performance goes, the Radeon R9 M390X should theoretically be quite a bit superior to the GeForce 825M in general. (explain)

Radeon R9 M390X		160000 MB/sec
GeForce 825M		14400 MB/sec
	Difference: 145600 (1011%)

Texel Rate

The Radeon R9 M390X is a lot (more or less 580%) faster with regards to anisotropic filtering than the GeForce 825M. (explain)

Radeon R9 M390X		92544 Mtexels/sec
GeForce 825M		13600 Mtexels/sec
	Difference: 78944 (580%)

Pixel Rate

The Radeon R9 M390X should be much (about 240%) faster with regards to full screen anti-aliasing than the GeForce 825M, and capable of handling higher resolutions more effectively. (explain)

Radeon R9 M390X		23136 Mpixels/sec
GeForce 825M		6800 Mpixels/sec
	Difference: 16336 (240%)

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 largest amount of data (counted in MB per second) that can be moved over the external memory interface within a second. It's calculated by multiplying the card's interface width by its memory clock speed. If it uses DDR type RAM, the result should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the bandwidth is, 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 can be applied in one second. This is worked out by multiplying the total amount of 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 applied per second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip can possibly record to the local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate also depends on lots of other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.