GeForce 825M vs Radeon R9 M395X

Intro

Compare those specs to the Radeon R9 M395X, which features clock speeds of 723 MHz on the GPU, and 1250 MHz on the 4096 MB of GDDR5 memory. It features 2048 SPUs as well as 128 Texture Address Units and 32 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 825M		33 Watts
Radeon R9 M395X		125 Watts
	Difference: 92 Watts (279%)

Memory Bandwidth

The Radeon R9 M395X, in theory, should perform a lot faster than the GeForce 825M in general. (explain)

Radeon R9 M395X		160000 MB/sec
GeForce 825M		14400 MB/sec
	Difference: 145600 (1011%)

Texel Rate

The Radeon R9 M395X should be much (more or less 580%) more effective at AF than the GeForce 825M. (explain)

Radeon R9 M395X		92544 Mtexels/sec
GeForce 825M		13600 Mtexels/sec
	Difference: 78944 (580%)

Pixel Rate

The Radeon R9 M395X is much (about 240%) better at FSAA than the GeForce 825M, and able to handle higher resolutions without losing too much performance. (explain)

Radeon R9 M395X		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 maximum amount of data (measured in MB per second) that can be transported over the external memory interface within a second. The number is worked out by multiplying the bus width by the speed of its memory. In the case of DDR type memory, it should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are processed in one second. This number 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 applied in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card can possibly record to its local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of Render Output Units 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, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.