GeForce 825M vs Radeon R9 390X 8G

Intro

Compare that to the Radeon R9 390X 8G, which uses a 28 nm design. AMD has set the core speed at 1050 MHz. The GDDR5 RAM runs at a speed of 1500 MHz on this specific model. It features 2816 SPUs along with 176 TAUs and 64 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 825M		33 Watts
Radeon R9 390X 8G		275 Watts
	Difference: 242 Watts (733%)

Memory Bandwidth

The Radeon R9 390X 8G should in theory perform much faster than the GeForce 825M in general. (explain)

Radeon R9 390X 8G		384000 MB/sec
GeForce 825M		14400 MB/sec
	Difference: 369600 (2567%)

Texel Rate

The Radeon R9 390X 8G will be much (about 1259%) faster with regards to texture filtering than the GeForce 825M. (explain)

Radeon R9 390X 8G		184800 Mtexels/sec
GeForce 825M		13600 Mtexels/sec
	Difference: 171200 (1259%)

Pixel Rate

The Radeon R9 390X 8G will be quite a bit (about 888%) better at FSAA than the GeForce 825M, and will be able to handle higher screen resolutions without slowing down too much. (explain)

Radeon R9 390X 8G		67200 Mpixels/sec
GeForce 825M		6800 Mpixels/sec
	Difference: 60400 (888%)

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 maximum amount of information (counted in MB per second) that can be moved across the external memory interface in a second. It is calculated by multiplying the card's bus width by its memory clock speed. If the card has DDR type RAM, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are processed per second. This number is worked out by multiplying the total texture units by the core clock speed of the chip. The higher this number, 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 that the graphics card could possibly record to the local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the number of Render Output Units by the clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate is also dependant on quite a few other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.