GeForce 825M vs GeForce GTX 980

Intro

Compare those specifications to the GeForce GTX 980, which has GPU clock speed of 1126 MHz, and 4096 MB of GDDR5 RAM set to run at 1750 MHz through a 256-bit bus. It also is comprised of 2048 Stream Processors, 128 Texture Address Units, and 64 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 825M		33 Watts
GeForce GTX 980		165 Watts
	Difference: 132 Watts (400%)

Memory Bandwidth

Theoretically speaking, the GeForce GTX 980 is 1456% quicker than the GeForce 825M in general, because of its greater bandwidth. (explain)

GeForce GTX 980		224000 MB/sec
GeForce 825M		14400 MB/sec
	Difference: 209600 (1456%)

Texel Rate

The GeForce GTX 980 will be much (about 960%) better at texture filtering than the GeForce 825M. (explain)

GeForce GTX 980		144128 Mtexels/sec
GeForce 825M		13600 Mtexels/sec
	Difference: 130528 (960%)

Pixel Rate

The GeForce GTX 980 is much (more or less 960%) better at AA than the GeForce 825M, and will be able to handle higher screen resolutions without slowing down too much. (explain)

GeForce GTX 980		72064 Mpixels/sec
GeForce 825M		6800 Mpixels/sec
	Difference: 65264 (960%)

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 (in units of megabytes per second) that can be moved across the external memory interface in one second. It's worked out by multiplying the interface width by the speed of its memory. If the card has DDR RAM, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are processed per second. This is calculated by multiplying the total number of texture units of the card by the core 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 applied in one second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card can possibly write to its local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate also depends on lots of other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the max fill rate.