GeForce 825M vs GeForce GTX 980

Intro

Compare all that to the GeForce GTX 980, which comes with core speeds of 1126 MHz on the GPU, and 1750 MHz on the 4096 MB of GDDR5 RAM. It features 2048 SPUs as well as 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

As far as performance goes, the GeForce GTX 980 should in theory be a lot superior to the GeForce 825M overall. (explain)

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

Texel Rate

The GeForce GTX 980 will be a lot (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

If using lots of anti-aliasing is important to you, then the GeForce GTX 980 is a better choice, and very much so. (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 maximum amount of information (in units of megabytes per second) that can be moved over the external memory interface in one second. It is calculated by multiplying the bus width by its memory clock speed. In the case of DDR type memory, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed per second. This number is calculated by multiplying the total texture units by the core speed of the chip. The higher the texel rate, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed 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 number is worked out by multiplying the amount of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate also depends on lots of other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.