GeForce 825M vs GeForce GTX 980M

Intro

Compare those specifications to the GeForce GTX 980M, which features GPU core speed of 1038 MHz, and 4096 MB of GDDR5 RAM set to run at 1000 MHz through a 256-bit bus. It also is comprised of 1536 SPUs, 96 Texture Address Units, and 64 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 825M		33 Watts
GeForce GTX 980M		100 Watts
	Difference: 67 Watts (203%)

Memory Bandwidth

Theoretically speaking, the GeForce GTX 980M should be 789% faster than the GeForce 825M overall, due to its higher data rate. (explain)

GeForce GTX 980M		128000 MB/sec
GeForce 825M		14400 MB/sec
	Difference: 113600 (789%)

Texel Rate

The GeForce GTX 980M will be quite a bit (approximately 633%) faster with regards to AF than the GeForce 825M. (explain)

GeForce GTX 980M		99648 Mtexels/sec
GeForce 825M		13600 Mtexels/sec
	Difference: 86048 (633%)

Pixel Rate

The GeForce GTX 980M should be much (more or less 877%) faster with regards to FSAA than the GeForce 825M, and capable of handling higher resolutions without losing too much performance. (explain)

GeForce GTX 980M		66432 Mpixels/sec
GeForce 825M		6800 Mpixels/sec
	Difference: 59632 (877%)

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 information (counted in MB per second) that can be moved over the external memory interface in a second. It is calculated by multiplying the bus width by the speed of its memory. If it uses DDR type memory, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the bandwidth is, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are applied per second. This number is calculated by multiplying the total amount of texture units by the core speed of the chip. The better this number, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

Pixel Rate: Pixel rate is the most pixels the graphics card can possibly record to its local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate also depends on lots of other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the max fill rate.