GeForce 825M vs GeForce GTX 980

Intro

Compare all of that to the GeForce GTX 980, which comes with GPU core speed of 1126 MHz, and 4096 MB of GDDR5 RAM running at 1750 MHz through a 256-bit bus. It also features 2048 SPUs, 128 TAUs, 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 is a lot (more or less 960%) faster with regards to 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 high levels of AA is important to you, then the GeForce GTX 980 is a better choice, by far. (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 max amount of data (in units of MB per second) that can be transferred over the external memory interface within a second. The number is calculated by multiplying the interface width by the speed of its memory. If it uses DDR 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 AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are processed per second. This is worked out by multiplying the total number of texture units by the core speed of the chip. The better this number, the better the video 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 amount of pixels that the graphics card can possibly record to its local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate also depends on quite a few other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the max fill rate.