GeForce GTX 850M vs Geforce GTX 680

Intro

Compare that to the Geforce GTX 680, which features GPU clock speed of 1006 MHz, and 2048 MB of GDDR5 RAM running at 1502 MHz through a 256-bit bus. It also is comprised of 1536 Stream Processors, 128 Texture Address Units, and 32 ROPs.

Display Graphs

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Benchmarks

These are real-world performance benchmarks that were submitted by Hardware Compare users. The scores seen here are the average of all benchmarks submitted for each respective test and hardware.

3DMark Fire Strike Graphics Score

Geforce GTX 680		7650 points
GeForce GTX 850M		3340 points
	Difference: 4310 (129%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 850M		40 Watts
Geforce GTX 680		195 Watts
	Difference: 155 Watts (388%)

Memory Bandwidth

As far as performance goes, the Geforce GTX 680 should in theory be a lot better than the GeForce GTX 850M overall. (explain)

Geforce GTX 680		192256 MB/sec
GeForce GTX 850M		32000 MB/sec
	Difference: 160256 (501%)

Texel Rate

The Geforce GTX 680 is much (more or less 267%) more effective at AF than the GeForce GTX 850M. (explain)

Geforce GTX 680		128768 Mtexels/sec
GeForce GTX 850M		35040 Mtexels/sec
	Difference: 93728 (267%)

Pixel Rate

The Geforce GTX 680 will be a lot (more or less 130%) better at full screen anti-aliasing than the GeForce GTX 850M, and will be able to handle higher resolutions more effectively. (explain)

Geforce GTX 680		32192 Mpixels/sec
GeForce GTX 850M		14016 Mpixels/sec
	Difference: 18176 (130%)

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 (measured in MB per second) that can be transported across the external memory interface in one second. The number is calculated by multiplying the interface width by its memory speed. If the card has DDR type RAM, the result should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the memory bandwidth, the better 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 applied in one second. This number is calculated by multiplying the total number of texture units of the card 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 in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card can possibly record to the local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the amount of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate also depends on many other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the max fill rate.