GeForce GTX 850M vs Geforce GTX 680

Intro

Compare that to the Geforce GTX 680, which features a GPU core clock speed of 1006 MHz, and 2048 MB of GDDR5 memory set to run at 1502 MHz through a 256-bit bus. It also features 1536 SPUs, 128 TAUs, 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

The Geforce GTX 680 should in theory be quite a bit faster than the GeForce GTX 850M in general. (explain)

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

Texel Rate

The Geforce GTX 680 will be much (approximately 267%) faster with regards to anisotropic filtering 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 is a lot (about 130%) better at FSAA than the GeForce GTX 850M, and capable of handling higher screen resolutions without losing too much performance. (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 largest amount of information (counted in megabytes per second) that can be transported over the external memory interface in a second. It is calculated by multiplying the card's interface width by the speed of its memory. In the case of DDR type memory, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the bandwidth is, the better the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the most pixels the graphics card could possibly write to its local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the number of Render Output Units by the the core 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 of the card - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.