GeForce GTX 850M vs Geforce GTX 680

Intro

Compare all that to the Geforce GTX 680, which makes use of a 28 nm design. nVidia has clocked the core frequency at 1006 MHz. The GDDR5 RAM works at a frequency of 1502 MHz on this card. It features 1536 SPUs along with 128 Texture Address Units and 32 Rasterization Operator Units.

Display Graphs

Hide Graphs

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

In theory, the Geforce GTX 680 will be 501% faster than the GeForce GTX 850M in general, due to its higher bandwidth. (explain)

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

Texel Rate

The Geforce GTX 680 will be a lot (about 267%) better 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 is quite a bit (approximately 130%) faster with regards to anti-aliasing than the GeForce GTX 850M, and also should be able to handle higher screen 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: Bandwidth is the largest amount of information (counted in megabytes per second) that can be transferred past the external memory interface in a second. It is worked out by multiplying the card's bus width by the speed of its memory. If it uses DDR type memory, it should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the better 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 number of texture map elements (texels) that are processed per second. This figure is calculated by multiplying the total amount of texture units by the core speed of the chip. The better the texel rate, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip could possibly record to its local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate is also dependant on lots of other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the max fill rate.