GeForce GTX 850M vs Geforce GTX 670

Intro

Compare all that to the Geforce GTX 670, which comes with GPU clock speed of 915 MHz, and 2048 MB of GDDR5 memory set to run at 1500 MHz through a 256-bit bus. It also is made up of 1344 Stream Processors, 112 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 670		7351 points
GeForce GTX 850M		3340 points
	Difference: 4011 (120%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 850M		40 Watts
Geforce GTX 670		170 Watts
	Difference: 130 Watts (325%)

Memory Bandwidth

In theory, the Geforce GTX 670 should be a lot faster than the GeForce GTX 850M overall. (explain)

Geforce GTX 670		192000 MB/sec
GeForce GTX 850M		32000 MB/sec
	Difference: 160000 (500%)

Texel Rate

The Geforce GTX 670 should be much (more or less 192%) more effective at anisotropic filtering than the GeForce GTX 850M. (explain)

Geforce GTX 670		102480 Mtexels/sec
GeForce GTX 850M		35040 Mtexels/sec
	Difference: 67440 (192%)

Pixel Rate

The Geforce GTX 670 will be quite a bit (approximately 109%) better at FSAA than the GeForce GTX 850M, and will be able to handle higher screen resolutions more effectively. (explain)

Geforce GTX 670		29280 Mpixels/sec
GeForce GTX 850M		14016 Mpixels/sec
	Difference: 15264 (109%)

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 (in units of megabytes per second) that can be transferred over the external memory interface in a second. It's calculated by multiplying the bus width by its memory speed. If it uses DDR type memory, it should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the card's memory bandwidth, the faster 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 texture map elements (texels) that are applied in one second. This number is calculated by multiplying the total amount of texture units of the card 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 in a second.

Pixel Rate: Pixel rate is the maximum number of pixels the video card can possibly record to its local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of colour ROPs by the the core clock speed. 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 fill rate is also dependant on quite a few other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.