GeForce 940M vs GeForce GTX 850M

Intro

Compare all that to the GeForce GTX 850M, which comes with clock speeds of 876 MHz on the GPU, and 1000 MHz on the 2048 MB of DDR3 memory. It features 640 SPUs as well as 40 TAUs and 16 Rasterization Operator Units.

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 850M		3340 points
GeForce 940M		1740 points
	Difference: 1600 (92%)

Power Usage and Theoretical Benchmarks

Memory Bandwidth

The GeForce GTX 850M, in theory, should perform quite a bit faster than the GeForce 940M in general. (explain)

GeForce GTX 850M		32000 MB/sec
GeForce 940M		16000 MB/sec
	Difference: 16000 (100%)

Texel Rate

The GeForce GTX 850M should be a lot (about 36%) more effective at AF than the GeForce 940M. (explain)

GeForce GTX 850M		35040 Mtexels/sec
GeForce 940M		25728 Mtexels/sec
	Difference: 9312 (36%)

Pixel Rate

The GeForce GTX 850M will be a lot (approximately 63%) more effective at full screen anti-aliasing than the GeForce 940M, and able to handle higher resolutions better. (explain)

GeForce GTX 850M		14016 Mpixels/sec
GeForce 940M		8576 Mpixels/sec
	Difference: 5440 (63%)

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 max amount of data (measured in MB per second) that can be moved across the external memory interface in one second. It is calculated by multiplying the card's interface width by its memory clock speed. If the card has DDR RAM, it must be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels the video card can possibly write to its local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate is also dependant on many other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the max fill rate.