Nvidia inaugurated the 900M series in October 2014 with the GeForce GTX 980M and GTX 970M, real innovations that ushered in new Maxwell chips of the second generation.
GeForce GTX 960M and GeForce GTX 950M: pay attention to the DDR3 version
The GeForce GTX 960M and GTX 950M as for them, although they are stamped « new ! On the brand's website, are GTX 860M and GTX 850M to which we added a few megahertz, supposed to justify a new name.
We thus find the same GM107 chips, architecture Maxwell first generation, the same number of CUDA calculation units, that is to say 640, and the same memory specifications, with a maximum of 4 GB of GDDR5 interfaced on 128 bits and clocked at 5 GHz.
The only changes concern the frequencies. From the GTX 860M to the GTX 960M, the native frequency has increased from 1029 to 1096 MHz, a modest increase of 6.5%. From the GTX 850M to the GTX 950M, the native frequency does not increase, it decreases! It goes from 936 to 914 MHz, a drop of just over 2%. We can assume that the Boost frequency is rising, but it is not communicated – it depends a lot on the thermal properties of this or that laptop – so it's not a certainty.
Nvidia inaugurates a DDR3 variant of the GTX 950M, whose 4 GB (maximum) of DDR3 are interfaced on 128 bits but clocked at only 2 GHz, a bandwidth down by 60%. We must avoid this model and not be fooled by this "GTX" at a discount.
GeForce 840M, GeForce 830M and GeForce 820M: to affix a logo
Nvidia also introduced the GeForce 940M, 930M and 920M, timidly advanced but boldly renamed versions of the 840M, 830M and 820M.
The 940M and 930M are therefore based on the same generation GM108 Maxwell chip, with respectively 384 and 256 computing units, clocked at 1072 MHz instead of 1029. Nvidia claims performance 4 and 3.5 times higher than the Intel HD Graphics GPU 4400 built into some Intel processors.