GeForce GTX 860M 

not even close to the same. Maxwell has half the cuda cores and more than twice the clock speed and higher memory. Newer architecture and its also way more power efficient - It scores and performs higher in every bench than the kepler by like 10-20% (%based vs each other) - There is a Maxwell and Kepler for both versions, 2gb and 4gb so the only way to tell which version it is is by checking the active clock/memory speed with cpu -z or a similar program.

It's basically the same, except the memory So, it has the same score for both 2GB and 4GB edition You could check it out on this website http://www.game-debate.com/gpu/index.php?gid=2291&gid2=2143&compare=geforce-gtx-860m-4gb-vs-geforce-gtx-860m-2gb

Pretty sure they need to put up something for GTX 860M 4GB also ( and not just 2GB's ) Maybe on the same page? There's hardly any difference, but bigger memory :D

lol no no no....i had the lenovo, the keyboard flexes and broke and I sent it back....plus you get that horrible glossy screen instead of the nitro's gorgeous matte ips display (they may have added an ips to it.) Plus I was able to buy it with a 256gb ssd and 1tb hdd already installed and ready to go. Last, build quality was about 1000% better on nitro. The materials on the lenovo felt like plastics from a mid 80's general motors vehicle. lmao at "the motherboard will break down after awhile." Where is this brilliant insight from since they are using a brand new proprietary motherboard with intel architecture?

Had a nitro - Cheap manufacturer - Motherboard will break down after awhile - decided to purchase the gamer edition of the lenovo y70-70 and just installed my own crucial ssd - i recommend this instead if you are looking for a powerhouse slimline system

acer nitro has it in 4gb. I love it. Running gta v right now on high and ultra high settings smoothly. For my needs the 860m is great and the ssd is still amazing me after 2 months. So is the ips screen. And it's low profile to boot. No "i'm a gamer" badges. http://amzn.com/B00RGMF4YM

GTX 860M has a 4GB Maxwell edition! where is it? is there any difference in performance between the 2GB & 4GB editions?

This thing has almost the specs of a older GTX 650 Ti, So this would be very very good with a tiny laptop screen. But for the price you pay they shoul do much better than this. They are holding out on us big time!