As title says, I bough 2 weeks ago a 980m to Eurocom (aka upgradeyourlaptop in ebay) and from the begining card never did work.
Win8.1 pro 64bits, recognize as compatible vga adaptor, you must use modded drivers for install, but when you try launch a game, or launch 3dmark, or gpuz, or hwinfo64..... laptop did crashed, or freezy.
My laptop is an Alienware AW17 of december 2013, it cames with 780m, 3d screen(which must remove and install an older 900p screen of a friend when I tryed 980m), 24gb, 4930mx.....
After more than 5 days with reinstall windows, drivers, clean install, never, I repeat, NEVER, didn`t can make this card work in my laptop, in otr forums people try in m17xR4 and AW18 and m18x r2, with the same result, 980m for the momento is no compatible with aour laptops.
Here you could see more detailed info, with videos, photos, configs........
Aw m18x R2 Dual 980m SLI upgrade!! - Page 17
Going to test clevo 980m in alienware m17x R4, m18x R2, AW17 - Page 33
Now I have a not compatible card, I sold my old 880m 1 month ago, and if I try any app or game that should use vga card, laptop freezys, crashes,..... and loose My money too, because Eurocom aka upgradeyourlaptop say the card is working.....