980m is super fragile as it gets really hot, plus power rail is underrated (not enough MOSFET for a 100W TDP+ card) so usually the card dies quite quickly.
1060s are much better (run cooler, faster, gen 10...). MSI 1060 mxm can be grabbed for "cheap" on aliexpress (~150e), they are much better than the gecube version. Gecube will also do fine as long as you don't mess with TDP.
Zotac mxm version should be avoided as they miss a temperature resistor so fan will either not work (alienware, dell, HP) or run at 100% (msi, clevo). On alienware you can force fan with hwinfo64 so it's still ok.