for sake of future searches, your thread title is misleading... if this is a Q for specific model, please mention is then next time.
there's no "best" IMHO... faster isn't always the stable....
moreover two same cards, same spec, same maufacture but different production date can cause instability.
so, it's best to purchase cards identical as must as possible in any category.
lastly, IMHO, as long as your laptop supports X speed, you'll notice in daily work only improvement from the "size" of ram...
for FPS, you'll want a new laptop ( i.e better GPU and CPU ) - cause O.C ram might give you 1-2 FPS boost, if at all.
Edit by cl-Albert 12/20/17: Title has been updated 🙂 .
Asus G751JTSamsung EVO 850 120GB + 1TB HDD 7200RPM
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