A:AnswerIts compatible with PCIe 3.0. It only has 4 lanes so you will get a performance hit when gaming if you use PCIe 3 vs 4. Overpriced card but for daily use and light gaming works good.
A:Answer550 is fine leaves room for the upgrade later
Hoenestly this card isnt worth it its a laptop card that only works well when you have internal graphics and pcie4.0
A:Answerthis card uses under 100w it is a straight port form a laptop gpu its even still missing the video encoders it should have due to laptops all having igpus as well as regular ones.