MSI killer network

Hi everyone, Recently I purchased a MSI GS66 Stealth which comes with the Killer WiFi Network adapter. Performance wise this laptop is a beast but I can't tell the same about the online experience since the network adapter this laptop has (killer wifi) is making the online experience a living...

I have a Dell XPS 8100 with the original motherboard. I'm looking to add USB 3.0 connectivity via a PCIe card. However, the way ports are laid out on the motherboard, my graphics card sits "upside down" so the heatsink/fan would sit right above whatever card is in that PCIe slot. They won't...