Question Slow unstable wifi connection after installing network card into hp prebuilt

Krypton10

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Oct 27, 2015
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Hi there. I bought an HP ProDesk 400 G6-Microtower-PC running windows 10 and wanted to install wireless capabilities. I bought a 2.4/5 ghz wireless card (TP-Link Arhcer T4E) and installed it in one of the free pci-e slots. Now i do have an internet connection but it is terribly slow (<8 mbits in speedtest) and the 5ghz connection always drops out. Other devices in the same physical location get about 100 mbits in 5 ghz mode. I already updated all drivers, deinstalled avg antivirus, reset the network adapters, reinstalled the card itself to another slot, tried a different wireless card, reset the router, disallowed the computer to stop the card for power saving... Basically any solution that google threw at me I tested. What could cause such a behaviour? Any other device works well in the network, just that one computer acts up.
Any help is greatly appreciated
 

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