I agree that it's strange the dongle isn't working and suspect it could be faulty. So trying it on something else will tell for sure.
There should be no issue with a dongle according to the spec of the MB , not even on W7. Can anyone just link to an internal card that will work please? here is my original post with suggestions but no-one can guarantee that a card will just "work" as you have found. It also explains why your choice of internal 5GhzPCI cards is very limited. Heres the inside of it if it helps thanks. The picture only confirms what you told us - you have no free PCI-e slots only PCI slots, so you are stuck with either getting a legacy 2.4Ghz PCI card similar to what you have or getting a USB wifi dongle, my Amazon link for this suggested is still valid.
Asus 90IG02T1-BM0000 AC1300 Wireless Dual Band USB Adapter
Avoid the very small USB nano dongles - their pickup range is less good than standard dongles on leads or those with separate aerials
I would still be tempted to check the new 5Ghz dongle you have already bought and try get it working or find out if it is faulty. If possible try and getting working on a different computer and check the range before you go out and buy anything else. Also how far is the router from your computer? as mentioned before the 5Ghz range easily reduced by concrete, floors, walls, doors etc. Your range problem may easily be that you are at the limits of a 5Ghz range Yes I recall seeing, on the spec posted above, both PCI-E slots are utilised and therefore the only real choice, as @DavidG1 also suggests, is to use a dual band USB dongle. Don't understand why the NetgearA6100 wouldn't work as it is W7 compatible so no issue there, and you have USB 2.0 ports on your MB are also right for that product.
On your logitech kaeyboard & Mouse issue, having read a few things, it is not a common complaint, but is a known issue as the logitech operates in the same frequency range (2.4Ghz) as the WiFi dongle.
Not my suggestion but a recommendation to move the Logitech receiver to a different port, front or back of machine, if available, so that the two devices are not in adjacent ports.
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