Who is the moderator of the Sager section??? There were TWO whole threads about this and they kind of disappeared... Hopeful this will stay here.
My experience (third time I write this... frustrating...) with the wireless card in the 5720 is the following:
If you take it out and put in a 8790 it works perfectly OK with intel drivers, regardless of installing INTEL software to replace windows zero configuration service.
If you get another intel card and put on it, it still doesn't work very well. I know some people got the Atheros card working ok, but as I said, this is MY experience with the card.
Based on that, I conclude that either
1. There is an issue between the INTEL cards and the mobo, probably related to power management
2. there is something wrong with how the antenna is wired in the computer.
I managed to get the TV-antenna cable connected to the card, but didn't have a chance to try to connect an external wireless antenna to see if the signal improves. If it does, then my theory that the internal antenna is the problem becomes even more likely.