Whats better: Power Line Adapter or A wireless card

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The main issue with a PCI card is you do not want to be blocking your antenna. The antenna are very close to the metal case so signal is easily blocked from some directions. If your antenna have a clear view of the router will not see much difference between the various brands of cards. You want on that matches the features on your router. It does little good to buy 802.11ac if your router does not also support it.

One high end PCI card that solves the antenna blocking is something like asus PCE-ac66. This has a special antenna array that sits on top of the machine. This happens to be a 802.11ac card they make versions that only do 802.11n. These type of cards with antenna like this tend to be the most expensive you will...
This really depends on your setup and your house. Usually a wired connection is better than a wireless connection (CAT5 ethernet, MOCA, Powerline, etc). Now out of all the wired solutions powerline is the least stable as it has to deal with lots of interference on the power wires. Wireless is also unstable as it also has interference problems, especially in the 2.4Ghz band. If those are your only 2 options I would try purchasing a powerline adapter from a place where you could return it if it did not work. Get an AV2 powerline adapter set. It has the best chance or working. If it does not work then you will have to go with wireless.
 

The_Freeman

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If I were to get a wireless card what would you recommend?
 
The main issue with a PCI card is you do not want to be blocking your antenna. The antenna are very close to the metal case so signal is easily blocked from some directions. If your antenna have a clear view of the router will not see much difference between the various brands of cards. You want on that matches the features on your router. It does little good to buy 802.11ac if your router does not also support it.

One high end PCI card that solves the antenna blocking is something like asus PCE-ac66. This has a special antenna array that sits on top of the machine. This happens to be a 802.11ac card they make versions that only do 802.11n. These type of cards with antenna like this tend to be the most expensive you will find. If cost is a issue and you have signal blocking issue USB may be a better option since you can use a $3 usb extension cord to get it away from the computer case.
 
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