Yes and it will swing wildly from 100-300 ms like what I saw on mine. You will also suffer packets loss with wireless so you are better limiting yourself to internet browsing and files downloading. Get wired for gaming, especially if the low pings is very important.
Wireless is going to give you a hair more CPU over head. Also it only takes a little interference to cause a latency spike. Some one turning on an electronic device in your house can be enough to spike your latency. For my house, a cell phone ringing next to my laptop causes my wireless to wig out for a second. A wired connection is the only way to go for a gaming rig.