The G15 base is just another cheap bubble dome... I do enjoy the features on it though. I dropped using mine as soon I tried my first mechanical. And also the PS2 connector is unrelated. The guy you replied to was speaking of the mini-usb connector that plugs into the back of the keyboard. The PS/2 connector just gets you N* key rollover (infinite), usb is just 4 or 6 key rollover I believe.
yea i bought the g15 before the whole mechanical line got huge. i played plenty of semi-pro CS 1.6 matches with the old bubble dome keyboard :-P . and yes the ps/2 is unrelated to his issue but it's something people should know about