Considering the purchase of a dual 2.3GHz PowerMac G5. Are either version liquid cooled? I didn't see LCS specifically called out on EveryMac for the 2.3GHz systems (I did for the 2.7GHz system). If the system is liquid cooled I'll probably pass as I already have an LCS cooled system (2.7GHz) and I want to avoid any more.