I'm looking to build a small hobby linux cluster to serve low access websites and host some virtual machines. I was looking at older intel XServe's and Mac Pro's but they either aren't in my budget (need about 4 computers) or don't suit my needs perfectly. I settled on the PowerMac G5 because i can get it in a quad core configuration, the XServe G5 only has a dual configuration. Not to mention that the PowerMac will be much quieter. Considering i need 4 cpu cores per host to pull off what i want to do, the PowerMac G5 seems like the most affordable option. If i read correctly, that Quad model has the newer / better Panasonic water cooling module, correct? I know this is a PPC mac and i know i can't virtualize x86 software. I plan on virtualizing PPC linux and maybe OS X in KVM, which it natively supports on the 970 PPC processors.