Does the ram need to be installed in pairs on a PowerMac G5?

Hi, I recently inherited a dual 2.0 ghz Powermac G5. The computer is in fantastic condition, to be honest it looks new, however, I decided that I want to do some upgrades like the ram, OS and probably add a hard drive. I recently read somewhere that Powermacs need to have ram memories installed in pairs, is this true? I would really like to know before making any purchases to avoid any problems. 

Yes, see http://support.apple.com/kb/HT2248
 Cheers, Tom

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