Just bought myself an XBox360. First picked one up From JBHiFi for $495 (Pro +2 Free games, Forza2 & Viva Pinata) it was Build 0638 marked 203W Power supply, which potentially could have been a Falcom Motherboard (These are the ones with the 65nm CPU and are said to run cooler/quieter etc). Anyway was suspicious of the package as the game sticker was all crinkly and sticky tape was everywhere. Decided to return it unopened as I suspect it was a repackaged older unit. Saw BigW offering the package at $498 and was pleased to see they were 0742 builds dated 23/10/2007. The sticker said 203W power supply but on opening it I found a 175W power supply and this proves it is a Falcon
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So far it's been brilliant. I can hear it when on but it's no louder than my Media Center PC, the DVD drive also seems quiet with no obtrusive noises. It connected easily to my MCE box and the picture to my 76cm Panasonic CRT HDTV (The one that cannot use a 60Hz signal!!) is waaay better than using the component out on the MCE box. TV looks great as do DVD's. So far I'm pleased as punch, just want to setup transcode 360 so I can watch my divx files.