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Win XP to Win 8.1 upgrade on Atoms

We had a two Intel Atom Windows XP machines running back-office systems which we needed to convert to Win 7 or Win 8. Whilst Win 7 basic will run on these devices you can't buy it and I'd had problems with putting Win 7 'standard' on low spec machines. I'd tried out Win 8 on another low spec machine and it runs very well. True the interface takes a bit of getting used to BUT and its a big BUT once you go to Win 8.1 you  can boot into a desktop automatically and there is a start button (a windows icon where the start button was) of sorts. You can set up all the icons and quick start menus exactly as if it were Win 7 or XP. Microsoft is shortly to rectify this lack of start button  and make it more obvious. So the two PC's were an Asus eeeBox nettop and a Dell A100 Vostro. Running the MS Win 8 checker on both proved positive. The Asus was converted first as a clean build. Absolutely no problems, all drivers and functions came on-line. Everything worked as it should. We needed it to tempoarily replace our Desk Encoder system which takes audio from the desk and serves it over our studio LAN via an Icecast server. We installed it and it ran for 2 weeks  - rock solid. On Monday this week we installed the Dell Atom system running Win 8 replacing this system as it had a larger hard drive. It lasted until Wednesday! Logged in via LogMeIn and it was running at about 100% CPU occupancy. There are only three apps running - BUTT, Icecast and the PlayIt recorder. The forums all recognised the problem (System Interrupts process running at about 40 to 50% CPU ocuppancy) but no definite solutions. A reboot eased the problem but it recurred again the following day. So no chose but to replace the system with the one we had just taken out. The  replacement was now running at about 40 to 50% occupancy including Task Manager and LogMeIn. So the Dell is due to get a good talking to and probably a rebuild. So Win Xp to Win 8 is fine on Atoms in principle but has about a 10% performance hit over XP. As this is a sample of 1 and we were running no bench marks this is a completely non-rigorous and non-scientific result but sort of sounds right.  As we are short of Win 8 licences I may change over the Desk Encoder to a Linux distro as BUTT and Icecast are available running under Linux. The PlayIt recorder is a different matter but I am sure I can find something equivalent.