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I just upgraded my new desktop which came installed with Windows 7 Home Premium 64 bit with a copy of Windows 7 Ultimate 64 bit and so far I have not noticed any difference in performance. Even my Windows Experience Index number is the same 5.5 that it was before the upgrade.

So what's the point, are there any performance advantages that I'm not seeing?

Additional Info

My system hardware specs:

AMD quad core 2.6 GHZ 1 TB 4200 RPM HDD 8 GB DDR2 RAM ATI Radeon HD 4650 w/ 1GB dedicated video memory

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Where did you hear that there would be a performance difference? –  Sasha Chedygov May 29 '10 at 1:29
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You absolutely don't need Windows 7 Ultimate for home unless you want to change the Windows user interface to display menus, dialogs, etc., in a language other than English. If you wanted RDP, EFS, or XP Mode, you could have gone with Windows 7 Professional instead. –  rob May 29 '10 at 2:21
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2 Answers

There are no performance differences between versions of Windows 7 on the same architecture.

This is a list of features right from Microsoft between the most common versions of Win 7.

The big things that you get in Ultimate that you don't get in Home Premium are RDP, Bitlocker, XP Mode, Boot from VHD, and the ability to join domains. Some of these features are available in Professional and all are available in Enterprise edition as well.

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Windows 7 ultimate is a much bigger OS in terms of size. The only notable differences and language support and bit locker. The bottom line is, unless you really need one of these two features, don't upgrade to ultimate.

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