You can look at the five numbers that make up the Windows Experience Index (WEI), but the detailed numbers are much more illuminating. To measure performance, I looked at the raw data that Windows captures when you run the Windows System Assessment tool (WinSAT.exe). What I found even more interesting was the decrease in performance that you get when you run Windows on Apple hardware. It's at least $300 if you use commercial virtualization software, and possibly much more if you need to pay for additional licenses for Windows apps. That's a bare minimum of $250 on top of the premium cost you pay for Apple's hardware. If you plan to use Boot Camp exclusively, you can skip this line item. VirtualBox is a free option, but when I looked at it a few months ago it was behind the others in terms of Windows support. I've been able to find discounts that take the cost into the sub-$60 range. Virtualization software $0-80 I've been testing VMWare Fusion and Parallels Desktop 6 for Mac.You can find it discounted from legitimate resellers for roughly $250, so let's use that price. OEM copies are allowed only on new physical hardware.) At the Microsoft Store, that shrink-wrapped product costs $300. (Upgrades are only allowed if you are replacing the installed copy of OS X or a previous version of Windows installed in a VM. Windows 7 Professional $250 Under Windows license terms, the only option a normal consumer has for Windows 7 in a VM on a Mac is what's called a Full Packaged Product (FPP) license.