I have an Intel Pentium Dual-Core e5200 OC'd @ 3.20 Ghz with 2GB of Ram along with a speedy, yet unsupported (In OS 10.5) Radeon HD 4670. Keep in mind that Windows 7 is Installed on a fast SATA Hard Drive and is freshly installed at that whereas Mac OS 10.5.8 is installed on a slower IDE hard drive pulled from a 2006 eMac! Anywho when booting from the old eMac's hard drive it's fast, OS 10 is responsive and almost instantly I'm connected to Facebook through iChat and Mail is right there giving me access to my new emails. The best part is that it doesn't freeze. When booting Windows, well thats another story. It loads, about 10 minutes later into the OS the startup noise sounds, Applications, such as AIM will load and freeze, i cant click the mouse. The start menu is unresponsive, and there's not even that many startup items. It's amazing. You can fully see why Apple can take such low end specifications, such as the MacBook Air or how about the Mac Mini still running on the Core 2 Duo and claim that they're lightning fast.