I thought they lociked old threads to prevent resurection of year old threads... Megahertz? oi. I wouldn't upgrade to 8 for a "performance boost". Windows8 is on rleease preview now, but still a lot of hardware doesn't have drivers available yet. Also it's not all that stable either. If you want performance, wait for 2.0 as they're migrating to a new engine that is more optimized.

Megahertz makes minimal difference. A quad core low voltage cpu running at 1.6-1.8ghz can often outperform a first gen quad core @ 3.2ghz. 1ghz = 1000mhz if you were unaware.