Definitely, I've ran tons of windows, tabs and had a game open and haven't had any problems at 4.4GHz, I've run over 50 tabs with no trouble.
In fact I did this the other day with ArcheAge, I was pretty impressed that I could leave Firefox and a few other things open and alt-tab out and back in with no worries.
I cant distinguish the difference between it and my Phenom II X4 B55 in mult-tasking, it could also be my 10GB ram helping.
Ah man I miss that chip, I completely wrecked the pins the other day.
4.2-4.4GHz should do if you're not already running something between them.