Should run ok, if not at the very highest settings.
It's great, though not a noticeable difference in games. I picked it up because there was a pretty great sale in the Fall, which let me upgrade from a previous Athlon dual-core system for a ridiculously cheap price after I sold the old parts.
I do some video transcoding, and have been playing around with some 3D on the machine as well, and it definitely tears through that stuff. I'll be glad to have it when some games like Alan Wake start coming around later on.
You probably made a good choice getting a dual core for the time being - you can always swap it out later.