[citation][nom]jtt283[/nom]The validity of this is somewhat enlightening (and is hideous for AMD), however two points need to be made (one of which already was).1. Additional background tasks will bog down a dual core CPU more than a X3 or quad. Most people do have other applications running while they are playing games; and playing games is not the only thing most computer users do on their systems. Unless it's an absolutely rock-bottom budget build, I would never put a dual-core CPU into a new build, particularly one that lacks hyper-threading. I3 maybe, but Pentiums are not on my radar.2. Until you get up into the "K" processors, Intel CPUs no longer overclock anywhere near as well as similarly priced AMD CPUs; that will easily make up a 10%+ performance deficit (although it does use more power, which I'm not suggesting is always the best use of resources).The more I think about it, the more miffed I become at what a sucking fail Bulldozer is, as I had anticipated it would be a decent upgrade. Still, I can be in the midst of a game on a Sunday night when my Acronis backup kicks off, and not even notice until I see its little icon when the game ends; the 970BE I'm running now seems to be enough for my needs.[/citation]
Background tasks like running an email client or a web browser or an AV client with active protection won't make any of them slower by a tangible amount, like doing something like running a virus scan would. Also remember that even if we were to test having non real-world applications running in the background it wouldn't change the overall picture, either, because Sandy Bridge has 40% higher IPC than K10.5.
Your statement about never using a dual-core on a system is nonsensical, especially when you consider the fact you're comparing two strong, fast cores (Celeron/Pentium) vs. three slow, sluggish ones (Athlon II X3). Sorry, but that's the truth.
As far as overclocking goes you have to remember that the Athlon II X2 and X3 consume tons more power than the Celeron and Pentium, respectively. If you want to overclock you may want a third-party heatsink to keep temps down. Also, the K10.5 Athlons don't have much OCing headroom. Most go to 3.5-3.7GHz only.