The i3-540 is OCable. They only started locking down the i3's on Sandy Bridge's (by tying core frequency to other stuff like PCI-E bus). You OC Clarkdale's "old-school" style, ie, the multiplier is locked, but you OC the FSB / BCLK and simply adjust the memory multiplier to match. They were superb OC-ers too. I got 2.93GHz -> 3.9GHz on stock voltage. At that speed they run games like Dishonored, Bioshock Infinite, etc, just fine.I change my vote to i3. I think the features are worth the slight loss in clock, but only if you can overclock the nehalem
If OP has access to one cheaply, he may as well go for that and OC it if he intends to run some other games beyond listed ones. For 1-2T, it's probably same OC'd as a Haswell pentium, but for games with 3-4 threads, the +10-30% boost of Hyper-Threading makes an i3 a great choice.
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