What are the rest of the system specs and what are you planning on using the system for?
so non of the SB i5s have hyper threading?
With the 2400 you get a pretty much guarenteed 3.9Ghz overclock by increasing the turbo multipliers across the chip to x39.
But the 860 has Hyperthreading so i would have just sold the 2400 and put the cash in your savings account!
you can't overclock the 2400...
None of the I5 quads have HT
None of the I5s have HT