You can overclock an old Core 2 higher than that, with a bit of luck and good gear. And it'll undoubtedly be cheaper than buying an IBM 'frame.
FWIW overclocking records are currently above 8GHz on Vishera using N2 cooling. Granted N2 cooling can't actually be used, but that gives you the limits of the chips. You can reach 5.5GHz on water, and 6+ on cascade or single stage (which do work as standard cooling solutions)
You can overclock an old Core 2 higher than that, with a bit of luck and good gear. And it'll undoubtedly be cheaper than buying an IBM 'frame.
FWIW overclocking records are currently above 8GHz on Vishera using N2 cooling. Granted N2 cooling can't actually be used, but that gives you the limits of the chips. You can reach 5.5GHz on water, and 6+ on cascade or single stage (which do work as standard cooling solutions)