So you consider turbo for the build but not MIRs?
http://ark.intel.com/products/65719/Uhhhh
You JUST stated you did not consider turbo as the rate.
You also didn't calc the IPC increase.
1 year warranty and 30 days return. Price match policy.
Most parts have 3 years normally.
3.4 GHz vs 3.1 Ghz... I did not realize the 3.9 was Turbo, but 3.4 is base frequency. IPC?