The new Core i7 chip seems to use the new D-0 stepping and overclocks pretty well, FUGGER from Xtreme Systems published a screenshot of a Core i7 975 EE engineering sample overclocked to 5259.6MHz while running at a chilly temperature of -50°C.
Together with a pair of Radeon HD 4870 X2 graphics cards and Corsair's new 1866C8 peltier cooled DDR3 memory the overclockers managed to set a new 3DMark05 world record of 47026 3DMarks.