New
#891
It depends on your North Bridge (NB) memory controller and the RAM sticks.
When you mix brands they will usually go to the recommended settings of the lower spec sticks.
Did you manually set the timings and voltages?
For your system, the Corsair are running at recommended settings and the Kingston are OC'ed.
This is likely the reason for the 7037 Mb/s, which isn't bad for DDR2.