ASUS P7P55D Deluxe Preview @ PC Per
“Though we did not have a motherboard here to do extensive hands-on testing, I did find some interesting overclocking information about the Lynnfield CPU and the ASUS motherboards that I thought I would share. First up is in regards to memory speeds: apparently Lynnfield CPUs that run at 2.8 GHz and 2.93 GHz will be able to run memory at 1600 MHz at stock settings while the 2.66 GHz parts will only be able to push 1333 MHz.”