Overclockers Online posted a review on the Corsair TWINX 2048-3500LLPRO memory kit

For overclockers, you are not going to get amazing 1:1 performance with this kit, but 248MHz is still pretty good for an overclock with a CAS of 2.5. This memory did run at a command rate of 1T throughout testing with both my E3 3000+ Venice and in some basic testing with my D0 3000+ Winchester. This is good to know as some have had concerns with the memory controllers being able to run 1T in older processors before the E6 stepping. If you are running the new Asus A8N32-SLI DELUXE, then you are guaranteed these timings and frequency as they are tested on that motherboard before packaging at a command rate of 1T.

Corsair TWINX 2048-3500LLPRO Review