TECHGAGE has a review of Corsair’s TWINX2048-3500LLPRO, with stock timings of 2-3-2-6-1T.  The overclocking test proved that while you cannot hold the CAS of 2, you can certainly get a great deal more bus speed out of them.
“We have just posted a new review of the Corsair TWINX2048-3500LLPRO modules, which are the worlds first 2GB kit to have a CAS latency of 2 at these speeds. Even though they chose to use odd chips in these modules, the performance was still superb, and even beat out the OCZ PC4000 2GB Kit in our gaming benchmarks.”

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