Sorry had a slight probelm with the first post.
I got a SL6EF from newegg on a order placed on 2/10/03. So far I have been able to successfully OC to 3.24ghz running my ram at 222mhz. I am afraid to go much higher right now I am using the Retail fan because the Vantec Aeroflow that I ordered was defective(I must have got one with the early TMD fan). Once I get the new fan I am going to try to go higher. From what I heard the SL6EFs are great OC'ers