I was going through a little anxiety as I was waiting for my 466 to arrive. Based on my past experience with Cellys, I had ordered it with the assumtion that 75 FSB would be a given... Then, I read a review over at SharkeyExtreme, where, back in May, when they first came out, Sharkey could not get the 466 past 66MHZ FSB..
So, your post was encouraging, even as I was just starting to check mine out..
My pack code is also SL3FL.. I ran it for a couple of hours at 466, then bumped it up to 525.. I have had it looping on 3DMark99 MAX for several hours without a glitch, so I am optimistic.
I use the Intel Heatsink/Fan.. It barely gets warm, so I do not think heat is an issue at this speed.. I notice the Intel heatsink for the 466 is somewhat heftier than the 400..
Hurray for AMD.. If Intel had not felt the need to compete in the ~$150 price range, we never would have had, so much for so little..