Quoting mtgoat
I will be replacing my Winnie with a San Diego..

Hopefully I will be too
I am pretty happy with my TCCD, but these weak memory controllers on the winchester CBBID chips drive me nuts. I'm not 100% sure, but I think that the low frequency/tight timing configurations are sometimes better with the winnies, as you can keep the multiplier high, and the memory frequency a below 250MHz. My ram is 100% stable at 300MHz, but I cant get to that with a decent clock.
I hear these Sandiego/venice cores have some pretty solid controllers though. They beefed them up for 4-dimm support @ 200MHz, so 2-dimm stability has also improved.