I know intel had made quite a few Katmai Engineering Samples. I had 2 600's & 4 533's, that would OC to hell and back. These are the same design, but what people need to know, is that the CORE is going to be the same from a 233-333 & 350-600. They'll all have 512k, and anything in the 100mhz, should do 600 w/o problem, and anything in the 233-333 [I'm not sure if the design is different from the 66 - 100mhz] should do upwards the same, with the right multiplier settings.
If you posted FULL #'s I could tell ya. Or PM me.