There is alot of difference, the AMD64 3500 with 130 nano is a newcastle and the AMD64 3500 with 090 nano is a winchester.
Winchesters typically overclock alot better than the newcastles, however.. if you get a winchester that was manufactured before Week 41, it will most likely be a poor overclocker.
The apparent worst weeks are: Week 31/35/37/39 Unfortunately the largest batches ordered were of Weeks 35 and 37, so you are most likely to recieve one of these.
Basically the overclocking world has got upset over the poor overclocking abilities of these processors, people seem to put it down to the Weeks.. as most people who are having the worst overclocks.. are from the same weeks.. However in my opinion, although having a 35 or 37 Week processor may not overclock AS much, it is still possible to overclock significantly, if you do it correctly.
Remember, you will need high quality memory, that is capable of reaching 2.8-2.9VDimm safely, preferably of a speed that is faster than what your processor requires.. ie: AMD64 3500 = DDR400 (PC3200), so get some PC3500-PC4400 (the higher the better). Also people do not seem to take into account that the LDT needs to be lowered.
I will be posting tonight a guide on how to overclock a AMD64 939 system, as I have a Week 35 Winchester (3200+) and i have already overclocked it by 400Mhz, with stock cooler, and 512MB PC3200 memory.. stable :D
I havn't seen anyone with a Week 35 clock higher than myself.. without instability, highest i've seen is 2250Mhz, (3200+ stock runs: 2000Mhz)
