Intel : problems with 65nm engraving process?

Intel has already sent sample of its new desktop processor, Presler, to motherboard manufacturers. This new processor is a dualcore model using 65nm engraving process.
Motherboard manufacturers have reported many stability issues. So the first Presler samples are not really ready for large scale production.
Thankfully, the Yonah, available early 2006, also produced at 65nm does not seem to have similar stability issue, and should find its way in the first iBook x86.