Dan3, No, they aren't.
That´s correct. A few months ago, I predicted that SuSE would be a company to watch in the next years. Since then, their Linux distribution has made big progress to become the OS of choice for many important server OEMs. Of course, they are also the primary AMD64 Linux distributor, which would greatly facilitate a potential move to Opteron in the next years, should the OEMs decide to adopt it.