As usual, I woke up this morning, got a fresh cup of coffee and checked my mails. Unlike any other morning, I found a link to the Sugar Bay and Bromolow-WS Platform Design Guide whitepaper datasheet. This 452-page document basically covers everything related to the electrical specifications of the Sandy Bridge platform, including platform clock design.
As you can see, the source link will lead you to a Chinese website hosting the datasheet. In my mailbox, I also found a link to download the entire document: http://www.megaupload.com/?d=932R075R