Google recognizes:
"Data centers need lower latency components"
"In interconnects, today’s typical “processor bus has a lot of overhead accessing I/O and accelerator devices” and is not suited to emerging memory architectures, he said. In addition, optical interfaces such as silicon photonics are needed to link servers in the data center."
Full article here:
http://www.eetimes.com/document.asp?doc_id=1331145&page_number=1