Low power AMB from IDT
As both Rock and Niagara 2 use FB-DIMMS this are really good news: FB-DIMMs have an addtional circuit called Advanced Memory Buffer. The higher consumption of FB-DIMMS can be credited to this AMB. IDT now annouced a 25 percent more efficient circuit. Okay, thats only between 1 and 2 Watt per DIMM, but you have 16, maybe 32 DIMMs in your server, and thus 16 to 32 AMBs. And from a system view, this really counts.