Not sure, this subject may have been addressed previously. I know I would find it helpful to know what different brands of server mobo's weighed. I'll start by saying that all Dell server motherboards that I've come in contact with weigh between 2.5 and 3 pounds. That weight will cover anything from the PE 1750 to 2950. Where as, HP server mobo's(DL180, etc) weigh in a bit lighter at 2 to 2.2 pounds. Anybody got an accurate weight on Sun and/or IBM motherboards?