Servers are getting highly power hungry and cooling requirements of servers are inceasing with each passing day. 25% of a data centers cost is only spent in footing energy bills, which is quite a large percentage sometimes going up to 44%. Also real estate costs more in cosmopolitans and any form saving would add to total cost pruned by managers of datacenter.
To reduce the cost of energy consumed now a days the rtend is to go in for multicore servers, dual, quad or eight core servers from sun, IBM , AMd et al are already there in the market catering to the data center demand.
Multicore servers can reduce power requirements upto 66% and can also be used for server virtualisation.