Dell r720 - Power use

Hi Everyone,

We have two cabinets located in a 3rd party datacentre which are currently contracted for 3.6kW of power each. The current consumption is as follows…
 
CAB1 – 2.2 kW in use (1.4Kw Free)
CAB2 – 2.5 kW in use (1.1Kw Free)
 

We are just about to place an order for the following...

4 x Dell r720 2 RU servers, Dual Hex Core CPU's, 128GB RAM, Dual Single Port FC HBA's, additional quad port ethernet NIC

128GB Memory (8x16GB), 1333MHz, Dual Ranked LV RDIMMs
2 x logic (QLE2560) 8Gbps PCI-E FC HBA - Single Port
DVD ROM, SATA, Internal for Ms 2008 R2
High Output Power Supply, Redundant, 870W
2 x 5M, Multi-Mode, LC-LC, Fibre Cables
2 x 1x Jumper Cord, C13/C14, 250V, 4M
1 x additonal quad port ethernet GB card
iDRAC6 Enterprise
2GB SD Card, for UIPS
Factory Install for VMware vSphere 5
3Yr ProSupport: (7x24) 4-hour Onsite Service

Can you please let me know the power requirements for the 4 Dell servers? Are we going to have power issues?

I have tried to use the datacentre planning tool but the r720 servers are not listed...

Thanks,

Stuart.