ASA Debuts 4U Fat Twin Server with 4 dual processor hot plug nodes which includes: 8X3.5" hot swap HDDS (total 32), up to 256Gb memory 8 DDR3 DIMM slots per node. 4X1280W redundant Platinum (94% efficiency) power supply. click here to get more informationn and specifications: 4U fat twin server 4 node
4U Fat-Twin Server 8 Dual Processor hot-plug Node. includes 12X2.5" hot swap HDDS, up to 512GB memory 16 DIMM slots per node. 4X1650W redundant platinum level power supply.
click on this link to have a look 4u Fat-Twin Configuration