IBM x3500 M4 Tower Server 7383C2A

Intel® Xeon® Processor E5-2620 15M Cache, 2.0 GHz, 7.20 GT/s Intel® QPI
Dual socket LGA 2011 supports Intel Xeon processor E5-2600/2600 v2 product family

1 x 8GB DDR3 1333 240-Pin DDR3 ECC UDIMMs (PC3 10666)
24x 240-pin DIMM sockets
Up to 128 GB with 16x 8 GB UDIMMs and two processors.
Up to 384 GB with 24x 16 GB RDIMMs and two processors
Up to 768 GB with 24x 32 GB LRDIMMs and two processors.
Up to 384 GB with 24x 16 GB RDIMMs and two processors.
Up to 64 GB with 16x 4 GB UDIMMs and two processors.

Non HDD
Up to 32 2.5″ hot-swap SAS/SATA HDDs, or up to eight 3.5″ hot-swap SAS/SATA HDDs or up to eight 3.5″ Simple Swap SATA 

ServeRAID M1115 SAS/SATA Controller
6 Gb SAS/SATA: RAID 0, 1, 10 with M1115 or M5110

Up to eight slots with two processors and six slots when one CPU is installed. All slots are PCIe 3.0 slots except Slot 1, which is a Gen 2 slot:
Slot 1: PCIe x8 (x4 wired); full-height, half-length (supports optional PCI-X 64 bit/133 MHz interposer card)
Slot 2: PCIe x8; full-height, half-length
Slot 3: PCIe x8; full-height, full-length
Slot 4: PCIe x8 (x4 wired); full-height, full-length
Slot 5: PCIe x16; full-height, full-length
Slot 6: PCIe x8 (x4 wired); full-height, full-length
Slot 7: PCIe x16; full-height, full-length (requires second processor)
Slot 8: PCIe x16; full-height, full-length (requires second processor)

Two USB 2.0 ports on front. Four USB 2.0, one DB-15 video, one DB-9 serial, one RJ-45 systems management, four RJ-45 GbE network ports on rear. Two internal USB ports (for embedded hypervisor and internal tape drive).

Microsoft Windows Server 2008 R2, 2008 and 2012 (support for 2012 R2 is planned for earlier in 2014), Red Hat Enterprise Linux 5 and 6, SUSE Linux Enterprise Server 10 and 11, VMware ESX 4.1 and ESXi 4.1 (E5-2600 only), and VMware vSphere 5.0 and 5.1.