Dell PowerEdge R810 Server $4000
2 X Intel Xeon OCTA Core X6550 2.0Ghz
2 Physical 8 Cores Processors installed
Each Processor with 8 Cores , Total 16 Cores
Altogether 16 Cores and 32 Threads 
Support upto 4 Processors
18Mb L3 Smart Cache
6.4Gt QPI Link
Processor Specs :http://ark.intel.com/products/46495/
vmWare ESXi 6.0 Compatible
Citrix XenServer Compatible
Windows Server 2012 R2 Compatible
Support Linux , Ubuntu , CentOS and many other OS
Support Virtualization Technology
VT-x , Hyper V , VT , VTX Compatible
Support vmWare , vSphere , Hypervisor
Support Nested VMs
Support SLAT , EPT Extended Page Tables
Support 32Bit and 64 Bit Operating System​
512Gb RAM
32 X 16Gb DDR3 PC10600 Dimms installed 
2 X 240Gb SSD
2 Physical Hard Drives installed
other Hard Drive options are available
Hard Drive upgrade is also available
6 X Hot Swap 2.5" Hard Drive Bays
all 6 Hard Drive Trays are included
Dell H200 Raid Controller 6Gbps
Support Raid0 , Raid1 and Raid10
Support upto 12Tb Internal Storage 6 X 2tb
Support SAS , SATA and SSD Hard Drives
4 X Gigabit Network Ports 10/100/1000
iDRAC Enterprise Remote Management Controller​
2 X Redundant Dual Power Supplies
Railings not included 
Face Plate is included 
2U Size Rackmount Server
More Specs : http://www.dell.com/downloads/global/products/pedge/pedge_r810_specsheet_en.pdf
Windows Server 2012 R2 Trial Version is installed
we can also install vmWare ESXi 6.0 Trial Version
You can test this server before buying
Fully tested and Functional  off-Leased unit 
1 Year Hardware Replacement  Warranty
=====================
You can Chose one of this HDD option:
2 X 240Gb SSD
OR
3 X 300Gb 10K SAS
OR
3 X 500Gb 7.2K SATA
=====================