Basic Environment
Intel Core i7 processor
32GB memory
512GB SSD + 2TB storage
For example：
Dell OptiPlex 7050 Intel® Core i7 7700 32GB (2x16GB) DDR4-2400 512GB Solid State Drive SATA hard drive 2TB SATA hard drive (7200RPM)
VMware For OpenStack Requirement
3 * Controller
1 CPU (2 Core) 4GB RAM 100 GB Storage 4 NIC(NAT + NAT + HostOnly + HostOnly) Virtualize Intel VT-x/EPT or AMD-V/RVI 
2 * Compute
1 CPU (2 Core) 4GB RAM 100 GB Storage 2 NIC(NAT + HostOnly) Virtualize Intel VT-x/EPT or AMD-V/RVI 