You can order a one-time setup Xen virtualization with the installation of up to 7 virtual servers for free.
All dedicated servers can have any configuration.

And they have an operating system installed
Operation System: 32/64 Bit Linux – CentOS, Debian, Ubuntu, Fedora. (root access to ssh) – free.
Windows Server 2008 R2 Web Edition (64bit) 10 usd at month.
Windows Server 2008 R2 Standard Edition (64bit) 20 usd at month.
Windows Server 2008 R2 Enterprise Edition (64bit) 50 usd at month.
Windows Server 2008 R2 Datacenter Edition (64bit) 75 usd at month.
Windows 2012 R2 Standard 20 usd at month.
Windows 2012 R2 Datacenter 150 usd at month.

Example: Ordering installation vps/vds for Dedicated Servers – Intel® Xeon E5-2620, you get 7 virtual servers, with configuration:
(cpu 4) Xeon E5-2620
RAM 4Gb
HDD 200 GB
4 ipv4