Today, I tested a DELL R200 server with two different Hyper-V R2 VMs. Results are unexpectable. Hyper-V R2 beats R200 on performance test. Server configurations:

Dell R200:
OS: Windows Server 2008 R2 (64-bit)
CPU: Intel Xeon X3320 @ 2.50GHz
Ram: 4094 MB RAM
Disk Size: 232 GB, Raid1

Dell M600:
OS: Windows Server 2008 R2 (64-bit)
VM CPU: Intel Xeon L5430 @ 2.66GHz
VM Ram: 4095 MB RAM
VM Disk: 40 GB, Dell EqualLogic

Dell M610:
OS: Windows Server 2008 R2 (64-bit)
VM CPU: Intel Xeon E5530 @ 2.40GHz
VM Ram: 4095 MB RAM
VM Disk: 40 GB, Dell EqualLogic

Results:

So choosing Radore vXeon servers is a smart play for your needs :)