We have an IBM server running Windows 2008 R2 Enterprise
It is a Hyper-V server for two virtual machines.
The virtual machines use ports on an Intel network card. We have not noticed any performance issues on the virtual machines.
The host machine has become very slow twice in the last three months. The response time has become slow and Backup Exec is unable to perform any remote agent backups until the system is rebooted.
The host server is using the on-board Broadcom network ports.