Ask questions about dedicated servers here and we and other users will do our best to answer them. Please also refer to the self-help section for tutorials and answers to the most commonly asked questions.
On Windows, with the multimedia timer enabled, you'll be able to achieve 500fps (on Windows 2003) or 1000fps (on Windows 2008). But, you will also need to use a higher fps_max, such as the one we default to in the server.cfg file we provided.