Great, thanks!
One more question: Are there any best practices to avoid a miner from stopping to work. For example last night the task seems to just have stopped, as it shows in red on deepbit and no mhash average or shares submitted, I did not yet get to check in the server room what it says on the screen, but was just wondering if this is a common issue?
If you overclock too high you may get stability issues. Some people recommend flashing the cards' BIOS to underclock the memory and running a distribution of Linux such as Ubuntu Server or Linuxcoin to increase stability. Generally, the more extra bloat you have running, such as desktop window managers, task schedulers and all that crap you get with Windows, the less stable the system.
I'd like to stress that this is my personal opinion, some people claim that Windows can deliver an excellent platform for mining.