We have our fog server running on a Celeron machine with 4GB RAM and a WD Caviar Black 7.2k SATA drive. It has a 1GB link to the network and all clients have a 100Mbps link.
We roll out 10 machines at a time, and did an 18GB image on Friday in 15 minutes for 10. So our room of 22 finished in about 40 minutes.
So your spec should be fine.
