I believe that this should be more than enough - although this of course depends on the planned system usage (users, used Baan modules, amount of data etc.). We're running our ERP LN application and the data base (Informix 10) on a server with six processors (Sparc) and the system load is most of the time low. I'd recommend to focus on installing more memory and maybe on installing/upgrading your hard disk system to RAID (using fast hard disks). Have you checked the system load on your current Baan system? This should be the best way to identify "bottlenecks" and knowing them to invest in upgrading.