Only one single server box need to be protected against virus attack. Fault tolerance of hard disk failure is possible by using RAID on main server. Server can have 64 bit CPU SMP box having many CPUs or even linux super-computers. CPU power can be shared by many diskless computer users Sharing of central server RAM memory by many diskless computer users. In case Windows 95 PCs, many users need to have individual copy of web browser in local RAM and hence there is wastage of RAM space.
Diskless computers are extremely fast because program loading time is completely eliminated.
For example, if the server loads the StarOffice suite into memory due to request from one diskless user then if another diskless user wants to use the StarOffice suite then loading time is avoided since StarOffice is already loaded. Very few system administrators required to maitain central server unlike Windows 95 PC clients which need many administrators. Zero administration at diskless client side. Diskless computers are absolutely maintainence free and troublefree. Long life of diskless clients - more than 300 years without any hardware or software upgrades.