On Aug 18, 2009, at 6:48 AM, Rainer Duffner wrote: > Yaovi Atohoun schrieb: >> Hi all, >> >> I am going to install CENTOS 5..3 on three HP Proliant ML 350G >> servers. The processor is Quad-core Xeon E5420 and E5335 for one of >> them. They all have 1GB Memory. Should I install a 32 bits version or >> 64 bits versions? >> >> The servers will be used an organization about 50 peoples for Web, >> Mail and related services. >> > > > 64bit can still run 32bit programs. > So it's a no-brainer: go 64bit right from the start. > I see the reason for the question. WIth the limited memory, there is less need for a 64 bit version, and 64 bit will use additional memory anyway. So does any of the applications needed benefit from the larger virtual address space?