Hello, I've been using Parallels for a long time now, but only with a WinXP guest for various Windows software where the Mac equivalent isn't suitable. I now want to set up a Linux guest to run a demo version of Oracle eBusiness Suite 12. This can be either a 32-bit or 64-bit installation. I know the Mac will support 64-bit, but not sure whether the Linux guest would be better running as 32-bit or 64-bit. System Spec ... Model Name: MacBook Pro Model Identifier: MacBookPro5,1 Processor Name: Intel Core 2 Duo Processor Speed: 2.8 GHz Number Of Processors: 1 Total Number Of Cores: 2 L2 Cache: 6 MB Memory: 4 GB Bus Speed: 1.07 GHz System Version: Mac OS X 10.5.6 (9G55) Kernel Version: Darwin 9.6.0 Parallels ... Parallels Desktop 4.0 for Mac Build 4.0.3810 (January 23, 2009) The linux version I'm planning on using is ... Specifications Oracle Enterprise Linux 5 (essentially RHEL5 Server Update3) Architectures X86, X86-64 Versions Update 3 RHEL5 Server Update3 | Oracle Enterprise Linux 5 Update 3 # rpm â€“qf /etc/redhat-release | # rpm â€“qf /etc/redhat-release redhat-release-5Server-220.127.116.11 | enterprise-release-5-0.0.17 # cat /etc/redhat-release | # cat /etc/redhat-release Red Hat Enterprise Linux Server | Red Hat Enterprise Linux Server release 5.3 (Tikanga) | release 5.3 (Tikgana) Can anyone please advise or comment on the performance and stability of 64-bit Linux as a guest, and its impact on using the Mac when the VM is active? Thank you, Peter.