PC GAMESS-related discussion club

Rudy
rcoquet_mailing@fastmail.fm

As a new user of this forum, I would like to thank Dr A. Granovsky and his team for developing and maintaining PC Gamess.

I have some basic questions regarding the OS and CPU I should use with PC Gamess:

1. OS
Of these four OS, which one would be "the best": Windows Vista 64, Windows XP (32 or 64), Red Hat Enterprise WS V4 (64) and Red Hat Enterprise 5 Desktop (64). I am also considering Fedora 7.
I heard the parallel I/O under Windows is not very efficient...

2. CPU
I am considering a single PC with either a Xeon Quad core E5335 or two Xeon Dual core 5130. The E5335 is more or less equivalent to two 5130 put together so I wonder which solution would be the best for PC Gamess: 1CPU with 4 cores (ie. E5335) or 2 CPUs with 2 cores each (5130).

Thanks a lot for your help,
Rudy.