OpenBSD 5.1 amd64 CD can be used with 64bit PC only. OpenBSD 5.1 is a BSD operating system with a focus on security. New things in this release are as follows: umsm(4) supports additional mobile broadband devices; non-GigE ale(4) devices can now establish link to a GigE link partner; support for Intel 82580 has been added to em(4); support for MegaRAID 9240 has been added to mfi(4); support for Nuvoton NCT6776F has been added to lm(4)... Highlights: OpenSSH 6.0, GNOME 3.2.1, KDE 3.5.10, Xfce 4.8.3, MySQL 5.1.60, PostgreSQL 9.1.2, Postfix 2.8.8, Mozilla Firefox 3.5.19, 3.6.25 and 9.0.1, LibreOffice 3.4.5.2... The system includes the following major components from outside suppliers: Xenocara (based on X.Org 7.6 with X.Org Server 1.11.4, FreeType 2.4.8, Mesa 7.10.3; GCC 4.2.1; Perl 5.12.2 etc...

About OpenBSD

The OpenBSD project produces a FREE, multi-platform 4.4BSD-based UNIX-like operating system. Our efforts emphasize portability, standardization, correctness, proactive security and integrated cryptography. OpenBSD supports binary emulation of most programs from SVR4 (Solaris), FreeBSD, Linux, BSD/OS, SunOS and HP-UX. OpenBSD is freely available from our FTP sites, and also available in an inexpensive 3-CD set.