OpenBSD/amd64 runs on AMD's Athlon-64 family of processors in 64-bit mode. It also runs on processors made by other manufacturers which have cloned the AMD64 extensions. (Some Intel processors lack support for important PAE NX bit, which means those machines will run without any W^X support -- it is thus safer to run those machines in i386 mode).

Note that OpenBSD/i386 also runs on these processors, but in 32-bit mode.

X Window System support is available for most graphics cards, using the X.Org server. As with other free operating systems it is highly recommended that Nvidia cards are avoided since this vendor continues to show tremendous resistance towards releasing information that would allow X.Org to support their hardware properly.

Table of contents

Current status:

The only major shortcoming at this time is that the kernel debugger ddb is somewhat poor.

Supported hardware:


All versions of the AMD Athlon 64 processors and their clones are supported.

SMP support

Starting with OpenBSD 3.6, OpenBSD/amd64 supports most SMP (Symmetrical MultiProcessor) systems. To support SMP operation, a separate SMP kernel (bsd.mp) is included with the installation file sets.

As this is a new feature, developers will want to see what hardware does and doesn't work when running SMP, so it is even more important to send a dmesg after install.


Bus interfaces

Entropy sources

Floppy controllers

All PCI IDE (pciide) adapters supported by the i386 platform

SCSI Host Adapters

RAID and Cache Controllers

CD-ROM and DVD-ROM Drives

Tape Drives

Display Adapters

Note that not all of the display adapters OpenBSD/amd64 supports can be used under the X Window System.

Serial Ports

Communications Controllers

Ethernet Adapters

Please be aware that many NE2000 adapters fail or perform very poorly. We do not recommend using them, but your mileage may vary.

10Gb Ethernet Adapters

Wireless Ethernet Adapters

Gigabit Ethernet Adapters

Cryptography Accelerators

PC Cards (PCMCIA and CardBus)

WAN adapters

Universal Serial Bus (USB) Devices

Pointing Devices

Sound Devices

The following driver has not been extensively tested:

Radio Receiver Devices (radio)

Miscellaneous Devices

(G) Drivers for hardware marked with (G) are only included in the GENERIC kernels, but are not included in the distribution cd-rom boot image or boot floppy.

(A) Drivers for hardware marked with (A) are not included in the boot floppy, but are included in the cd-rom boot image.

(*) Support for devices marked with (*) is not included on the distribution media or in the GENERIC kernel, and will require you to compile a custom kernel to enable it.

Getting and installing OpenBSD/amd64:

The latest supported OpenBSD/amd64 release is OpenBSD 4.8. Here are the OpenBSD/amd64 4.8 installation instructions .

Snapshots are made available from time to time, in this location as well as in a few mirrors. Here are the OpenBSD/amd64 snapshot installation instructions as well.

There are several installation media provided:

Supported platforms
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