Yesterday I installed openbsd in my athlon single core!
I am glad.
The installation was easier than expected after the tests made in vmware and qemu, which further simplified because I converted a primary partition linux in openbsd (changing the id of the partition).
Remains the problem of how to use the resolution 1280*1024 (now i use the 1024*768).
Note:
I have not tried the audio but i will see later.