OpenBSD's online hardware information clearly says to avoid nvidia cards. See below.
I have just installed OpenBSD 64 & 32 bit versions on a HP dv6 laptop with a AMD A8 Quad Core CPU and a Radeon Dual Graphics card
and OpenBSd appears very happy with this hardware. I have KDE3 desktop running under 32 bit, have not installed KDE3 under 64 bit yet.
Hope this helps.
===== extract from hardware info section of www.openbsd.org ==========
OpenBSD/amd64
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.
=========== end =============


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Two very different opinions..