From that page, Audio should be fine.. OpenBSD supports the AD1981A AC 97' codec, the rest of the page lacks any *detailed* information about the system.
Digging around leads me to believe it might use a BroadCom chipset for the wired Ethernet.... but that's all I can find.
Unless someone owns that exact system, (possibly a different revision/model), you won't find a definitive answer... the only "absolute" way of knowing if it's supported is to boot OpenBSD and see if everything is detected.
That's my advice..
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