This is a very neat and interesting article. I think it speaks for itself.

http://club.aopen.com.tw/News/News_showAnswer_Old.asp?RecNo=713&Language=English

Tube-based motherboard...I'd have never thought of that in a million years.

Kind of interesting, but it sounds like it would get pretty hot--You might need one or two of those cards with the refrigerated cooling fans on 'em.

Not something I'd be interested in buying, but a neat article, nonetheless.