From <A HREF="http://www.tyan.com/support/html/cpu_athlon_duron_opteron.html" target="_new">tyan's cpu support page</A>, it would seem you can upgrade your dual athlon setup to up to a dual 1900+ rig. This upgrade will cost you, according to <A HREF="http://www.pricewatch.com/" target="_new">pricewatch</A>, around $150, $75 for each processor.
Unfortunately, the Tiger MP is limited in terms of upgradability, because this is <i>the only one</i> of the Athlon MP mobos from Tyan that doesn't support the whole MP lineup (up to 2800+). (sorry for the bad news)...
<i><font color=red>You never change the existing reality by fighting it. Instead, create a new model that makes the old one obsolete</font color=red> - Buckminster Fuller </i><P ID="edit"><FONT SIZE=-1><EM>Edited by Mephistopheles on 08/10/04 11:53 PM.</EM></FONT></P>