Krow, I've never seen a dual
upgrade card for the Power Tower Pro made by Power Computing - you can get Sonnet G3 & G4 single processor cards (up to 800MHz) at
OWC Power Computing did make a dual processor Power Tower Pro:
http://www.everymac.com/systems/powercc/po...r_pro250mp.htmlI've never even seen one on eBay - not sure how many of them they actually sold, considering that they cost a whopping $6,500!
Daystar/XLR8 also have upgrade cards, and theoretically you could add a dual processor upgrade to their carrier cards, but I don't see any for the Power Tower era clones:
http://www.daystartechnology.com/pages-xlr...8pricelist.htmlThe Sonnet cards look like a better deal to me. XLR8, now that it has been bought out by Daystar (or whatever happened - XLR8 itself, as an independent company, no longer exists) does not seem to have developed anything new since last year. I have no idea what customer support (and all those other good things) are like with Daystar.
Though XLR8 did make dual upgrade cards, I can't find any at the retailers that used to carry their products, and Daystar don't actually list them for sale. Nothing on eBay right now either, except the single processor cards.