Asus has issued a few motherboards in the last year for dual processors - notably for the existing Opteron line of CPU's. These are basically workstation boards, but they are extremely stable , nice boards and currently well-priced (that is, cheap). You can look on the Asus web site for descriptions, and Tiger Direct has some in stock, I believe. I've always used duals and currently have a Tyan, as Dale B says. Jinco,com may have some dual boards in stock. My dual 800 board currently is keeping up with most everything. However, the new 64 bit systems will finally, easily out-perform it. And wireless has gotten so inexpensive that it makes economic sense to keep your old system, buy a new single processor system and set up a wireless rendering network across your old and new systems. (Basically, you can do this for the price of the new motherboard, cpu and ram, and another $150 USD. Plus about a half day of tinkering time, of course.) Just make sure you are buying NEW wireless devices with the international encryptation standards built in at the device level. In the second half of this year, a whole new generation of motherboard architecture will start hitting the market. This is called PCI Express, I believe. It will have very, very significant advantages over the old boards in terms of speed and functionality. It will be backward-compatible, so your existing CPUs and PCI devices will work in it. If you can wait this long to upgrade, you should wait and invest in the new technology. For anyone wanting a good set of hardware tech reviews in plain language, or to purchase used and new equipment from tech professionals, try AnadTech.com. People like myself sell off our old equipment to other professionals there when we upgrade. Often, people are selling new stuff they were given as a reward at work, or some other pro gave them as a gift or as a comp. The older hardware still is in excellent working order, or the seller will tell you. Since most of the sellers are techs who know the value of their stuff, they don't give it away too cheaply. But you will find fair prices from mostly reliable people there. The reviews of hardware are usually quite good and without hype.