I've got a hp pavilion zv6000 notebook with an Athlon 3200+ 64 processor. I wanted to upgrade so I did some research and according to the specs, it supposedly shipped with up to an Athlon 4000 64 processor. Most of what I read referreded to the notebook having a mobile athlon proecssor with a socket 754. So I ordered a Athlon64 4000+ mobile. Downloade the service manual, took the machine apart upgraded the ram to 2 gigs while I was at it and realized when I got to the ziff socket that my machine as a Desktop Athlon64 3200+ processor with a socket 939. So, here is my question: How do I find out what the most powerful processor my board will support is? Or, does anyone know what the most powerful processor my board will support? AND if so, will it support a dual core Athlon64 or is that a different architecture motherboard? Any help appreciated.