Hi. I have 2 cpu around and one mobo to build a system. http://ark.intel.com/products/27512/Intel-Pentium-D-Processor-820-(2M-Cache-2_80-GHz-800-MHz-FSB) VS http://ark.intel.com/products/27483/Intel-Pentium-4-Processor-651-supporting-HT-Technology-(2M-Cache-3_40-GHz-800-MHz-FSB) 2.8 dual core no hyper threading VS 3.4 single core but with Hyper threading Both have same FSB. Wanna surf the net, play movies and Battlefield 2 multiplayer. I know that game is getting old but I like it! Thx!