well i been thinking of upgrading my processor now i have a dell dimension c521. the processor i have now is a amd athlon 64 proc 3200+ 2.00 ghz, and im thinking about upgrading to http://www.buy.com/prod/amd-athlon-64-x2-5600-brisbane-2-9ghz-2-x-512kb-l2-cache-socketam2-65w/q/loc/111/218192871.html . to this processor here i was told it would work but i will have to down grade bios to a older version for brisbanes to work with the computer. now what im wondering is this true will this processor work and also will i be able to put the side of my case back on with the new processor+fan inside of the computer?