A couple of notes: The (AMD Athlon 64x2 5600+ 2.9Ghz) is a Socket AMD2+ CPU.
After I installed the 5600+, and AFTER my MoBo freaked, I did extensive research on the AMD site and BURIED DEEP, I mean DEEEEEEP, in their specs pages was a requirement/recommendation for a (Socket AM2+) MoBo.
I needed Indiana Jones’ help to find this on AMD's site:http://products.amd.com/en-us/RecommendedMBResult.aspx?f1=AMD+Athlon%e2%84%a2+X2&f2=5600%2b&f3=G2&f4=NVIDIA&f5=MCP61&f6=MSI&f7=uATX&f8=65.000&
I was shocked because all of the other specs were perfect for a 4000+ replacement CPU. I’ll try the BIOS upgrade for my MoBo but the most current/last one available for my MoBo is 2008.
The (AMD 64x2 6000+ 3.0Ghz Windsor) runs at (125W) compared to the Brisbane (65W) so I'd have to invest in new fan and perhaps even upgrade my 300W power supply. Which, of course, means that they got me to do the dance.
Perhaps I’m being too stubborn about trying to upgrade on the cheap. But, I had hoped that all the talented and highly experienced users on this site might be able to help me find a workable solution.