Don't worry about the stepping, it will drive you crazy if you think about it too hard. What you should be interested in is what processors work with a particular motherboard. Usually, if it is a recent board, all you have to do is match sockets like AM2/AM2+. However, some motherboards don't always accept all processors within a socket so it is a good idea to go to the mobo vendors website to check which are supported. BTW, where are you getting that Brisbane processor? Newegg has deactivated it. They still do have a AMD Athlon 64 X2 6400+ though.
Thanks Louis and DJBpace07 for the reply. I got the CPU from Newegg for less than $50. There are plenty of this CPU model around at a higher price. Searching the web all day today I found is that they discontinued the Windsor which drew 89 watts.
The Brisbane is the exact same architecture and draws 65 watts. I also read today that the Brisbane is not as efficient as the old Windsor and there is talk of resurrecting the 89 watt Windsor model.
My motherboard should be delivered in several days and I have to provide the bios number when I contact Gigabyte regarding the Brisbane rev G2 versus the discontinued Windsor with the F3 step for their motherboard that I am using.
I am starting to also feel that the Brisbane should work for me as I am not into gaming at all. I will be using a new 24 pin 400 watt power supply and a Seagate SATA 250 Gig single hard drive plus a CD Rom and a DVD burner as there is only room for two IDE add-ons and 4 gig of Kingston DDR2-800 memory. The Ga-ma78gm-s2hp motherboard rear panel has HDMI, DVI, VGA, plenty of USB ports, optical out and 7.1 audio plus the usual standards.
Thanks again, guys