Am3
pga
You can use an amd sempron or an amd athlon II with an am3 socket, but when am3 was released it was meant to be used with the amd phenom line of CPUs. You can use all three: amd sempron, amd athlon II & amd phenom.
FM2
Its not needed but recommended for better use.
No, it will definitely not fit. If you have an AM3+ CPU like for example an FX-8150 or an FX-6100, a Phenom X4 or even an AMD Athlon II X2, you have to use an AM3+ socket, or in the case of the Athlon II X2, or X3, or X4, or the Phenom family of CPU's you can use AM3+'s predecessor: the AM3, as well as the AM3+. However, the 939 is a much older socket which is not compatible with most modern day AMD CPU's.
socket 7 or socket A
Some Cpu's that use Socket A are Athlon Xp, Athlon Mp, Athlon Model 4 AMD's Athlons and Duron use Socket A, also known as Socket 462. The AMD Athlon and the AMD Duron use a 426-pin socket called Socket A. The Athlon Thunderbird
Depends - AMD make lots of different processors - What one are you looking at (Athlon, Phenom, Sempron)
939
Use windows xp professional only if you are going to use a pirated one. Otherwise Linux is best
Well, all motherboards are socket motherboards (When we're talking about the personal computer, of course!). The socket and socket type are what determine which processor you can use with your board! Take AM2 / AM3+ for example. Motherboards with the AM2 / AM3+ socket can house processors from the Phenom and FX-X family of AMD processors. It is very important that you make sure the socket type on your motherboard and processor match if you are considering doing an upgrade-- Different socket types aren't compatible!
Yes. You should be able to use an AMD Turion 64 in any Socket 754 motherboard.
I'm sorry, but no. Dell computers in the Dimension line all use Intel processors, which means that you can't install an AMD processor in the socket. They're just not compatible. However, you can use any processor that runs on the LGA 775 socket, such as the Core 2 Duo or Core 2 Quad! Good luck!