Fits socket 7 boards.
An AM2 Socket is a type of socket used by a Processor on a motherboard. These are AMD processors, as indicated by the "AM". When you buy a motherboard and processor you must make sure that they have the same socket and that your motherboard supports the processor you have chosen. For more info: http://en.wikipedia.org/wiki/Socket_AM2
By far, the most used AMD mobile socket is the 638-pin S1 socket.
It depends on the type of AMD processor. The current AM3 generation has 938 pins.
If you have an AMD Duron processor, those run on a Socket A motherboard, which is very outdated in 2011. No major retailers sell processors for such an old socket. I would recommend an upgrade, as Newegg.com has Socket AM3 (the newest AMD processor socket) Sempron processors for as low as $36.99 and AM3 motherboards for as low as $39.99.
Processors don't connect to a motherboard, there are installed in a socket. What determines if a processor is compatible is the type of processor... PGA(AMD most of the time) or LGA(Intel) and the ammount of pins that are on the motherboard/processor.
Currently FCPGA988 is the most popular Intel mobile socket, the most used socket for AMD is the 638-pin S1 socket.
The AMD Athlon originally used Slot A. Later Athlons used Socket A.
The Intel 6th Generation i7 is much better than the AMD Athlon.
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.
Assuming you're talking about the AMD Athlon II X2 250 and the X2 265, yes. They both run on Socket AM3, and are fully interchangeable. Good idea on the upgrade, but for $1 more on Newegg, you can buy the AMD Athlon II X3 440, which is a triple-core processor on the same socket. A dollar more for a whole extra processor? Sounds like a good deal!
Unfortunately, no. AMD uses the Pin Grid Array socket system, where the processor has many pins that fit into holes on the motherboard. Intel, on the other hand, uses what is called the Land Grid Array socket system, where there are many pins on the motherboard's processor socket that connect with contacts on the processor. They're completely reverse systems, and attempting to use one with the other will result in severe, unrepairable damage to both the processor and the motherboard. Please do not attempt to use any Intel processor with a motherboard that uses AMD processors, or vice-versa.
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!