Quote Originally Posted by VulgarHandle View Post
sAM2 - Supports all chips that have 940pins and use DDR2

sAM2+ - Supports all chips that have 950pins and use DDR2. It also supports split power planes(allows you to set different voltages, 1 setting for the cores, 1 for the IMC), and HT3.0. K10's will utilize these 2 extra features, K8's will not.

s1207 - supports all lga1207 chips

sG - supports all lga1207 chips, as well as the split power planes and HT3.0

http://www.theinquirer.net/default.aspx?article=39445
now, the inq seems to think AM2+ wasn't supposed to have HT3.0 but now will, but I always thought it would

also, they say the new server socket is called "g", instead of s1207+

either way, as has been known for quite some time now, the sockets are both forward and backward compatible. It's also thought that sAM3 chips will work in AM2/+ sockets because the memory controller supports both DDR2 and DDR3, but AM2/+ chips WON'T work in sAM3 since they don't have a DDR3 controller
AM3 seems to be DDR3 only.

Also its extremely unlikely for any AM2+ and AM3 mix. Since AM2+ got parallel VIDs and AM3 serial VIDs. So unless they drop serial VIDs it will basicly be impossible.