Tomshardware took a look at Phenom compatibility and tried to test it on ten AM2 motherboards that were supposed to support it.
The results were disappointing. AMD's new quad core only worked with two Asus boards, while the remaining Biostar, Foxconn, Epox, MSI and Gigabyte boards weren't in a mood to cooperate.
Tomshardware concluded that as an upgrade option, the Phenom is not yet mature, as the vast majority of motherboard manufacturers haven't done much to make it run on "old" AM2 motherboards. Although upgrading your Athlon 64 X2 system with a 165 euro quad core CPU seems like a tempting prospect, it might be wise to wait for the new B3 stepping and motherboard updates.
Check out the full article here.