Hard to say, yes there are boards that support it but they can be either cheap, like G41 chipsets which support vastly amount of memory, but Its always to buy double sided ram, which is way more compatible than single sided, because of the nature of that socket and chipsets.
Usually withn QVL list they say DS or SS (Double sided or Single Sided). And also max ram supported, usually with 2 slots up to 8GB's.
Well about that AMD ram only, its not always true, they list it as high density ram Or Single sided/Single rank ram.
I have 1 stick of DDR2 AMD only, single sided and it works well on DDR2 platform, with or without mixing , but I might be lucky.