haha, I remember saying that this move from mobo manufacturers was a bit strange and extremely interesting(from not good point of view). I even remember making a GIF with AM3 and AM3+ sockets flipping, thus showing that those sockets are not the same.
I myself have MSI 890FXA motherboard which was among one of those quoted to be compatible with BD. Yet flipping socket gif confirmed that it was impossible because you would need to cut out BD cpu pin out or cut the hole in the socket for that extra pin for BD.
I remember there was some rumours or even AMD announcement that they have some problems with 990FX chipsets, so at that time putting AM3+ socket onto 890 chipset based motherboard made sense. But now when it has been, what, 3 months since 990 mobos were released, there is no point in supporting two or 3 identical yet different lines of products.
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