Haha! Robin's right. BD's performance isn't great, decent at best. Until AMD and MS (yes, the OS is a factor) resolve the strange performance issue (BIOS and programs not being able to utilize or detect 8 cores/ 4 modules), I would stay away from BD. If you desperately need an upgrade or performance boost, you can always OC your CPU or get an X4 955 or above.
if you already own a phenom II there is really no point, even if it did work. I wouldnt recommend anyone buy an FX processor, they are just a DUD. I'd rather show AMD, no we dont want your DUD, rather than supporting it. Then they might get the hint and re-hash their phenom II core for better performance instead of wasting their time on this architecture any longer
MSI had announced that only a few (3 or 4 I think) of their 890fx am3 boards would have support for BD with a bios update. Given that even am3+ boards do not work with BD without a bios update, please dont expect your board to.