Sorry to bring you bad news and more of it, but that phenom ii 555 is not a unlocker by far.
Read this thread closely and read what rhe msi users have to say:890fxa-gd70 ACC functionality???
That thing might have acc disabled which will make it nearly impossiblr for it to unlock a good athlon ii x2 x3 or a Phenom II x3, x4 965 version and possible phenom ii x6 1055T and 1090T thuban cores.
Yes amd has made it possible to go to x8 cores but they are very unstable like ****, even my msi amd sli mobo and the old one I sold off 4 weeks ago said that there 2 unknown cores in there.
Your best next time around is look for a msi mobo that states directly it has the acc function, when you do unlock your next amd core bring the speed down to 2.7ghz or 2.9hz or else windows vista and 7 will not like it at all.