I have an Abit AN52V mobo (socket AM2, nForce 520) with the latest BIOS update which claims to support AM2+ CPUs with the 800MHz RAM. The question is whether it would be possible to sometime upgrade to Phebom II X2? Abit's page does not say anything about this issue. Now I have Athlon X2 5000+ @3GHz.
you are right, the HT speed will be reduced and the memory can work at most as a DDR2-800.
Though formally there is a BIOS update which supports the AM2+ (Phenom I's) CPUs, and it is claimed that the AM3's are backwards compatible with AM2+...
Anyway, I think you are right, and even if it works it will not give such a performance boost.
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