-Hmm.. maybe those settings don't appear in tools because your BIOS doesn't support it, but they can make a big difference (to perf as well).
This is tRFC in Memset->


Can you see that? Set it to 195ns when you oc HT ref/RAM/IMC.

-I disabled all cores but core 2 (3rd one) and it reached 2.8GHz before it crashed, on just multiplier. Never took any ss because I thought I'd see them in the valids anyway but they're too old to verify. I would try again but if I have to reset BIOS again it won't boot. So waiting for the new BE.

-Yep, the updated CPUZ shows exactly as you're saying. What I meant is, ganged DCT mode is synonymous to single channel and optimized for single threaded performance; in performance, IMC stress, RAM oc'ing and so on, it is like having a single DIMM installed. Unganged is synonymous to best performance typical of dual channel, harder to oc RAM in, much harder on the IMC and also restricts IMC speed oc'ing and HT ref.

I'm still thinking you can get more for some reason.
Have you tried these settings? One of them might work for you.
http://valid.x86-secret.com/show_oc.php?id=279946
http://valid.x86-secret.com/show_oc.php?id=279944

The best setting all round for me was this (stable/benched/ran for 3 weeks):
http://valid.x86-secret.com/show_oc.php?id=278357