9600BE did 626 5-5-5-15-11 2.15v stable but 9850BE did not do that setting stable even at 2.3v. 9850BE did not run even 560 that setting stable at 2.2v, Memtest failed at Test#6, second run.
In-Windows, I've had more stability than B2 though, benched 638 5-5-5-15-11 2.2v which was not possible before. To check if it is better, I need higher HT and to test 500 4-4-4-4 1T 2.2v. B2 never had this stable but could easily bench it. Still it isn't really stable setting for me, just not crashing yet, Memtest shows it with many errors.
My this set of D9 is good, I can drop to 1.8v real 1066 5-5-5-15-13 and bench it in-windows perfectly fine - but it won't be Memtest stable, it needs 2.05v for that.
1.5v HT voltage is needed? That's a first that I've seen, I have benched 2596MHz HT at stock 1.2v and even 260-274HT at that voltage across quite a few Phenoms

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