Just wanted to post a follow-up. I've been running fine since I put the replacement memory in.
About a week ago I followed your guide & OC'd to 3.8Ghz with no problems so far. I plan on trying 4Ghz next, but want to take the time to monitor temps & such when I do that since I am air cooled (with a Hyper212+).
The only things I had to change were:
Bumped my ddr voltage from 1.51 to 1.53.
Bumped CPU voltage from 1.35 to 1.4V.
But I'd already done those when I was trying to diagnose my memory problems. I like my MB+CPU combo, I just wish they'd put half multipliers back in for an F7 update.