I don't have that mobo, but with my 9550, you'll need about 1.3 VTT (fsb) at least to go past 3.2 or so. Over 3.6, you'll need higher, probably close to 1.4. My 780i only lets you go from 1.3-1.4, no steps in between.
You shouldent need that high a VTT for 400Mhz FSB... Though again dependant on the chip.
I did update the bios, so it is possible it is just OCCT that is causing the problem?
Thanks for all your advice.
The new version of OCCT has been a bit flaky of late, drop back to 2.xx builds as they are solid as a rock.
If your pushing alot of FSB, or more than 2DIMMS of ram you will need to up the vNB a bunch, also its usually a good idea to bump it a bit when OCing a quad as they are hard on the NB's.
Try diffrent VTT (vFSB) settings untill you get a good one, for example my 9450 on a P45 will run 1.26 (or 1.24 i cant remember what its set to) to run 475FSB @ 3.8Ghz for 500FSB to post to windows it needed 1.4VTT (ONLY change.)
Also set the PCI-E freq to 101-105 somewere in there, as it removes alot of weird stability issues. The P45 seems to like 101Mhz, were the striker 2 liked 103Mhz.
Also you need to adjust the GTL refs when you manipulate the VTT, when the overclock is mostly stable start tweeking those and you can dial it right in, also get 1-3% more optomisation out of it with IBT. Also when you are going for big clocks on the quads the GTLs play a HUGE part. I suggest 3-5 days of googleing and reading about GTLs then you should have a fair understanding on them and a good place to start tweeking them.
Also i would change the way your overclocking... since it seems you just picked a number and went for it.
I would test the max FSB, then the max core clock, then the max ram speed and pick something thats a nice happy medium.... drop the multy to lowest (6) drop the ram to lowest and start crankin the FSB, you will top out in the 430-470 range on that quad and that motherboard (about the average) if you get more thats great and you have a good setup, if not oh well. once you find the max fsb the chip/board can do, then you bring the multiplyer up at the stable FSB untill you figure out what the core will do, for this i would set the max core voltage your willing to use IE. 1.375 in bios and see how far you can bring the multiplyer up before it wont post, then back the FSB down a bit untill you figure out the stable core speed (probobly in the 3.6-3.8Ghz range, though it might be a bit higher since you have that extra .5 multy). Then drop the multy and work on the ram, since you already know the max cpu/mobo fsb that will give you a good starting point for the ram. then once you have dicked with that for a wile pick somewere in the middle that you would like to run 24/7, leave the voltages and stress it with OCCT. If it passes 10 hours start bringing the voltages down 1 at a time... start with vcore drop it one notch and test again, if it passes, down one more notch. etc etc... if it crashes put it back up and test again if it passes you just found the lowest vcore. then do the same for the vNB, and vDIMM. then once all thats stable tweek the GTL refs and you will probobly be able to drop the Vcore another notch or two after dialing them in.
Whew, sorry for the lack of punctuation in that... I'm just way to lazy to go back and fix it.
**PS**
if it turns out you have a memory hole, PM me as there are some work around for them
