920 D0 @ 3.8Ghz; Help to 4Ghz?

MOBO: GA-EX58-UD3R -- rev. 1.6 -- BIOS FB (latest non-beta BIOS)
CPU: i7 920 D0 @ 3.82Ghz
RAM: OCZ Obsidian 3x2GB 1600Mhz @ 1530Mhz
OS: Windows Vista Home Premium 64bit
CPU COOLER: Scythe Mugen 2 (AS5)

HT: ON
CPU: 20x191 @ 3.82Ghz
MEM: 8x191 @ 1528Mhz
QPI: 36x191 @ 6.876Ghz
UNCORE: 17x191 @ 3.247Ghz

Vcore: 1.25v
QPI/VTT: 1.175v
DRAM: 1.64v

Idle CPU 43c, not lower than 41c // Load CPU 68c, not higher than 70c

Stable through the first four self-tests in Prime95 Small FFTs (roughly 1hr:10min). Stable through plenty of Cinebench runs. Stable through Vantage. Stable through everything I've done for a few days, including Photoshop CS4, COD4, Vantage, Crysis, The Withcer, Mass Effect, and Anno 1404. I consider this STABLE.

I want to know what I should modify to stabilize 4Ghz. If it helps, this is how I got to where I am:

1. I set the volts as listed above. All multipliers as listed above. Set the Base Clock to 140. STABLE.
2. Base Clock to 150. Stable.
3. 160. Stable.
4. 170...180...190...Stable.
5. 200 = BSOD pretty quick into Prime95 (almost instantly). Confirmed multiple times.
6. 195 = BSOD within first Prime95 self-test. Confirmed.
7. 190x21 (via TurboBoost ON, the only time throughout these trials) = BSOD within first Prime95 self-test. Confirmed.
7. Vcore down 1 notch to 1.24375v. TurboBoost OFF (190x20). BSOD within the first Prime95 self-test. Confirmed multiple times.
8. Vcore back up to 1.25v. VTT down 1 notch to 1.55v. BSOD within first Prime95 self-test. Confirmed twice.
9. VTT back up to 1.75v. Vcore still back at 1.25. Base Clock up to 191. STABLE. This is where I'm at now, with specs listed at the top of this post.
10. 4Ghz via 200x20 with various combinations of higher Vcore and VTT. All BSOD during Windows loading or Prime95 or Cinebench. The volts which allowed me to load Windows with 4Ghz seemed to put me at an idle temp of 49c, which I intend to avoid (was always accompanied by a load temp of 76+ which I also intend to avoid).

I assume I've achieved the highest clock that these volts will maintain, and I'm very satisfied with the temps and performance. I wouldn't mind the tiny boost to 4Ghz, and I'm sure I can stabilize it if I just know what to change, so long as the idle temps don't go over 48c, and the load temps don't go over 76c. I plan on increasing the base clock in increments of 1, can you guys suggest which voltage changes should accompany these increases in order to maintain stability?

Thanks

I had to do 1.3v on Vcore to get my D0 to 4.0GHz. I idle around 55C with OCCT. CoreTemp shows 52C on highest core. I always use OCCT though.

Just curious: What was the highest settings that you could run with TurboBoost on?

Why do you need 4ghz? Small e-peen?

I'd try to play with UNCORE setting

UNCORE: 17x191 @ 3.247Ghz seems high with GA-EX58-UD3R mobo.

I've noticed my GA-EX58-UD3R mobos didn't like high UNCORE. So I set so it's below 3GHZ.

lol. i swear that one of these days someone is going to come up with an extreme cpu cooler called 'huge e-peen' or a whole numbered class of coolers: d00d, i just got the "Nerd Factor 9 cooler, it's totally rad!"

ps i have one

I could push my D0 to 3.8 without upping the voltage with the stock fan but the temps werent good so I put it back to normal and then pumped it up to 4ghz stable when my TRUE came in with 1.27 volts and never going above 70c at full load, idle is at 29 to 38 from highest to lowest core on coretemp. Not sure if its worth going to 4.2. Is there a big diff in performance between 4ghz and 4.2?

the h50 isnt suitable for a oc'd 920, your better off with a good aircooler