Quote Originally Posted by woffen View Post
To be stable at 4 GHz or above I had to increase these voltages:

IOH/ICH 1.1V Voltage: 1.27v
IOH Analog Voltage: 1.25v
ICH 1.5 Voltage: 1.7v

Caught them in this thread http://www.xtremesystems.org/forums/...d.php?t=214381. They seemed to do the difference in stability. 20 x 200 seems impossible for me though. Using 21 x 192 atm. I have a vcore of 1.45 and VTT of 1.4.

For a 200 bclk I need VTT of 1.5 or above to post, this feels like a little too much for 24/7 use..
My sounds enters a loop at Vista Startup (Orb). If i put it at 20x200.
I have 1.4 Vcore, 1.44 VTT 1.65 Dram.


Quote Originally Posted by Krautmaster View Post
thanks a lot. Of course I tried 191x21, without improvements. Today i try to find max bclk.

What is VTT Voltage for? Tested the latest beta yesterday too. I will max out this CPU, but i think i'll get a new one within 14 days. Is it possible that the board is causing these instabilities?

Can i fix multi to 21, the turbo multi. When there is only one core active, i've got multi 22, which may result in bluesceen.
I need to find max block too. I'm kind lazy when it comes to OC.

Quote Originally Posted by Krautmaster View Post
damn, got my 3837B395 yesterday. Tryed about 7 hours to push it to 4 Ghz.
No Chance to get 20x200 stable with 1,45 V +

Settings are:

Turbo OFF / HT ON
20x200 BCLK = 4000Mhz @ 1,45V +
VDROP CONTROL disabled
RAM BCLK*8 = 1600 8-8-8-24 @ 1,665 V DDR Bus Voltage (Corsair Dominator)
VTT = 1,25V
Uncore BCLK*16 = 3200 Mhz
QPI 4,800 GT/s

If I start prime 95 stress test, system runs for about 10-30 seconds, then freeze. I never got a prime error, system feezes always! Normal?

I tested VTT 1,21 to 1,61V, didn't help.

Any ideas? BIOS is the latest nonbeta.

Thanks 4 help.

BTW: Cooled by EK Supreme ca 70-75°C @ 1,45V
O'm hoping that doesn't happen to me too.

Quote Originally Posted by jcool View Post
It's not about the board really, you have to find a 920 that a) likes the 21x mult (only 3 of the 5 I tested like it) and b) one that is a good clocker. Unfortunately even good CPUs may not like certain mults, so it's possible you can run 200x19 at 1,2V but 200x21 remains impossible even at 1,5V
That's the real advantage of the 940 and up, you can pick the CPus favourite mult which makes a huge difference.
Yeah i've been reading about that too guess i'll have to start from the bottom, instead of cranking volts and praying it works.