G1000Pilot wrote on Jun 1^st, 2009 at 11:23am:



OK.. lets back up..  I see where I posted an error for 3.8Ghz because I did a quick copy/paste from an extreme 965 list and forgot to remove/change the non extreme proc memory settings



Here is the deal.. on non-extreme processor with UCLK it will still be set to 2xDRAM Frequency however DRAM FREQUENCY will be directed by BCLOCK which is what I missed with the 940 and 3.8Ghz


At a BCLOCK of 190 your memory should be running 1520 (which is normal) and it would mean the memory multiplier is 8x (8x190 = 1520). When you bump BCLOCK up to 200 that means 8x200 = 1600

so you wont be running the full 1600 memory speed unless

a. You are running the 940 at STOCK speed
b. You are able to run 4GHz (200 BCLOCK) stable

understand?
That is why lower memory timing is very important with i7. Many times a user can not obtain 4Ghz and the lower the memory timing the faster it will be even if its not hitting the full DRAM Frequency of 1600

Sorry.. my bad on that one..

but, now with UCLK, and a memory speed of 1520, you should set UCLK to 2x that value or: 3040

So your correct DRAM Frequency with a 190 BCLOCK is 1520 and the correct UCLK is 3040

You should be able to set those

Confirm the rest of the BIOS, plug in those 2 new values and try again


Leave QPI Link Data Rate on AUTO for now however it can be set to: 3420 as that would be the lowest correct value for QPI @ BCLOCK 190

oh, and one other thing too..

I have seen some variations in Asus BIOS's for the BCLOCK math. It can be 133.33 as a base which will change the outcome of the memory speed on the 8x multiplier. So the deal is set the DRAM Frequency as close to 1600 as you can get without going over and then simply set UCLK Frequency to 2x that value.. it will follow through in the BIOS correctly at that point.

Use the same method for any BCLOCK test.. if you bump it up to 195 then by the 'formula math' the DRAM Frequency will be 1560 (8x195) and the UCLK Frequency will be 3120 (2x DRAM) however wilth the BIOS programmer they may have offset that a touch so use the highest DRAM F value without going over 1600 and then set UCLK to 2x that

understand?

I set the UCLK slightly higher than the DRAM Freq! that was probably it! What do you think?

G1000Pilot wrote on Jun 1^st, 2009 at 2:21pm:



very possible.. and yes, that will do it

here is a i7 calulator that may help...

http://icrontic.com/forum/showthread.php?p=650768

http://icrontic.com/uploads/2008/11/nehalemcalc.zip

it works in MUTILPIERS instead of strait values which can be confusing but it WILL tell you if the DRAM and UCLK is out of sync. It will also give warnings as you input changes and click CALCULATE

to start you off.. input into the calculator

BCLOCK = 190
CPU MULT = 20
QPI MULT = 18 (note what happens if you input 24 instead)
UCLK MULT = 16 (note what happens if you use 12 instead)
MEM MULT = 8 (will always be 8 for you)

you will see the results in the bottom boxes and they will direct your settings in the BIOS

LOL

we have ignition!

When you finally get the highest CPU speed/lowest CPU voltage locked down use CPUz and post the CPU and Memory tabs for me

and remember.. sometimes OCCT may pass but we may still find a bit of instability in the system with FSX running so even though you may have found, in example, 1.35v passed in OCCT for 4GHz it may still be a touch low for high load 3D

your goal right now is to find @ 3.8Ghz the LOWEST CPU Voltage it will run stable and remain under 80c.. which can be anywhere from 1.25-1.35 @ 3.8

once you find that, note it to come back to if needed, then bump BCLOCK up to 200 and reset the DRAM F to 1600 and UNCK to 3200 with a successfull boot your goal is the same.. find the LOWEST CPU Voltage stable @ 4GHz and remain under 80c... which is usually between 1.32 and 1.42

G1000Pilot wrote on Jun 1^st, 2009 at 9:15pm:



OK now remember.. 1.35 may not be needed for 3.8. You may be stable at 1.28 @ 3.8!  Thats your goal, find out how low she will go...


Some of those slugs work like the new D0 procs and run high speed on lower vcore, some wont.. 1.35 may be your stable spot. You wont know that till you try

G1000Pilot wrote on Jun 1^st, 2009 at 9:20pm:



Oh, dont worry, you will know

Do you have speakers on?  OCCT will let you know if it fails  

And if it doesnt boot after making a change in the BIOS or blue-screens on its way into Windows, .. then you know whats up