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ASUS M4A785-M CPU VCORE unstable

post #1 of 29
Thread Starter 
New member here looking for any help or suggestion for keeping a stable CPU VCORE setting on a this budget build

Windows 7 Pro
ASUS M4A785-M
AMD Phenom II X4 940 Black Edition Deneb O.C. 3.6GHz
Noctua NH-D14 120mm & 140mm SSO CPU Cooler
G.SKILL 4GB (2 x 2GB DDR2 ) O.C. 1066
Silverstone zeus ST75ZF 750 W Power Supply
XFX Radeon HD 5750 1GB GDDR5

Asus Bios, CPUID all conflict overall but my target is 1.475 (1.5 set in bios), however fluctuates from 1.41 to 1.49 under load

Here is some bios images I have tweaked all kinds of settings to try and get stable performance well gaming, or video rendering...current settings windows power management high performance w/ processor min and max at 100%, ACC off, Cool and Quite off, most O.C. settings on auto except for overvoltage for CPU and RAM

vJNfql.jpg
HdbuFl.jpg

Here is screenshoot (as small as i could get it) of
CPUID-notice VCORE (core temp) is where i want it
GPUZ-6 pin PCI-e power required to run card
HW Monitor-shows max temps during CPU load

6oeWO.jpg

Last is a screen shot of VCORE and TEMP on 0# core of CPU from HW Monitor over a 6 hour period during which system was encoding video from VOB to DIVX...big drops in temp are during times between videos

EG8i1.png
wdqBI.png

this last one is most important showing the constant fluctuation in VCORE from 1.41 to 1.49 well BIOS is set to 1.5..so any ASUS/AMD guru's out there with any ideas would help greatly cause I'm stumped..I have read info about loadline calibration but not sure if this will work or not
 
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post #2 of 29
Thread Starter 
http://www.overclock.net/amd-cpus/943109-why-vrms-big-issue-why-choose.html
yeah answering my own post.....mossfet/VRM a issue I have looked at before this system has been running for over 2 years though so?
 
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post #3 of 29
Boards like this are, well, yeah, very well known for vDroop.
That and you are running an unheatsinked 4+1 phase with a 125W+ high voltage 1.475V OC and tower cooler so no VRM cooling. Not that this is necessarily an extreme unsafeness because ASUS boards will protect itself from catastrophic VRM failures, but the voltage drop might not be vDroop and instead be coupled with a clock speed drop for a couple of minutes while VRM temps can recoup.
post #4 of 29
I have built 4 systems with this mobo and have one for my back up rig running a x2 555 BE at 4009MHz with a NB Freq at 2743MHz. Being a mico ATX you should seriously consider adding adding some HS's (Enzotech) to the Mosfets and maybe even a old case fan to blow onto the SB HS as it will get very hot. I mounted an 80mm fan to the back side of the optical drive bay and directed air over the SB and Mosfets (second pic). It makes a nice difference in temps which can only help stability.

As far as your bios I see you have many items on auto that could be changed to help out stability as well.
I could be wrong but 1.5v Vcore for 3.6GHz seems a little high to me.
Manually enter Ram timing specs and voltage for Dram if it's not done already.
CPU/NB Freq - Manually enter 10x for a 2000MHz for now till your ready to OC it.
CPU Over Clock - Manual
PCIE manually enter 100.
VDDNB is your CPU/NB voltage, I'd manually enter 1.2v for a 2000MHz NB Freq. (not auto)
Load Line Calibration change to maybe 50% to start with, not auto. This should help your Vdroop a bit.

You may want to read and study this thread http://www.overclock.net/amd-general/525113-phenom-ii-overclocking-guide.html if you haven't seen it. It'll give you lots of good info, plus give you a good path to follow as you're learning your bios.

These are a few of the settings you can try. When the time comes you want to increase your OC (Ref Clock, NB Freq, Ram etc) or even if you need help stabilizing what you have, feel free to PM me and I'd be happy to share what I know as I have lots of notes from my experience with this mobo!

Good luck and have fun!
 
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post #5 of 29
Thread Starter 
thank you guys!

( XD)vdroop occurs w/ clock multiplier when cool& quite is installed and turned on in BIOS as far as I have found so I got rid of that software but BIOS picture shows it enabled usually is not so I am leaning towards this definitely being vdroop only

(Sandman) yup I found some of your posts last night
VCORE is high i have it set there because this gives as close to the avg of 1.475 under load using current settings
RAM timings are manually entered just not shown in bios pic
Southbridge gets some air from the side 120mm intake fan but could mount another like shown in your pic very nice!


So posted a airflow shot of what I have this is a old picture there is a few more hard drives and I am in serious need of a modular PSU. Will look at MOS C1's for the mosfet's. and still would like to find a slim 80mm fan to install on backside of board, and another 120mm exhaust on top but I may need to drill rivets and remove top to install because of the Noctua

WdEKB.jpg

So I'll do BIOS changes suggested my Sandman and test here in the next few days and put up some more VCORE graphs to see if vdroop improves form manual settings and have fun I will!
 
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post #6 of 29
I just found this thread this afternoon on Vdroop on a M4A785-M http://www.overclock.net/amd-cpus/965150-undervolting-athlonii-llc.html
I'm going to have do more testing myself on this one. Maybe it'll help you as well.
 
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post #7 of 29
Thread Starter 
Interesting Sandman just read over the undervoltage just seems counter intuitive but I get it i think...anyways ran OCCT with current BIOS settings unchanged for 10 min. graph show voltage cutout to processor...going to try your suggested settings and run again and compare...
HW monitor
ANGqy.png
2Me6g.png
OCCT
OMUIU.png
6If54.png
more to come after BIOS changes
 
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post #8 of 29
3.6GHz is the highest you can get with the 940. I know from owning four. Drop the voltage down to 1.45 and test it then. You might have overvolted the CPU and that can cause unstable results just as undervolting can.

I've owned three of that board too. One I had from my second build, sold it, was sad about selling it and bought another, it died, bought another, then sold that computer to a friend, and RMAed the dead one AND THEN got a new one that I should have kept too. frown.gif

Seriously though, 1.45v at 3.6GHz will be stable on that board.
     
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post #9 of 29
Thread Starter 
new BIOS settings per Sandman
YUkXY.jpg
GYPoy.jpg
2DW9p.jpg

Ran OCCT for 10 min again

HW Monitor
QCa14.png
o4rXS.png
OCCT
vqCFQ.png
dOPFB.png

seems to be a improvement not sure where it came from changed many settings at once (sry impatient). In reference to Imglidinhere I changed VCORE to 1.475 from 1.5, but how do you explain Sandman's ability to push his system to 4009MHz with a NB Freq at 2743MHz with a x2 555 BE is this because of the processor difference?
 
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post #10 of 29
Yes. It's because he has the revised stepping, C3, and because the dual cores from the Phenom II line were renowned for hitting 4GHz or higher without a problem.

The 940 is the first Phenom II model ever produced. Therefor it's a C2 stepping chip. The 555 is a C3 stepping chip which would be the reason he can get to 4GHz.

I have the 550, which was the first C2 stepping Phenom II dual core, so my overclock is limited just as heavily. Most 555s can hit 4.4GHz whereas I'm limited to 3.8GHz.
     
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