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Insane voltage spikes !! And some NB help ?

post #1 of 14
Thread Starter 
VCore fluctuation : 1.33-> 1.52 0% LLC
Vcore in the BIOS : 1.3875V .. Full load, no breaks. Monitoring during load only.


Folks, I have a PSU that puts out fairly clean power.
It's a year and a half old , but I don't think thats the problem ..

WITHOUT LLC .. My Vcore on my AMD setup jumps insanely.
I have the usual configured..
NO CnQ
FULL LOAD throughout the monitoring.. as in HWMON was turned on/off while the machine was on load.
Screenshot attached!


I have included TurboV to give you and idea of the volts, even though I set everything under the BIOS. AOD is not installed. No other monitoring/ tweaking tool running , and OFC everything is updated AV included :/ if you're wondering.

Another curious problem (NORTHBRIDGE RELATED!), when I OC my NB to 2.8 GHz , despite the volts I gie the cpu-nb, the 2nd core keeps failing , that's at 3.3 GHz :/ How lame ?? Running it at 2.65 right now and not going higher on the HT-REF cause it trips the on-board ethernet NIC. And I so need my RJ-45
I mean, I can actually do 2.6GHz on the NB at LESS than 2.5V CPU-NB , but even 3.1V can't stabilize 2.8GHz ?? Esp. the 2nd core that ALWAYS fails in the 1st 20 seconds.. This being a C3 revision , I'm sure it can do better!
RAM is running at looser timings for the NB testing.
Managed 7-8-8-22-30-1T , Running 8-9-8-24-32-1T @ 1360 MHz 1.62V
Kit rated at 9-9-9-24-32-2T 1.65V@ 1600MHz XMP.
9-9-9-24-32-1T @ 1333MHz 1.5V And I've seen people do this at 1.4V !!

For the help!

EDIT: I should have blurred out the penthouse.. anyway
post #2 of 14
3.1 volts on the cpu-nb ? are you serious ? i am more than surprised anything is still alive.
what ram kit are you running ? asus lists 1 corsair 1600 ram kit as compatible. it's also a 1gx2 stick kit @1.8 volts
how about some cpu-z shots seeing that you *sold* your g-skill ram and have "4x2corsair ram"
your problem could be as simple as "your ram is not on the compatibility list for the ASUS M4A785TD-V EVO " as asus would say.
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post #3 of 14
These voltages spikes are normally the cause of Turbo Core, but your chip doesn't support turbo core, So I'm confused, only thing I can suggest is.... Update your BIOS
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post #4 of 14
Thread Starter 
Thanks for the replies , but we still need to address the voltage spikes on an 8 phase CPU power delivery system to a lowly quad at < 1.4Vcore =/
Quote:
Originally Posted by pc-illiterate View Post
3.1 volts on the cpu-nb ? are you serious ? i am more than surprised anything is still alive.
what ram kit are you running ? asus lists 1 corsair 1600 ram kit as compatible. it's also a 1gx2 stick kit @1.8 volts
how about some cpu-z shots seeing that you *sold* your g-skill ram and have "4x2corsair ram"
your problem could be as simple as "your ram is not on the compatibility list for the ASUS M4A785TD-V EVO " as asus would say.
LOL will work on that.
So I've backed down to one step below 1.25V CPU_NB and it seems to be stable with my 2.65GHz NB :/ Sad (no 2.8 for me ), I'll push a bit higher with the HT REF when I'm at my hostel and not using my onboard NIC..
I'm using a 2x4GB XMS3 By COrsair. IT's rated at 9-9-9-24-32 1T 1333MHz 1.5V
and EMP at 9-9-9-24 2T 1600MHz 1.65V
But my mobo doesn't let me set 2T anywhere . :/ the BIOS IS LAME IS WHAT! I hate it. So am working on tighter timings at 1333MHz .. The whole thing about AMD liking tighter timings may seem true for the athlons , but with the phenoms, since they have plenty of L3 cache.. I don't see the point. Nevertheless.. these crappy chips aren't POSTing at anything tighter than 7-8-8-22-30 1T at 1370MHz 1.62V
Higher volts don't help!
What I DO like about them is their low profile.
I don't expect Asus to keep an updated list of RAM chips that work!! Esp not on a 785G board thats some 3 years old!!
lol
What I do expect of these chips is this : The only reason they're not stable at 1600MHz is due to the lack of a 2T option in the BIOS. So I'm not pushing for higher frequencies.

Quote:
Originally Posted by Atomfix View Post
These voltages spikes are normally the cause of Turbo Core, but your chip doesn't support turbo core, So I'm confused, only thing I can suggest is.... Update your BIOS
My latest BIOS update added some stability , and the previous update brought x6 and probe filter, turbo options..
NO BIOS updates in the past `6` months :/
I'm not happy with these spikes.
What DO I DO :?
Running simple settings.. with all causes of abnormal spikes steered clear of.
I have an 8+2 phase design with a cool NB. And it's not like I'm pushing for >1.4Vcore.. that too on an x4 chip ?
post #5 of 14
Thread Starter 


Have a look and help please!
My mem score is rather low , don't you think ?
post #6 of 14
Please be aware that Deneb CPU's don't have as good IMC as those on the X6 CPU's, so they can't get the Northbridge as high I'm afraid.
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post #7 of 14
thats about right for 1333 cas 7 with an OCced cpu-nb on a deneb i think
13 sec turnaround is good though.
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post #8 of 14
Quote:
Originally Posted by MightyMission View Post
thats about right for 1333 cas 7 with an OCced cpu-nb on a deneb i think
13 sec turnaround is good though.
He's using the old version of MaxxMEM, not the 1.95V, my turnaround time is about 20secs
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post #9 of 14
Thread Starter 
Quote:
Originally Posted by Atomfix View Post
Please be aware that Deneb CPU's don't have as good IMC as those on the X6 CPU's, so they can't get the Northbridge as high I'm afraid.
I've seen 3GHz NB's on denebs , I think stupid is happening here.
ANyway . I'll push for 2.7GHz with the HT ref and post back 2moro , must game right now

Quote:
Originally Posted by MightyMission View Post
thats about right for 1333 cas 7 with an OCced cpu-nb on a deneb i think
13 sec turnaround is good though.
Is it
lol , if u say so , I haven't a friggin clue!

BTW , updating my maxxmem version and uploading , sorry , just read so
Look at this guy : ( slappa )

UPDATED !

Smells like sh**.
Edited by 0razor1 - 8/16/11 at 4:19am
post #10 of 14
You need to add voltage to cpu-nb not your mobo's voltage.
3.1v to your mobo prolly just killed a kitten somewhere.
Considering my mobo's max nb voltage is like 1.4v you just knocked like 10 years off of that board.
Also asus is known for v-droop.
I dont understand it myself but asus supposedly makes the most high quality boards around but they all have decent v-droop.
also if you can get your ram to run around 1600mhz or 1800mhz it will really bring your cpu performance even higher.
And remember cpu-nb is the voltage for your nb. You should be able to set it at 1.35v and get 2600mhz stable.
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