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Asus m4n75td. Vdroop problems

post #1 of 15
Thread Starter 
Hey guys. Trying to hit 4ghz with my phenom II 560. I think vdroop is preventing me from doing so.

setup

asus m4n75td
phenom 560 on two cores
750W ozc
8gb gskill @ 533mhz 7 7 7-20


for example. I set my core voltage to 1.55V in the bios. When i boot up, cpu z says im at 1.55V until i put load on the system. with prime running large ffts, my voltage drops to 1.53v. It seems to be handling 3.9ghz at 1.53v and i think i could pull 4ghz out of 1.55v but the only way to get 1.55 voltage while under load is to run an even higher voltage for idle.. which i dont want to do.

my temps are peaking around 36C with my fans running full blast. my cpu cooler is from some am2 quad core. its bigger and has more contact area than the stock cooler did. seems to work pretty well.

What sort of settings should i be looking for in the bios to prevent vdroop? I have looked a few times and done a bunch of google searches and came up with nothing. maybe im blind, idk.

any ideas?
post #2 of 15
Load Line Calibration (LLC) should help if it's an option on that mobo.
Here's a little info http://www.overclockers.com/load-line-calibration/
You have to watch the Load Voltages when running LLC, use this to gauge maximum Vcore. If Asus PC Probe reads max Vcore under load the same 1.53v you should be fine to raise it slightly and see what you get for temps and stability when under load it reads 1.55v. Just be sure to run C&Q to manage voltage when not stressing, and closely monitor temps and voltages.

Once stabilized I always run C&Q to do away with high Vcore and also lowers temps at idle for everyday work/play etc. It's works like a dream!

If C&Q is greyed out in the bios it's due to running manual voltages rather than Offset voltage which on a CHIV allows use of C&Q to the 18x CPU multiplier (guessing something similar for your mobo). You might also have better luck raising the Ref Clock rather than just a CPU multiplier OC.
 
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post #3 of 15
Thread Starter 
from what i have read about C&C is that i cant use it if my mult. is higher than 18. chances are i will have it at 19 unless i want to just mess with the fsb and get a lower mult.

my board has about every setting to do with overclocking besides LLC. talk about fail. my old ecs board had llc im pretty sure but it lacked everything else...

the problem with 1.55v is that the next step up is 1.6x (i think its 1.625) wheras the trend before then is 1.4125, 1.425, 1.375, and so on all the way to 1.5. I think asus did that to prevent anyone from going further than 1.55 simply because they shouldnt unless they are intentionally going hard.. which i am not.


right now im stress testing at 3.8ghz. bios setting of 1.4375v and under load it drops to 1.242. not sure how significant that is.. its basically one bump down.

id like to hit 4ghz stable on 1.5V under load.. im fine with 1.55v as ive ran it for a while on 3.9ghz and my temps never hit 50c.


one thing im wondering about is cpu vdda setting. its at 2.6v right now. i dont think this has to do with llc though.. frown.gif
post #4 of 15
That is correct.

You will find a good explanation of voltages here http://www.overclock.net/t/762641/voltages-whats-what-and-what-they-mean
 
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post #5 of 15
Thread Starter 
thanks


do you think its safe to run my cpu/nb voltage at the same voltage as my vcore? right now im at 1.44v under load with the cpu/nb voltage at 1.4.

When i first started, i set vcore to 1.4v and my cpu speed to 3ghz (3.3 is stock!) and tuned the NB clock to 2800mhz. to get it stable, i had to run it at 1.4v.

now that im nearing 3.9 and 4ghz cpu speeds, im thinking i may have to increase the cpu/nb voltage even higher. reason being is i keep reading about people taking this chip all the way to 4ghz and sometimes 4.1 on less than 1.55volts... and i seem to have trouble even getting the thing to stress test at 4ghz on 1.55v and sadly i cant push the voltage higher because the next option up is 1.625 and thats to much for my taste even though my temps never go over 41C.

i read that some people wont push 1.3 volt on their cpu/nb and others say to run it at the same volt as vcore but never go higher than your vcore.



also, not to sound confused. I have HT and NB set to 1.2v



i guess im straying from the main reason behind this post.. i think i could get 4ghz @ 1.55 volts to run stable if i didnt have vdroop but i also think there is something else playing into it due to others being able to run 4.1ghz @ 1.45v (or so i have read.)
post #6 of 15
Maximum safe CPU/NB voltage from AMD is 1.5v same as Vcore. However it shouldn't take all that for the CPU/NB voltage. Make sure to check the Dram voltage AMD platform sometimes requires an additional .05 to .1 v.

When testing with prime95 here's a couple rules I follow to stabilize,
A BSOD is usually a lack of Vcore,
A "Worker has failed" error (rounding error etc) is usually either a lack of Dram voltage, or a lack of CPU/NB voltage.

I have a Phen II x2 555 at 4015NHz (259MHz x 15.5) @ 1.525v and NB Freq @ 2849MHz with 1.35v CPU/NB.
HT voltage is at 1.38v (max voltage on a M4A785-M mobo) due to Dram being OC'd just to give you an idea.
 
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post #7 of 15
Thread Starter 
here are my current clocks and voltages


cpu 19mult (3800mhz)
cvore 1.45 (drops to 1.44)

dram is at 1.65v (i am running it at 666mhz as opposed to 533 that it was at. timing 8 8 8 23

cpu/nb 1.4125v
cpu/nb 2800mhz

mem test ran great so im not worried about the ram being messy with the overclock. I think i might shoot for 1.55v and set it at 4ghz and see what happens.


the only thing i havnt touched is nb and ht voltages. nb is at 1.2 and ht is at 1.2v. That is the min manual setting allowed. ht is at 2000mhz still.


one thing i keep thinking about is fsb overclocking vs. mult only. Is there a reason that going with a lower multiplier and a higher fsb would be more stable than leaving fsb at 200mhz?
post #8 of 15
Using the Ref Clock will create a complete (balanced) system OC which in some ways reduces a little stress off the CPU voltage wise and can allow for a slightly higher OC using less voltage (also less heat). It spreads out the stress sort of speaking to other areas while opening the bandwidth for even greater performance. You can see, and feel, a difference between OC's. Up to you to find that sweet spot for "your" system. It sometimes helps if you benchmark before and after. It's usually a little more work but well worth the effort if you plan to OC. After you get your feet wet with CPU only OCing it's a completely normal thing to progress into something with more of a challenge. All in the name of the pursuit of performance lol.

Here's a real good guide that I always recommend http://www.overclock.net/t/525113/phenom-ii-overclocking-guide
It has a ton of very useful info on the "how too's" along with what order to do things.
 
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post #9 of 15
Thread Starter 
thanks man!

i think ill try and go from 3.8 to 4 by changing just the reference clock. ill give that page a read too


i remember reading somewhere that the highest i can bring the ref clock is 230? i think thats BS but its always good to ask.
post #10 of 15
Take a little time and study each section one at a time. It'll explain what to do and how. Just don't rush, and watch the temps. It's all in the note keeping and testing lol.
Also feel free to PM me if I can ever be of more help.
 
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