this vdroop problem affect stability issue or not? since >0.05v different consider much for todays cpu

sometimes its does makes the difference between stable at 1.45v and 1.4v u know

i'm on AMD.. since this most happens on intel user..
theorically.. it's should does affect the stability.. but just need to know from intel user's experince itself..
any obvious affect? lag or something?

lagging is more on the performance...this vdroop might effect the stability...running fine and all the sudden, something crashing here and there

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Added on August 15, 2007, 2:06 pmyup, the same i.e. got the vdrop but not as much as the gengstapo one...heheh...
actually has been poisoning him to switch to p35 but he said retired...it's like retired people but went to the office everyday...seems funny la...

@geng, jk only

This post has been edited by remysix: Aug 15 2007, 02:06 PM

Thx for the explanation.

Regarding the vdrop, does all mobo have the vdrop? Will any mobo actually have a higher voltage?

For example, if we set 1.45v for vcore in BIOS, can we safely assume that the mobo will be running at a slightly lower vcore (due to the vdrop) and will NOT be running any higher than 1.45v.....

Le, mine is a P35-DS3 la, which I consider to be a cheap "performance" mobo (can get for rm400!).
Actual setting in BIOS for vcore : 1.425v

CPU-z at idle : 1.392v
CPUz at load : 1.360v

Easytuner5 at idle : 1.41v
Easytuner5 at load : 1.38v

So, unless you have an "expensive" high performance mobo, I guess you'll just have to live with it.....

hey guys. ALL mobos will ahve vdrop and droop. just how much only yes higher perf board usually have less droop so.. yea have to live with it

amd also will have

yea only effect is stability

@8tvt, since not much talking about AMD oc lately dunno if vdroop does have particular issue.

i look on cpu-z.. during load the voltage is same as set in the bios..
sometimes even higher on idle.. it's never below what i set in the bios..
the different also not much.. around 0.02v..
i never experince system prob..
but only sometimes when playing certain games lag for least then 1sec.. i suspected that's gpu related..

well, used to with AMD Athlon64 3000+ Venice E6, BIOS set at "Auto" with software reading (CPUz) at 1.376vCORE, when switched to AMD Athlon FX-60 Toledo, BIOS also set at "Auto" and on CPUz, it's 1.312vCORE , there is a dropping...



FX-60's details

mine funny case... set in bios 1.50 but while load the uguru detect 1.52... mine vdruuUP ah??? lol...

I finally understands the reason behind vdroop from this article which briefly explains vdroop in layman terms. Take a look (2 pages of vdroop/voffset): http://www.anandtech.com/cpuchipsets/intel...aspx?i=3184&p=5



At the same time, can read about QX9650 running at 4Ghz at 1.28v!!!!

This post has been edited by kmarc: Dec 19 2007, 06:12 PM

That's Pennryn right?
Well, sooner or later all of us would own it (when the price drops)

4ghz @ 1.28v?...=.=

By using application to measure the cpu voltage, a drop in voltage, vdroop happens when the cpu is under load.

Just out of curiosity, would a PSU which is not enough juice shows the same effect in the application readings?

Which means, the readings is a vdroop effect else might be a sign of PSU lack of power?

This post has been edited by theodore_kh: Dec 20 2007, 10:23 PM

Just to revive this thread, seems like there's a lot of misunderstanding here.

I'm going to define vdroop loosely in layman's terms and just say that the voltage to the processor DROPS when the CPU is under load instead of maintaining a constant voltage.

Indeed there are some articles which state 'vdroop' as a feature to prevent damage when switching from low to high loads. I am unable to verify this.

However I believe the problem that Asus motherboards face are of a different nature.

The vdroop I experienced in my Asus P5KR, a P35 motherboard causes masses system instability under relatively low overclocks.

Rig:
Q6600 G0 stepping 2.4 ghz default
2 gig Team Xtreem DDR2 1066 RAM
Asus P5KR with latest BIOS
850W Gigabyte Odin
2 x 4850 in Crossfire mode
Vista Home Premium

MY BIOS DOES NOT HAVE THE VOLTAGE DAMPENER OPTION!!!!! Apparently it also doesn't work for the P5K vanilla mods even when listed, only working on the Premium P5Ks.

Tools used:
CPU-Z
Speedfan
Lavalys Everest
Prime95

First of all this is what the situation was before I did any mods

a) When set in BIOS under Auto, voltage is reported in CPU-Z as around 1.385 which fluctuate in around a 0.07 range.
b) When set in BIOS under 1.400, voltage is reported at around 1.375 in CPU-Z which then fluctuates again in around 0.07 range
c) These fluctuations happen when the system is under load for example when PRIMING and the voltage REMAINS below the set voltage.
d) Errors occurred in the Prime95 frequently and system blue screened under both Auto and 1.35 V settings. 1.4 V still crashed but less.
e) Could not OC past 2.8 ghz

I also tried this with my old Intel Core 2 Duo 6400 and could not go past 3.2 ghz.

Now after I applied a pencil mod to my P5KR
a) when bios set to 1.375, it is reported as 1.375. very little fluctuations around the 0.01 range.
b) Under load, voltage was maintained at 1.375 with it peaking up to 1.384 during the transition from low load to high and then stabilized again at 1.375. Nothing to be alarmed about.
c) No errors during Priming at 3.0 ghz with 333 mhz FSB and 9 multiplier. RAM was set at 1:1 at 667 5-5-5-12 just for troubleshooting purposes.

Therefore...if you are overclocking and finding that your system is unstable even at moderate overclocks, time to take out that 2B pencil and start shading Just google it up P5K pencil mod and find a pic that shows your setup. Do note that the P5K Premium has a diff layout than the regular P5K (and P5KR).

yes. i read some articles said like that. there will be a very short time that the electric current (or voltage? cant remember correctly) will jump much higher than it should be during the change from low to high load. this phenomena is the threat to our cpu, as the high current will burn out the cpu. so vdroop is kinda normal. of course OCers are looking to minimize it, but it is something to protect the cpu.

that is what i have read. i cant remember where i read that though. please correct me if i am wrong.

Vdroop is there to protect both the CPU and motherboard mosfets from from overshoots in load to idle transitions

Take for example, On the P35-DS3, the bios set voltage is the absolute max that the cpu will be fed considering from overshoot from load to idle transitions. That is why upon monitoring, the droop appears to be alot.

This implementation should be apparent in most motherboard that do not have load line calibration.

This "phenomenon" is there due to the current limitations of power delivery designs, as the capacitor and chokes feeding the cpu with power require a "split" second charge up, as well as discharge. It is also apparent in gpu's as well.


However, if you understand this and would still like to mod the board for a lower droop, all you need is a multimeter and a pencil

This post has been edited by bryanyeo87: Jul 10 2008, 03:32 PM

nice explanation there bryan, though i dont really know what you mean, im noob lor..

so does it mean the vdroop is controlled by mobo to prevent the "limitations in psu design" from burning our cpu?vdroop is really made to be exist by mobo manufacturers intentionally right?so using a pencil to to get a smaller vdroop is kinda suicidal also right?

it means,

its there to protect your CPU and the mosfets from voltage spikes.

penciling to get a lower droop is not suicidal, just that it lowers the lifespan of the mosfets(quad cores and high speed cpus, oced, etc etc 4ghz >) /cpu (voltages exceeding 1.4v)

So it doesnt matter if the board is a DFI, asus ROG, or even a lowly ECS mobo, they all suffer from the same thing. no/less droop = less life span of both mobo and cpu.