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 VDroop... what izzit?, does it affect other brands too??

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kmarc
post Aug 13 2007, 01:03 PM

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Question on this Vdroop thingy....

Say that I set 1.45v vcore in BIOS. In windows, vcore is 1.41v and at load it drops down to 1.38v (using any app e.g. CPUz or speedfan)

If that is the case, if I compensate for the vdroop, would this put too much strain on the proc? e.g. 1.50v in BIOS, 1.45v idle in windows, and vdroop 1.41v.

I mean, if the CPU is running at 1.41v at load due to vdroop, then theorectically the CPU is only receiving that much amount of voltage rather than the vcore at idle, right? (which is 1.45v in windows or maybe correctly at 1.50v as set in BIOS)

Anybody can clarify this?

Note : I realize that software monitoring is inaccurate but for the drop in voltage, I guess that would be quite accurate right?

This post has been edited by kmarc: Aug 13 2007, 01:04 PM
kmarc
post Aug 13 2007, 04:46 PM

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QUOTE(gengstapo @ Aug 13 2007, 04:21 PM)
if u gotta DMM, then its better to measure the voltage. both bold value consider as vdroop  icon_rolleyes.gif

it should be stable in any situation no matter idle or load..
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Thanx for the clarification. Another question laugh.gif, some people suggested that to reduce the vdroop, you have to increase the vFSB. Is this a myth or truth? (Bring out the mystbusters!!!) laugh.gif
kmarc
post Aug 13 2007, 05:14 PM

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QUOTE(gengstapo @ Aug 13 2007, 05:07 PM)
not quite sure as ive try upon my board(asus), still the vdroop margin kinda high

ex, my current BIOS voltage for cpu was 1.400v but when i restart my pc & go into voltage monitoring(in BIOS environment) its fluctuate between 1.344v ~ 1.36v even increase the RAM, SB, SB Pci-e & NB voltages, its still da same  rclxms.gif
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Yeah, my vdroop was still the same even though I've increased the vFSB. I though it was because of my DS3 (the cheaper good performance mobo!).....
kmarc
post Aug 14 2007, 07:06 AM

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QUOTE(remysix @ Aug 13 2007, 05:16 PM)
so, no problem during the load stage...just that i need to set a bit higher in bios to achieve the target voltage sweat.gif
Don't go too high on the vcore though..... and watch you load core temperature too.

How much higher are you thinking of going? hmm.gif

This post has been edited by kmarc: Aug 14 2007, 07:06 AM
kmarc
post Aug 15 2007, 03:52 PM

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QUOTE(NightRaven @ Aug 15 2007, 02:01 AM)
haha guys u cannot change the boards vdrop and vdroop.

vdrop is the difference between bios set and idle real.

vdroop is the difference between idle real and load real.

the only way a board can change its vdrop is bios.

the only way for a board to have less vdroop is mod. u need to pencil mod or something to "overcome" that vdroop. so always remember to set mroe voltage for u get less.

also different fsb and cpu volt ahve different drops and droops. usually the higher u go for ur fsb and mhz, the higher your vcore, the more the droop and drop.

personally gigabyte dq6 series has the least vdroop (virtual 12 phrase)and asus boards like striker and blitz have the least vdrop - 8 phrase
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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..... hmm.gif

QUOTE(remysix @ Aug 15 2007, 10:58 AM)
wow...the vdrop is so bad one...0.045v hmm.gif
so again: migrate!migrate!migrate!migrate to P35 tongue.gif
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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..... sad.gif
kmarc
post Dec 19 2007, 06:07 PM

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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

QUOTE
Actuality, load line droop (Vdroop) is an inherent part of any Intel power delivery design specification and serves an important role in maintaining system stability. In most cases, comments regarding unacceptable power delivery performance are completely unfounded. To make matters worse, unjustified negative consumer perception surrounding this often misunderstood design feature eventually forced a few motherboard manufacturers to respond to enthusiasts' demands for action by adding an option in their BIOS that effectively disables this important function.


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

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