Do I have the worst vdroop ever?

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blade52x

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This is what I get setting 1.4V in the bios (look at the cpu-z voltage)...

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vdroopcj0.gif


:(

1.4V needed to run to the chip at stock under load. at default it drops to 1.268 or something like that.
 
Yep, that's a lot of voltage droop alright but does it really matter?

On my P5B I need to set it at 1.45 volts in the bios which gets me 1.424 volts while idle in Windows and 1.392 volts while running Orthos. I just ignore the number in the bios and set it to whatever the cpu needs to be stable.

If I wasn't able to get enough voltage to my cpu then that would be a problem but I think the bios goes up to 1.70 volts so no worries. Besides, running a little bit of extra voltage while the processor is idle doesn't hurt anything.
 
I get plenty with my 6400/P5B-E too (1.4v becomes 1.312v under full load), although I didn't have any stability problems running default voltages up to 3GHz. Vdroop is normal, but needing more juice to run stock speeds is not. Doesn't sound promising for overclocking, that's for sure.
 
Oh, I didn't type if properly. I meant 1.4V needed to run the chip at true voltage under load, not running the chip at stock speeds ;)

I just thought it looked terrible because on my Rev1.0 board it went from 1.4V in bios to 1.376V under load - and that was enough voltage to run 3.33Ghz stable and maybe slightly more.
 
You may be unfortunate to have a sensor that is way out of spec, its quite possible.
I've had some truly bad ones in the past.

The voltage doesnt really matter as long as its stable and your temps are good.
 
You guys are actually right.

At first I was worried about too much voltage which could cause high temps, but I realized I leave C1E & EIST enabled, so even if I go 1.5V - the most I'll ever get up to 1.424V under load, which should give me a good 3.4Ghz - and idle the multi will drop, as will the voltage.
 
Ummm... CPUZ is reading voltage wrong?

Try SpeedFan or Everest and see what they say.
 
Yeah, you can load up speedfan, cpu-z and other cpu report programs, and ill bet you they all show a different vcore.
 
Dont know for sure but I think cpu-z is reading the Vid set by the chip (normally used by the chip to signal the VRD Voltage Regulator Down circuity as to what voltage the chip wants) Setting higher voltages (forcing the output voltage of the VRD to some set value) should be independent of Vid, but I dont know for sure. So I dont trust cpu-z or anyting else and if you throw in EIST or other "throttling" bios options that can mess with Vcore, who the hell knows what is going on. /shrug.

the only thing I do know is that when I set Vcore in bios to high values CPU-z does not track it linearly and topps out at the highest Vid my chip supports, so I suspect the above and just go with the Vcore setting in bios.


oh and with EIST enabled vdroop is a "good" thing, it prevents overvoltage transients from quick changes in current draw (like from going from idle to full speed when staring up orthos) from damaging your chip. Some Vdroop is designed in by Intel in the VRD design spec. Not going to say what I think of the "mods" posted all over that dont bother to provide that little bit of info.
 
Speed fan reports the same as cpuz (at least on stock it does).

When I use default 1.325V in the bios, cpuz reads 1.264V under load and SpeedFan reads 1.26V....

I'll try 3.33Ghz at 1.4V bios, and see if it is stable - if not, this board has big vdroop.

Edit: Failed in 1 second - damnit. Well, wasn't planning to run the o/c there anyway since it gets to hot in the summer. Rev3.3 boards really do o/c worse than 1.0 boards.
 
blade52x said:
When I use default 1.325V in the bios, cpuz reads 1.264V under load and SpeedFan reads 1.26V....
Click to expand...
1.325 - 1.264 = 0.061 voltage droop

My P5B Deluxe board:
1.450 - 1.392 = 0.058 voltage droop

Comparing your DS3 with the 965 chipset to my P5B with the same 965 chipset shows the exact same amount of voltage droop. It's a meaningless number.

Set your memory to 2.1 volts, set your bios to 1.45 volts and you should be Orthos stable at 3300+ MHz and beyond without too much trouble. I didn't even have to play around with chipset voltages or anything once the basics were set on my previous DS3 to run this speed.

The DS3 is effortless to overclock. Get it set up properly and enjoy the great performance.
 
It's actually more than 0.061 usually, that's just when it's at stock :p

Right now I set 1.475V in the bios, and get 1.392V under load = 0.083 drop - but I'm not going to complain. I'm testing this right now with 3.4Ghz stable and staying under 65C during Orthos testing. I think I found myself a new winter overclock.

By the way - it's 1.424V idle, so does that mean the highest the chip ever goes is 1.424V even during boot regardless of what I set in the bios?
 
I had worse on my p5b vanilla. 1.425v set, 1.312v load. Then, of course, after vdroop mod, 1.300v set, 1.304v load, 1.296v idle
 
If it's stable who cares but yeah, that's some pretty severe droop.

I think mine is 1.3625v bios, 1.328 CPU-Z and at load it drops to 1.312.
 
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