Pencil vdroop mod P35 DS3R

MoRT489

MoRT489

MoRT489

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Joined
21 Aug 2006
Posts
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Hi guys

Thru a bit of googling i found this vdroop mod by thom59 for my board. Decided I want to give it a go as I can boot into windows at 3.4/5GHz but crash during orthos and i put this down to not enough vcore at load.

Problem is the picture on the linked post doesnt show where on the mobo this is so I wonder if anyone who has tried this mod on their DS3R might be able to post a pic/guide. (btw mine is rev 2.1).

Highest i can set in BIOS is 1.600v but that gives 1.552v CPUz idle and 1.520v load. Figure if i can get the volts up a bit it might be stable otherwise i'm stuck at 3.1/2GHz :(
 
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Flash the BIOS to the F10 BIOS then in the overclocking section, enable "Load Line Calibration", say goodbye to massive vdoop
 
Well it works:

Before

BIOS 1.59375v
Idle 1.552v
Load 1.520v

After

BIOS 1.59375v
Idle 1.568v
Load 1.552v

This is using a pencil rather than conductive paste/solder which i will try if i can be bothered to go to a hardware store.

Unfortunately the extra vcore doesnt give me any more headroom for overclocking :( This chip just doesnt like being above 3.2GHz
 
But does't that mean putting lots of vcore through it whilst it's idle? Is that bad or ok as long as the temps are reasonable?

I've always though about doing the mod on my p5k - 1.45v in bios gives 1.38v idle (vdrop?), 1.28v under load (vdroop?) :(

What would a safe idle voltage be for a Q6600? atm I run it with the above voltages at 3.2ghz..
 
Not really any such thing as a safe voltage for the Q6600. Temps are more inportant.
 
Ste said:
1.45v in bios gives 1.38v idle (vdrop?), 1.28v under load (vdroop?) :(
Click to expand...

Correct re drop and droop. It was very easy to do and can be easily corrected using a rubber/eraser.

MikeHunt79 said:
vdroop isn't really a problem really, you just need to set your vcore higher.
Click to expand...

Yea but by eliminating vdroop the load vcore is higher, and as my board doesnt go higher that 1.6000v in Bios (other than 1.8v:eek:) and my idle voltage was only 1.552v i was hoping to be able to get the load voltage to be closer to that in the bios.
 
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What would happen if you did the pencil mod AND enabled load line calibration? I have the maximus formula X38 board and I know there is a pencil mod for this board and a bios with LLC.
 
creed said:
Yea but by eliminating vdroop the load vcore is higher, and as my board doesnt go higher that 1.6000v in Bios (other than 1.8v:eek:) and my idle voltage was only 1.552v i was hoping to be able to get the load voltage to be closer to that in the bios.
Click to expand...
Ahh, I see... You must have some pretty damn good cooling. I guess the Vdroop mod would work here, maybe if you try solder it may lower the vdroop further...
 
MikeHunt79 said:
Ahh, I see... You must have some pretty damn good cooling. I guess the Vdroop mod would work here, maybe if you try solder it may lower the vdroop further...
Click to expand...

That is of course the other issue, at 1.55v load my chip is hitting 73ºC under Orthos, which is the max recommended temp from Intel, so i cant really go higher than this anyway so not much point in soldering :(

Under a Tuniq Tower btw.
 
I have copied this from a post that I have previously placed regarding vdroop....

There is also an explanation here about Intel's design of the vdroop factor within the chipset...

http://www.anandtech.com/cpuchipsets/showdoc.aspx?i=3184&p=5

a small quote about the possible dangers of removing vdroop...


So what happens when we remove both Voffset and Vdroop? The answer is simple - bad things. Although the difference between the maximum positive and negative peak overshoot are the same, severe violations to the CPU VID limit occur. If you're asking yourself what's the problem with this, consider the case of a CPU VID of 1.60000V - because the user feels this is the absolute maximum CPU voltage that they will allow. Just how high do you think CPU voltage will go after leaving a heavy load condition? We can't be sure without knowing more of the details, but we can certainly conclude that it will be well in excess of 1.6V. If you've ever run a benchmark only to have your system crash right as it finishes then you have experienced the consequences of this poor setup.
Click to expand...

Finally, let's take one last real-world look at the consequences of removing Vdroop. ASUS' implementation of this feature, labeled as Load Line Calibration and included with their latest line of motherboards, is particularly worthy of our attention for a number of reasons. The first is that setting lower voltages with this option enabled actually results in a condition in which the CPU voltage under load is higher than the idle voltage. Imagine our confusion as we desperately struggle to understand why our system is Prime95 stable for days yet continues to crash under absolutely no load. What's more, in spite of the absence of droop and for reasons unknown, enabling this feature artificially raises our CPU's minimum stable core voltage at 4.0GHz from 1.28V to about 1.33V. As a result, our system uses more power under load than is otherwise necessary. Our efforts to reduce our processor's supply voltage backfired - instead of lowering the system's total power consumption we managed to affect a 20W increase.
Click to expand...

Hopefully we've shown you enough to understand exactly why Voffset and Vdroop are important. Please give second thought to your actions if you're in the habit of defeating these essential system safeguards.
Click to expand...




also a technical document...

http://www.thetechrepository.com/showthread.php?t=126
 
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