P4C800-E DLX CPU voltage drop, can someone help?

[mr. Charles]

......It should be stated that for this modd on the P4C800's motherboards, the location of the "ADP3180"chip is found "UNDER" the left side of the CPU/HeatSink bracket. >>>this, you must remove first to locate, and access to the soldering point's; then replace bracket.......etc......etc......[ just my 2 bit's worth of helping for any who can't see it; compared to the P4P800--board's, (which the chip sit's just outside of the bracket).......... ......... ..........

[DEVIL_DK]

Originally posted by The Stilt
macci told me much easier way to do droop on P4C800 mobo.

Solder vr between those blue dots. I almost *cked up my mobo, when I used to thick wire and condensator almost fell off , so it was alot easier to solder on those dots.

DU you have a link to his mod i cant see image here.

or can you mail it to me ?

can i use a resister that is fixet ?

[BlackHawk2383]

Well i broke the small cap while trying to do this mod...dont know how i did that...too much heat i think cause the damn thing to tombstone. Does anyone know the value of the cap so i could replace it.

BlackHawk

[PIRATA!]

There's no value that I can set to the vr. that give me a vcore of 1.75 for example!

Option BIOS -------- Reading BIOS
---- 1.525v -------- 1.632v
---- 1.600v -------- 1.690v
---- 1.625v -------- 1.850v

Something isn't right in this droop mod...

When I measure the vr. in the mobo, the max. that he gives me with a multi is about 45k, and I used a 100k vr., is this normal!?
It will be better to substitute the 100k vr. for one of 50k?

Thanks in advance!

I have the same problem!!!!
I have a P4C800-Delux (Not E) and I made the VDrop mod using a 28K resistor (27+1 soldered together).
I first used the 2 free dots (those far from the capacitor), but after booting up the first time, I realized that something was wrong. The mobo booted up after a few tries and after that, Windows was unstable.
I then removed the mod, and the computer started to boot up again.
I tried finally the 2 capacitor sonder points, but the mobo was still unstalbe and it was hard to boot in Windows.
I last remooved the mod just to go on the net to se if I was making the wrong VDrop mod, but after Windows boot I still noticed that the system was unstable.
After a few tries I realised in bios that the VCore setted up in the CPU Settings where different from those I was reading in the internal motherboard bios Volt MM.
I had:

1.525 -> 1.423
1.587 -> 1.484
1.600 -> 1.507
1.625 -> 1.602

I lost every voltages between 1.5 and 1.6!!!
I now have a new P4C800-Delux mobo, but I am afraid about making the VDrop mod again.
What was wrong???
What do I have to do for do a good VDrop mod???
Is there a way to do the mod good without problems???
Thank you very much.
Please help me!!!

Finally... why someone here is saying that a 35K trimmer is better????
Was'nt a 28k trimmer/resistance??

Thnak you very much again.

[parcifal]

I have done a mod for a P4P800S-X board which seems to be a bit different than other P4P boards as this is a smaller design with other chips.
On my board i got a RT9602 / RT9241B chip combination for the VID inputs (5 bit) to mosfet driver.
I found out that it works great to modify the Vadj input at pin #8 on the RT9241B which is a 20pin smd chip.
Origional it has a external 5k9 resistor to ground from pin 8 , so doing a modification with a 10k VR in parrallel results in lower resistant and it worked.
normally my vdrop was about 80mv in stressed , now after the mod my vcore is around 0,15volt higher in idle and stressed it even put the vcore 30mv up instead of drop down -)
i need to do more testings at different overclock situations but it seems to work great this way
In bios vcore setup as 1,600 v (this is the highest setting posible in my bios) but output messured in Speedfan and CPU-Z is above 1,700 anyway =)
Maybe if i use another cpu that the vcore setting in bios can put higher than 1,600 .. or is this just a fixed maximum for every cpu in this board ? ... have to find out soon.
I hope to with this helped some others too with there mods, I wish to put pictures but its too hard to make them, as things are too small.
But the mod is as simple as put a extern resistor or VR in parralel to the exisiting resistor which is on the board in front of the pin8
solder a wire directly onto the chip pin8 and find a ground point what you like , i use the screwhole tinned surface to ground the VR what make it easy for the solder job.
Sugestions / idea`s / questions welcome !