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I finally found some time to take the photos and upload them :D
Off we go.
http://www.elektroni.fi/Stilt/P5WD2-...EP_DDR2VDD.jpg
http://www.elektroni.fi/Stilt/P5WD2-...-EP_MCHVDD.jpg
http://www.elektroni.fi/Stilt/P5WD2-...Vcoredroop.jpg
I´ll post the Vcore mod soon.
very nice!
Nice pics Stilt. I've been running these mods for a few weeks now. People should be aware that the Vcore mod works better without setting the pot too low trying to get minimum droop (< 10 millivolts). On the scope, there was a lot of switching noise present that isn't caught by traditional monitor programs when cranking way down on the pot. (minimizing resistance). Although the droop was great, the switching noise not picked up by monitors made my system MORE unstable than setting it for 20-30 millivolt droop. Wouldn't recommend setting the pot lower than 30K ohms either. This mod alters the Analog Devices already present droop circuit that seems to be tuned for 65AMPS and I'm playing around with an R/C network into the feedback pin that allows Vcore ro RISE on load. Sorta like afterburners....
Hey man, That was my first post on this forum..
Should I know anything else, before modding my Asus , or is there another better instruction?
Alba
Not to answer for the stilt, but these illustrations look very good. Just be real careful you don't turn the pots down to zero resistance. I'd also set the pot for maximum resistance when firing up the board for the first time and tweek them down slowly until you're happy.Quote:
Originally Posted by Albatroner
Sorry Stilt for answering for you...All credit goes to you for these great illustrations:toast:
Thanks for sharing this info!!!
I modded my P5WD2 Premium (955) according to the older pictures.
In those picures, the connection for vDroop is slightly different.
Why is that? Should I change it?
Another problem is the fact that when a peak of more than 1.7V on the mosfets (so not the actual vcore) occurs, my PSU shuts down.
Is there a way to override this "protection"???
Or could it be the Tagan EasyCon 530 (combined load on 12V lines)??? Recently switched from OCZ Powerstream 520 to this one...
Man, P5WD2-E is NOT the same than P5WD2, so you've done the right mods.Quote:
Originally Posted by OneyedK
About the peak problem, i dont know...:(
Hope it's a PSU-issue, the Tagan has a switch to choose between split and combined load on the +12V-lines... Alas, not very well documented :-(Quote:
Originally Posted by ^don.k's^
where i can find Vmods for the P5WD2?
Full credits to the Stilt:
http://www.elektroni.fi/Stilt/P5WD2-Mods/
thx a lot Oneyedk
Anyone knows if the mushkin ddr2 5300 would like this vdd mod? I'm asking that cuzz the max voltage related in mushkin website is available on this mobo stock, with no mod...
@Stilt
which resistance of rezistor will be best for droop mod? what is the perfectly resistance for your mobo? I want to use the 30k resistor and I think that the best effects we will take ~20k
that vdroop is different. I saw one for the chip itself and a 50k pot.
Anyway, do you use a multimeter to determine the ohm of the resister BEFORE you solder it in place? What should the reading be before I start the computer?
One last think...was it worth it?...Did you find a difference doing the vdroop mod?
please post the Vcore mod ......Quote:
Originally Posted by The Stilt
Those are very nicely done man.
BTW, what camera did you take those shots with? I am terrible at macro stuff.
This mod is for those timid or over caffienated people that don't want to take a soldering gun to your mobo. This is no joke and works quite well. The goal is to lower the resistance of the Analog Devices droop circuitry from about 75k to 40k ohms. The PIC below has a "proper" vdroop mod, so please ignore the wires and pot which isn't required. Should be able to do this mod without removing the mobo.
Sharpen a #2 or any other soft lead pencil really sharp. Jam the tip of the pencil between Pins 17 and 18 of the Buck Boost converter/regulator. Rotate the pencil while applying slight downward pressure, then snap off tip of lead so it remains jammed between the pins. Low risk, should keep droop under 20 millivolts:
http://img348.imageshack.us/img348/6...ettomod9tn.jpg
As crazy as that sounds...it would probably work :)Quote:
Originally Posted by proth
LOL.. It has to work...I'm modding a board for a buddy on Wednesday but will try this and post results and Pics with the lead jammed in there, should be a pisser of a photo. Then I'll do the real mod. The only question is if the pencil lead can go down to 30-50k ohms to actually be effective.
Hmm this is interesting, could something else be used? Say a small clip of some sort or maybe a couple strands of wire? ANy specific reason why you say use #2 pencil lead? I have no idea how everything works when it comes to electronics, but Im gonna guess it has something to do with the materials resistance?Quote:
Originally Posted by proth
Id also like to see some final resaults, Id try just about anything at this point to get rid of my droop. screeny bellow.
Dont want to use just bare wire - short circuit.Quote:
Originally Posted by adeoliver
Yes, he used pencil lead due to it's resistance properties.
Man, Your droop is about as bad as the P5WD2-E gets. Don't try to use anything but a pencil led or you'll waste the mobo and maybe the CPU. The lead lowers the resistance between the pins, not shorts them together. Even though this looks simple, it has to be done very carefully or you will definately damage something. The best way is to mod the board as the Stilt describes at the top of this post. You may want to put heatsinks on the MOSFETS which helps a little. There are a few posts on this already in other threads. You can search for them with the search toolQuote:
Originally Posted by adeoliver
Thanks. I plan on doing the VR mod on it. Ive done some test runs on an old epox board, so now Ill have no problem doing it to my E. Thanks for all the info.Quote:
Originally Posted by proth
Quick question.
As you may remember on the p4c800 the droop is made with a 50kohms resistence regulated to 28khoms.
In the p5wd2-e is there a "known" value that we can regulate the 60kohm resistance before soldering ?
Or we need to lowering till we find the perfect spot ?
Thks guys! ;)
The droop is different depending on what CPU your're running. A single core draws less current, and will droop less than a dual core.
I took a 100k resistor set to max and booted the board into Windows and then compared idle and load voltages with a DMM and adjusted the droop on the fly.
Some notes:
- I have had troubles when setting it to zero droop, so I usually leave it at 10-20mv.
- Load it to 100%, SuperPi is not enough.
- It you start with 1.400 idle and 1.320 load you might end up with 1.480 idle and 1.470 load because the droop mod increases the voltage aswell. Take care with Presler when doing this.
- Also make sure you measure the vcore at the CPU side of one coil to get a real value. (There is a voltage drop across the coils which should be taken into account)