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I just fried my asus today trying to do a the vddmod.....needless to say I dont wanna fry anything again. Im picking up a 8RDA+ on monday and would like to verify what I need to do. Is this correct way to get 1.85v:
pin1---------------720ohm resistor--------------ground
Ill be using a smd grabber to pin1. or
pin1-smdgrabber------------720ohm------------smdgrabber-pin4
This should work right? which would you guys recommend... thx
That would work yes, it certaintly shouldn't fry anyway. Personally I would go with the pin 1&4 combination.
LikwidKool:
I got the soldering iron kit at the shack with the solder already in the box. I believe its the one u are talking about. Just a straight stick 30wats. It takes about 3min befor ready but gets the job done. There is no solder size couse u melt it on to the wire and then put the wire in place and touch it with the iron to get it to melt over the correct pin.
Alright I get it. I just thought I bigger piece of solder would create more mess, therefore a smaller gauge would be more trouble free.
Thanks for the reply. I hope mine comes out as good as oyurs. My board get's here tommorow. Wondering if I should do the mod before I even install it or see how it runs first. Hell, who am I kidding. Mod it first!!
I just had to comment on this, I recently picked up a 8RDA+ and probably will to this mod later on down the road. I keep seeing questions come up about the resistor...variable, fixed, death, which way do I turn the pot the list goes on. Not once have I seen anyone post anything about using a fixed resistor in series with a variable. It's Ohm's Law, you should know it before you even pick up a soldering iron. If you find out what resistance lets say 580 ohms runs you at 2.0, thats realy high and may not be correct figure but I will use it as a example. Now if you where to attach a .5k (or a lower value) variable in series to the the 580 ohm fixed you will now have fail safed your mod. The fixed will not let you go above a set voltage and the variable will alow to to trim down the voltage to what ever you desired. Now you wont have to worry about overvolting the board beyond the fixed resistor values. Just my suggestion if you still want the room to turn it up or down.
I found that the radio shack resistor (1k) is by far not sensitive. I had to turn and turn to see the volts rise. Safety is not a problem with the one i used couse u just can't accidently go too high if u are sober.
To be honest with u i learned about resistors from doing this vdd and i still have no idea how to calculate resulting vdd. I;m a complete newb in this stuff but i just know how to make it work safely thanx to the help i got from XS.
hey guys... well mainly professor but that link to RS doesnt work
Yeah sorry for the broken link. The pot is not sensitive enough? Its a 15 turn pot and the idea is that it is not sensitive so you don't kill your ยงยงยงยง by turning it too fast. Perhaps someone can give you a link to calculate voltage but i know there are some sites or you can calculate it yourself (though i don't know either off hand).
well, VDD mod a sucess, I wilol post pics and thoughts later.
Prof, I copied and pasted your guide into another forum where ppl were asking how
I gave you FULL credit for the guide. I will supply you with the url if you wish? Also if you want me to take it down. I will too. :)
Lol i have no problem with anyone posting this mini guide. Oh and btw what was the link? I'd be interested to see how people are faring with it.
the site has been down for a few days, when it goes back up, I will let u know :)
Thanks guys.Vdd sitting at 1.8 after following the guide in the thread.Was a bit concerned that I screwed it as my soldering iron's head was a bit big,but up and running at 200x12 . 184x12.5 was the highest I could get stable before the mod.Removed the nb heatsink,AS3'd it and stuck a 60mm fan on top just in case.
Damm,just realised I forgot the fit the mosfet heatsinks.....:slobber:
Thanks again :banana:
Prof, here it is.
http://www.bigfootcomputers.com/cgi-bin/yabb/YaBB.cgi?
board=hardware;action=display;num=1044540173;start =
bump i know some guys will need this guide lol... the question pops up everywhere
well I screwed my first try. I got a blob of solder on all the legs and didn't get it all out. I thought it was good and tried to start the board, but just the fans spun. No POST led or POST beep. I took it back out and just kept heating and moving, and it all cleared up and looks like new.(sorta) She started back up with no problems whatsoever. I have another day off tommorow so hopefully I will have the time to try again. I am prepared this time with a desoldering squeeze bulb, and some desoldering thread:)
So I took another crack at it today, and it's VDD Goodness! Have it set to 1.76 vdd right now for starters. Already working because 200fsb would give me the flicker and right now it is solidly stable!
BTW just to clarify cause I did it wrong first and it wasn't really clear:
On the pot the hot wire is either side, and the ground is the middle leg. Also on the chip itself, pin 1(hot) is on the left and pin 4(ground) is on the right if you were looking at the chip head on. As per what I had read, and the pics I saw, I reversed everything and when I booted at first and didn't see a change I got worried. Then I searched through a bunch of threads and found the right info. Funny that all the pics I saw have the black wire on pin1 and the red on pin4, which normally red is hot and black is ground.
Thanks for the help guy's. I owe you one!
a couple questions before I do this...if I get the adjustable pot do I still need to get a resistor? what ohms should I set it at if I want about 1.9vdd (i'm going to have a waterblock on the northbridge so i'm not concerned about the heat)? Where and how did you attach the pot to your mobo, all the pics i've seen just had it sitting there out of case. So if I don't need the resistor, is all I need the pot, and battery wires? Which pot to get the 1k or 10k?
mine is using a 10k 15 turn cermet pot . That is all I was able to get from Rat Shack. I believe though the one to get is the 1k 15 turn. It just took a while of turning to get it all the way down. I set it at 1k and then adjusted it per the bios reading for vdd. I have heard to turn slow, and wait a little after to let the change settle.
My pot is just hanging there at the bottom of the case on the little plastic drive rails.
LikwidKool: I made an update for ur question on cable placemen on the vr. I was also confused when doing it the first time.
EDIT: Sorry link LOL i just glanced at ur name. Man I was way off :toast:
Thanks PimpJack. That should make it a little easier for others.
BTW it is LikwidKool, not Linkwood. That is the second time. 3 strikes you are out!:DLoL!(totally kidding, need to clarify because you can't see the big smile on my face!:D)
Hey guy obviously I don exactly understand why r u doin a Mod like this. From reading thru BIOS monitoring Vdd is the AGP voltage. But from all the thread I read it seams it's VCORE the ones being discussed? I'm right? Sory 4 being so ignorant. 1 more thing there's a 1.90 VCORE in BIOS right? Why not use it?
If so is it really safe if I do it right? Choices of POT or fixed resistor?
Anyway not to have V mods for high speeds?
THANKS!
vdd in bios health section is the chipset voltage. There is no vagp reading and u can also see a vcore (cpu) and vdim (memory)
I would use a variable so u can increase/decrease ur voltage. And no the vdd )chipsetvoltage) is not adjustable on the 8rda's thats why we have the vdd mod.
Also a *bump* for Rudzer (i hope I got ur name right LOL)
Hi all, I'm thinking of using a fixed resistor instead of a pot. It is like what I did on my 8KHA+ (using 200K Ohm resistor for Vmod)
Can someone please let me know and correct me if I am wrong, a 720 Ohm resistor will get you around 1.7-1.8 VDD
Therefore if I get a resistor of a lower value, 600 Ohm for example, will allow me to get a higher VDD (perhaps 2.0 VDD) ?
Thanks and if possible, please suggest to me what resistor I should use, 720Ohms ?