resistor on VDD mod!

[Venom]

Due to that I can't have a stable system at 200 fsb I have decided to do the VDD mod. I have in mind using grabbers cus I don't have any soldering skills of any kind. Now to my question what resistans should the resistor have I'm not going for the adjustable ones, the one I have had in mind is a 820ohm. Is a 820 to strong or should I use something with less resistance like 750 or 680 ohm. At the moment my VDD is stable at 1.56.

So any tips and hints are welcome.

Best regards Mashi.

BTW my first post at this great forum.

[tweaky]

820ohm would be fine. That should give you about 1.75 volts.

Welcome to xtreme :toast:

[Venom]

thanks man, yeah I thought so, I will quite "safe" with 820 ohm don't you think.

[tweaky]

Yup as I said it will be fine. I started out with 750ohms, and i'm now at 1.85vdd :)

[k1114]

my 1k ohm resistor gave me 1.78vdd, but I had a 1.6vdd to start. Im going to do an 820 next if I can find one.

[Venom]

Great then I will go for a 820 ohm to start with, I have another quesition should one ground to pin4 or to like mobo screw or something like that.

[tweaky]

Use pins 1 & 4, it looks neater :D

[Xizten]

Some guy in sweden was having problem when grounding to his box, but when changing to PIN 4 hiw probs were gone.

[Venom]

ok, I have decided to go with pin 1 and 4, I will use these grabbers http://www.elfa.se/elfa/produkter/se/20/2002939.htm

[k1114]

I suppose you should just read the vdd mod section here (http://members.cox.net/psj4) :D

[Venom]

Really nice FAQ, good readin keep up the good work :toast:

[spaceman]

Originally posted by k1114
I suppose you should just read the vdd mod section here (http://members.cox.net/psj4) :D I'm glad I clicked on your link, I learned a couple things about the BIOS that I was a bit unsure of. :cool:

[Naasar]

Originally posted by k1114
my 1k ohm resistor gave me 1.78vdd, but I had a 1.6vdd to start. Im going to do an 820 next if I can find one.

i plan on using a 1k 1/4 watt resistor too when i get my smd clips this week. do u think at that voltage my vantec iceburg on the NB will keep it cool enough? it runs at 1.58 to 1.60 now with no mods and the thing never even gets warm in a hot room. my mosfets on the other hand will compete with a dam blow torch. hehe:stick:

[spaceman]

Question guys. Obviously, I'm no electronics whiz kid, but I can follow instructions. ;) Starting with a 1.5 vdd on my Rev. 1.0 board, I did the vdd mod using a 680 ohm resistor. This brought me up to 1.8 vdd. It seems to be only stable tho at 200 FSB. Got into Windows @ 210, but not stable. So if I change to a 560 ohm resistor, that will bump my vdd up, right? Can someone tell me what to? (roughly) And what's the highest "safe" vdd? Thanx much. :)

[k1114]

Originally posted by spaceman
Question guys. Obviously, I'm no electronics whiz kid, but I can follow instructions. ;) Starting with a 1.5 vdd on my Rev. 1.0 board, I did the vdd mod using a 680 ohm resistor. This brought me up to 1.8 vdd. It seems to be only stable tho at 200 FSB. Got into Windows @ 210, but not stable. So if I change to a 560 ohm resistor, that will bump my vdd up, right? Can someone tell me what to? (roughly) And what's the highest "safe" vdd? Thanx much. :)

If you got 1.8vdd from a 680 ohm resistor, your starting voltage was 1.55 not 1.5! If you use a 560 ohm resistor you will get roughly 1.864v which is as high as I would go (I normally reccomend no higher then 1.85v)

[spaceman]

You're right, it was @ 1.55. ;) It was kinda late when I wrote that. Thanx for confirming that for me. :) I've already heat-sinked the MOSFETs, mem-controller, and the other one near them. When I change resistors, I'm gonna heatsink the chip we're moddin', the "scary" one right by it, and put a better one on the Northbridge. I also found a Delta for the Northy, so I should be O.K. :cool: Thanx again.

[Naasar]

Originally posted by k1114
If you got 1.8vdd from a 680 ohm resistor, your starting voltage was 1.55 not 1.5! If you use a 560 ohm resistor you will get roughly 1.864v which is as high as I would go (I normally reccomend no higher then 1.85v)
i am at 1.77 to 1.79 now. i am using the vantec iceburg now and it is still quite cool to the touch. considering the sometime 41c case temps. anyhow, if i were to go to 1.85v vdd, would it still be fine for me to use the vantec or do u 1.85v guys use more hard core cooling?:stick:

[spaceman]

Well, it worked. :D Did all the small jobs listed in my last post, and the 560 ohm resistor brought me to 1.85 vdd, although it fluctuates a bit to 1.87v, so it's probly more like 1.86v. I lapped the Southbridge too this time, since it REALLY needed it, and put the copper Iceberq on it. The Northbridge now has a socket 7 heatsink, with a corner hacked off to clear my PAL 8045. I haven't tried a higher FSB yet tho, 'cause I'm getting some video corruption in games, (RTCW), that was there before I changed resistors. I was hoping the re-mod would straighten it, with a bit more juice. :confused: Anyone else seen that, or do I just need to check my vid card closer?