View Full Version : Vdimm UD3R Mod Help, pics i have
Hi! can i please have the Vdimm Vmod for this gigabyte UD3R board.
you know why :)
here are pics of potential mod areas, please point out !
Thanks
http://img79.imageshack.us/img79/6260/65630867zy8.jpg
http://img159.imageshack.us/img159/6790/82863679vz8.jpg
http://img384.imageshack.us/img384/6508/54466681ve0.jpg
http://img49.imageshack.us/img49/3952/16722025jt4.jpg
http://img255.imageshack.us/img255/9902/16880890eh9.jpg
celemine1Gig
12-15-2008, 06:12 AM
1.) A pic showing an overview of the board would help. ;) Just the macros are no good alone (at least for me), as I don't own the board and google doesn't really come up with good overview shots.
2.) Try to take the photos from an angle with flash enabled. This makes sure that the markings on the chips become visible in the pics (I honestly can't read much in your current set of pics).
3.) A litte trick to make the markings on a chip visible, if they are barely readable: Use a q-tip and put a little bit of white thermal paste on it. Rub that thermal paste onto the markings and then whipe it off again. Afterwards the markings should be clearly visible. :)
http://pdf1.alldatasheet.com/datasheet-pdf/view/207947/RICHTEK/RT9199.html
Theres the datasheet for the RT9199 (in the 3rd pic) Its a termination controller.
Please can you tell us whats on the 8-pin chip thats in pics 1+2? (U11)
Thanks for the PM bro :D
Its not the LM324 :) Thats a quad Op-Amp, remember them from uni :p:
6545
cbz
v8322qp
thanks for the help!
celemine1Gig
12-15-2008, 04:35 PM
6545
cbz
v8322qp
thanks for the help!
http://www.intersil.com/data/fn/FN6305.pdf
Intersil ISL6545. ;) Sorry, no time for more now. Got to attend a lecture in a few hours. Need some sleep :D
Thanks for the effort! that looks like enough info to figure out a mod, maybe k404 can help? im not THAT smart, didnt study electronics :D
much appreciated
celemine1Gig
12-16-2008, 01:18 PM
Measure resistance between Pin#3 and Pin#6 of the ISL6545 and report the findings. Then we'll talk about the trimmer poti that is needed.
Ah.....lets spill the beans :p: As Celemine said, please measure the resistance between pins 3 9GND) and 6 (Feedback.) Multiply that resistance by 20 and that will be the value of trimmer you'll need. It should be connected between those two pins.
20x the base resistance gives a good balance between small voltage boost at maximum trimmer resistance and a good amount of control of the voltage increase itself as you wind down the trimmer.
Ok dudes here is teh lowdown.
Resistance between pin 3 and 6 is 629.
That means a 12.5k Pot more or less. i only have a 20k
I popped in my 20k that was trimmed to 4.8k by default (board is not plugged in dont worry)
and it took the resistance to 580. so i think when i trim it to 20k and slowly wind down i think it will work.
Just let me know if i can go ahead :)
BTW. do i set Vdimm in bios still? or just to ALL with trimmer pot.
U guys rock
Success!! the mod is working :) THANKS
20k VR on about 5k Makes it 2.06v from a stock 1.90
So i wanted to ask , do i set Votage in bios on 3. then on real it will be .16 higher? like 3.16, or do i just leave voltage on stock and trimpot it to 3?
Cool!
Oh btw, my board didnt clear the CMOS properly and lets just say my dads cheapo one sided ddr2 survived 3.04v Air for 2 seconds :D. luckily i had a multimeter on it otherwise it would have fried. it still works though :D.
Get ready for some ddr2 damage :)
here are the working mods :)
http://img247.imageshack.us/img247/233/24479890lz3.jpg
http://img208.imageshack.us/img208/5461/63510710zh2.jpg
green wire is just to any ground you can find on the board
If you leave the trimmer at that value, the voltage will always be the same value higher than what you set in BIOS. You can still set VDIMM in BIOS, or use the trimmer...or both :) Its semi-advised to try and keep the BIOS value as close to the actual voltage you want as possible...so, if you want say...3.20 VDIMM, set the max in BIOS and use the trimmer for the rest.
:)
exciteMENT!!!!!!!!!!!
:D :D :D :D
Il be running tommorow, come on flex babies dont die on me now!
celemine1Gig
12-17-2008, 09:53 AM
Glad that it worked. BTW, you perhaps might want to have a look at this thread:
http://www.xtremesystems.org/forums/showthread.php?t=210365
Just in case you maybe want to limit the max. voltage for safety's sake. ;)
After having killed one of my best boards by accidently setting too much MCH voltage, I'm now convinced that it's really worth the extra time and the one extra resistor. :D
Ooh i think i see what you mean.
So at the moment it is 1.9v and potted to 2.06v. (1.9+0.106, a percentage (rise) of 8.4%)
but it wouldnt necaseraly mean 3v + 0.106, it could be increasing voltage exponentially with the higher the bios voltages go?
meaning 3v + (8.4) % of 3v. i could be VERY wrong im not as smart as you guys
Try changing values values from say...1.80V, 2.00V, 2.20V etc. It *should* be a set voltage difference between BIOS and actual for any situation if only the BIOS is changed.
The existing feedback model for VDIMM has worked fine for years, no special reason to change it now, but tried + tested ideas Vs reality dont always match so better safe than sorry
Ooh i think i see what you mean.
So at the moment it is 1.9v and potted to 2.06v. (1.9+0.106, a percentage (rise) of 8.4%)
but it wouldnt necaseraly mean 3v + 0.106, it could be increasing voltage exponentially with the higher the bios voltages go?
meaning 3v + (8.4) % of 3v. i could be VERY wrong im not as smart as you guys
Corrected, some decimal points in the wrong places :)
thanks, indeed i cannot make mistakes in a voltmod thread, people might think something strange. corrected with your quote
Hondacity
11-03-2011, 05:11 PM
thanks for the mod :D