I prefer changing the resistance on switched off system. Just for safety - my friend burnt his mobo, not 9nda3+, because he used to change everything "on the fly" and at one time his resistor suddenly burnt, you can imagine what happened next....
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I prefer changing the resistance on switched off system. Just for safety - my friend burnt his mobo, not 9nda3+, because he used to change everything "on the fly" and at one time his resistor suddenly burnt, you can imagine what happened next....
On the first page there is a pic who clearly shows you what to do!! there stands: use a 25k or 50k pot! now you say you have a 50k pot so use that one, I used a 20k pot for the mod and it works too, the only difference is that you can't tune it that fine!Quote:
Originally Posted by AMDfan
@Adasi: thx for the tip! I alsow adjust it on the fly because when you shut the system down and adjust the vdimm, you can't read it accuraty, it's always lower!
And maybe a tip for you AMDfan, solder a molex connector to the vdimm readout point a put a multimeter in it, it's quite handy to read the vdimm and more safe for not shortcicuiting the board!
I actually always adjust on the fly too, but I buy some nice quality vr's for stuff like this. And actually, a lower resistance VR gives finer tuning, it just gives you a higher start off bump. (50k/15 turn = 3.33 kOhm/turn, 10k/15 turn = 666.6 Ohm/turn, less Ohm's per turn = more precision)
Good advice on the Molex too. I just clip a wire in there, with the end of it stripped and tinned and use the aligator clip attachment on my meter to clip onto it, ground from the case. Lets you read while you tune without having to turn, poke, turn some more, poke again, etc. Just watch and make sure you never ground that wire end, lol, that would be bad. ;)
a molex is safer than your wires :)Quote:
Originally Posted by mikead_99
thx for the clearup mikeadd, i'm no electrician and so i tought the more resistance/turn you had the more you could tune!
Thanks alot for your Advice on the molex, :toast: one more little thing, about Vcore&droop moded, as you can see in this picture, The mod was done with a Board doesn't have the same Vcore controller, as mine, :( My board is a Rev.1, so I can't really do exactly the same moded in this picture, and I'm not sure about witch controller should be Mod on my board, anyone know where I can get a picture of Vcore&droop mode that have the sameboard as mine (Epox 9NDA+Rev.1) Or I can post a picture of mine board, so someone can show me where and witch controller and witch legs should be solder, please let me know if sommeone can help me out . Again I'm verry appreciated it :toast:Quote:
Originally Posted by Da_BoKa
http://img20.exs.cx/img20/6964/ep9nd...roopmod0ng.jpg
Hey All, my first time over here. First of all, sweeeet forums you guys got here. Now, for my question.
I just bought this board and I am going to do the vdimm mod on it, but I was wondering.....
You all keep talking about the voltage read points to read the voltages. With the vold mod, will the readings on bios be accurate still? Will the voltage actually be DIFFERENT than what they are reading after the mod is done? Thanks!
-Collin-
If you want to know the exactly voltage of your Vdimm mod, then you should use the Digital Multimetter, you will see the real voltage of your Vdimm, :toast:Quote:
Originally Posted by NinjaZX6R
I don't know if i did missed it but I din't see any Vcore read point in this thread. anyone know where's that Vcore reading point ? :confused:
I just got this board. The vdimm mod is dead easy!!! Thanks guys :)
Someone earlier in the thread mentioned about how you dont have to solder directly to the chips leg. This is also true and confirmed. Just below the chip there's 6 solder pads, stick the multimeter on the chips pin and touch it with the pads till it beeps (well, mine has a setting that beeps anyway) and solder to that instead. Less risky :)
Is there a VTT mod? What does VTT actually do? Because I have been reading about A64 memory controller deaths with high vdimm, I thought maybe this was actually related to VTT. 2.7v / 2 = 1.35v through the memory controller, 3.3v / 2 = 1.60v through the memory controller. If it's as flakey as it's supposed to be, perhaps this is the cause?? I know absolutely nothing about volt modding, so this is almost certainly wrong. But, you know, sounds like a possible cause to me?
If I buy OCZ VX PC4000 will the vdimm mod be apropriate to give the ram enough voltage to get good latency timings 8^)?
I'm planing to do this mod on my Epox 9NDA3+ rev.1
I'd like to put a resistor, behind a 20k pot 10 to 20 turn, that keep voltage at 3.6 in case the pot don't work or is set to 0k.
I wannt to keep safe when I solder all that. When I would have buy the pot I will not know if the pot is set to 20k or 0k :( My PC run 24/7 so I don't whant the ram to take 5v if the pot die :)
So my problem is that I don't know what resistor I should use to keep at 3.6v, I know that a 3k give 3.2-3.3v but that's all. I'm not sure with the calculation and do not whant to frie the board. So if anyone know.
What kind of pot/resistor our guy have been using 0.5W, 0.1W ?
Another thing that I whant to know is where to put the third leg of the pot ? Does a pot work similary in each way ? :confused:
@mikead_99:
I wannt to put 3.6v well, but my computer run 24/7 so I'm a bit worry about it's lifetime. is your mobo still OK ? what rev is it ?
Thanks
EDIT: @ReTiCuLeX yes 3.6v is just what you need :banana: , but it's kind of scary thought :rolleyes:
About the 3 legs the midle one is Positive, and the others two legs are GroundQuote:
Originally Posted by KoNiaK
0.05w will be fine ! and you should use the VR 50k it more save than 22k :toast: (Less K more V, less V more K) is simple :rolleyes: :banana:
Thanks for your answer AMDfan, but if I chose a 50k with 10 to 20 turns I will be less precise than 20k. And 20k seams to be able to bring voltage down near stock. So it's good enough for me :DQuote:
Originally Posted by AMDfan
Sory to ask so dum questions but it's my first mod. About the leg, the two ground ones have to be solder to the chip, but I can't see well on any photos where the positive one must go.
Thanks for your help.
KoNiaK: My mobo is still fine after running 3.6V for about 1 month straight. I already moved on to a pci-e board, so unfortunately I didn't run it much longer to help your confidence, but I'm sure it would go indefinately.
Regarding the pot legs, you are only using 2. You can use either the first and middle, or last and middle, as long as you start with the resistance between the 2 you use at max before installing. Which pair you choose depends on which way you want to turn the pot to increase VDimm. (Play with the pot and an Ohm meter, you'll see what I mean.) You can ground the unused leg if you wish, but it isn't necessary. Also, there is no positive or negative on a vr, the middle leg is on the wiper, the arm that moves along the internal resistance. The 2 outside legs are on opposite sides of the internal resistance, so when the arm is moving away from one, resistance increases, and it is moving closer to the other, so resistance decreases on that side. If for example, you use leg 1 and 2 for your mod, either 1 or 2 can go to the "hot" pin on the chip and the other to ground...no polarity for resistors. Oh, and .5W should be fine...I actually use 3/4 W myself but you aren't really dumping any real current so 1/2 W will work.
edit to add: Also, I'm not sure what value to use as a 2nd resistor for safety net. It's a good idea, but just keep a dmm on the VDimm while adjusting and you won't get the single VR set to 0 Ohms on accident.
Hi KoNiaKQuote:
Originally Posted by KoNiaK
with pot and resistor you could use this one for rev 1.1
v/core mod rev 1.1 by Polygon
Is not very simple by soldering, but it works.
That are varoius mods. Only with diffrent K ohm resistors and one
with resistor and pot.
I forgot to subscribe to this thread, I thought there was no answer yet.
I bought a 20k pot 50turn, I took a 1/2W they had only this but reading your answer I was lucky. I'll do the mod soon, with out the resistor. Thanks mikead_99
Polli> Hi polli nice to see someone from Rebels Haven here. For now I'll do the Vdimm mod, I'll see later for the VCore mod.
Thanks you.
Hi KoNiaK
if you have an rev. 2.1 mainbord try the mod by Kyosen.
In Rebels Haven we have so far only one for rev. 1.1
The mainbords have diffrent kind of of pwn chipsets
rev. 2.1 is PWN chipset SC2643VX
I have one an suggestion by connecting pin 10 to 20 (FB to GNd)
with an pot 50K to start.
You need an multimeter for measuring the actuall vcore
between FB to GNd.
Soldering on legs of chipset SC2643VX is not easy. This chipset if
very small. Maybe precision grabblers are an alternative to use.
Due to it is complicated I use also the Kyosen mod, by using
an fix 220k resistor instead a pot. Gives me round about 0,12 v more
vdimm to max 1,72 v.
But I wondering why the vcore mod works.
R278 is no 560K restistor it is capacitor.
replacing an capacitor with an pot or resistor is a little bit curious. :D
What the hell, it works.
I already got the 20k 50 turn pot, so I'm gonna use it :D
My mobo is rev1 so I'll do Either this one :
http://www.lejabeach.com/Epox/9nda3p...121204-04a.jpg
or this one :
http://membres.lycos.fr/m4darknico/CIMG0425.JPG
But I have a little problem with the last :/
First I'm not sure that it is for rev1 (EDIT after rereading the thread I found that rev1 & 2 Vdimm mod are the same)
And secondly where should I take ground on the mobo for the middle leg of the pot and for a molex to read Vdim ? Mounting holes are not great since after soldering two cables it isn't easy to screw the mobo.
If there is a more apropriate spot let me know.
There seams to be two VDimm mesurment point :
http://www.lejabeach.com/Epox/9nda3p...121204-05a.jpg
http://membres.lycos.fr/m4darknico/V...%20(Small).jpg
I got ~0.15v difference between the two readings, which one should I trust and solder my molex on ?
EDIT: I wont use precision grabblers since I don't have some and I wannt the mod to stay definitively :D
Is your mobo still running ? which voltage ? 24/7 ?
Hi KoNiaK
First picture of vdimm mod is for me well known.
This is picture by Polygon. One of his first mods.
My vdimm mod bases on the same.
http://www.rhcf.com/sis-bin/ultimate...ic/38/19.html?
First he started with some diffrent kind resistors.
The final vers. is mod with restistor and pot
this picture: http://www.lejabeach.com/sisubb/ep9nda3122704-05.jpg
pic. of my mainboard, unfurtunately smaller one, looks diffrent, but is
the same:
http://home.arcor.de/j.pollak/vdimm-mod3big.jpg
mod viewable: http://membres.lycos.fr/m4darknico/CIMG0425.JPG
I have never seen before.
vcore mod. rev. 1.1. you have is here:
http://www.rhcf.com/sisubb/ultimateb...pic/38/11.html
PWN controller is ISL6559
your posted complet mainbord picture is an rev. 1.1 board
with voltage controller chip ISL6559
Also here started Polygon with some diffrent kind resistors.
The final vers. is mod with restistor and pot
Thanks polli, I did the mod using mounting hole as GND. I found answers to my questions on another forum.
Regarding Vdimm reading Polygon got the right spot, at least on my board.
So is your mobo still running ? which voltage ? 24/7 ?
vdimm is round about max 3,35 volts.
But I never tryed so much on my G.Skill memory
vcore with the first one original bios increase to 0,11 volts with the mod
max 1,71 volts
the newest Epox Bios enables 1,75 volt also for an A64 Winchester CPU
on rev. 2.1 boards. So I have now a new max of 1,86 volts vcore.
Normaly no one do not need anymore an vcore mod on rev. 2.1
mainboards. Bios selectable 1,75 V are enough.
I'm not a overclocker to do CPU barbecue :D
The A64 3500 was'nt so cheep.
I ask Polygon, as per his info the bios 1,75 volts option is for
him only viewable for A64 FX not for a Winni. He has also the newest bios
installed. This must be a diffrent between rev. 1.1 and 2.1 also.
Maybe an result, due to diffrent kind pwn voltage controllers.
OK thx, my Vdimm max around 4v I didn't put any resitor :D
hey all..
well, i've just finished the VDimm MOD on my 9NDA3+
at the moment (according to BIOS) its running at 2.94v...i found that even when set to 2.8v in the BIOS it would read around 2.75v, im not sure if the board was undervolting or not reading the voltage correctly (does this with ALL other voltages... so i assume its reading a little lower)
so, i think its running a little closer to 3.0v...
i am running a 3800, with 2x512mb PC3200 OCZ EL Plat Rev2....previously, i was unable to run at 2-2-2-5 @ DDR400 with DC...i am running that right now and it SEEMS to be stable...keep in mind, this is about 10mins after i unplugged my soldering iron :p
I've just completed the vdimm mod on my EpoX 9NDA3J ver.2.1 with a 10kOhm resistor. It's very simple, and works great. The voltage regulator is: RT9202. BIOS volts are 2,91.......real: 2,98-3,01V.
arrg sorry about the lost images. I forgot and let my hosting run out and lost the images in a format some months ago.