BD7(II) vdimm mod?

[john433i]

Hi, I've been trying to figure out how to get some more voltage from this board, since my memory is currently holding me back from getting my 1.6A past 2.94GHz:) DDTUNG, are you getting oppainter's BD7-II? If you are, could you check out the possibility of a memory voltage mod sometime? Thanks.

[Neptune5k]

Well, I'm looking into a P4 setup and the lack of vmods are quite a holdup. I was looking at pics of the BD7II today, and to me, the following chip looks like its the most likely canditate for vMem controlling. If one of you have this board, please post the Chip's Part number so that we can look at a schematic of it.

[Darius]

from what I could see (and not very well since i was trying to check this while the computer was on and cant find a torch :/ its:

ICC7LCK
LM324

[DDTUNG]

That's the National Semiconductor LM324M quad op-amp. I am working on the Vcore and Vmem mods for this board at the moment. Hope to have results for you soon. :)

DDTUNG:cool:

[Aequitus]

:banana:

/me monitors thread 24/7 :D

Cheers DDTUNG

[Firehawk]

Me too :)

That chip in my BD7II says:

15CJ4JK
LM 324

[Neptune5k]

I'll look for a schematic this evening, DDTung, if you already have it - do you mind sending it to me?

[Aequitus]

sleeeeeepy.... soooo sleeeepy.

[Tony]

cmon guys I rearly do need to mod this board,im stuck at 224fsb mem and I know its good for over 230.

[Firehawk]

Duh.... no good news then?

[Firehawk]

Please, PLEASE!!!!
did I mention please before?

damn... where is my solder iron... is somewhere here....

[john433i]

Any update on the mod:) ? I know my Crucial can take around 180MHz with max timings if I can get around 3.2v. I don't have the money now to get an IT7, and I'm waiting for Samsung to release PC3200, so a free performance increase would be encouraging.

[ISS1]

I think I have found the vdimm controller IC. Its the Winbond W83301R IC.

[DDTUNG]

Do you have the data sheets for the WINBOND chip? Send it to me and I'll work on the mod.

DDTUNG:cool:

[ISS1]

This is what I have got from Winbond's website.

http://www.winbond.com/e-winbondhtm/partner/b_2_d_9.htm

You need to download the Traditional Chinese font pack from Adobe's website to view it though. There are no Chinese characters but I guess some of the symbols/tables they used are not supported.

[ISS1]

I have taken this picture from HardOCP. It shows the location of the Winbond chip.

http://homex.coolconnect.com/member4/ISS15/pic2.JPG

[ns_ripper]

I also want to know this one. has anyone did this mod already?

I can't find any mod for this mobo :(

[DDTUNG]

I've checked out the data sheets of the Winbond chip and have an idea how to do the Vmem mod. However, I believe it would involve cutting one leg(STRsen1 or pin 19) of the IC or the trace connected to it and soldering a VR to the two ends. Any brave soul who wants to try it can PM me for details.

DDTUNG:cool:

[Mentaly]

Hi all

Has anyone tried it yet :) wanna now cause im the soon owner of a board like it ;D ??


Menty

[ns_ripper]

hmz, it's taking long .... :(

[DDTUNG]

Just now I tried to look for the details of the Vmem mod which I sent to ISS1 by PM a couple of days ago but couldn't find it, so I am not sure if I actually sent it to him. But basically here's what I gathered from available information:

The Winbond W83301R IC, which I believe controls Vmem, is operating in mode B(see data sheets for IC for details). STR1 is the output that gives 2.5, 2.6, or 2.7V to the Vmem based on VSET0 and VSET1 selected in bios. To increase Vmem, we have to play with STR1sense(pin 19) which unfortunately is connected directly to the output, that means we have to cut pin 19 or the trace it is connected to, and solder a VR between the cut ends.

This gets a little delicate and is not for everyone. I believe it will work if done properly, but do be careful.

DDTUNG:cool:

[Mentaly]

Hi all

DDTUNG how big a resistor ar ewe talking about, I`m willing to try it out :)


Menty

[DDTUNG]

I would expect a 50k set initially to maximum should be quite safe.

DDTUNG:cool:

[Mentaly]

Hi DDtung

thnx ill try it when the board get`s here, do you have a link to the schematics of the controller, so I can see the leg i have to cut and solder to.



Menty:)

[DDTUNG]

You can download the data sheets from the Winbond site.

DDTUNG:cool:

[Neptune5k]

I've got an old, dead AK31 here that uses a similar Winbond chip to control the memory voltage, W83601R, and surgury of this size will be difficult. I'm sure i can do the soldering, but I could use a suggestion on how to snip the 19'th pin in half...

-Nep

[Neptune5k]

Just answered my own question... this should work for you too, Mentaly.

The pins are very thin, so using a fine blade, like an exacto-knife, you can carefully "saw" through them. If you cut it at the center, you can then pry the top half up a bit, which should allow you some extra room to solder. Soldering the bottom half of the pin will be tricky, very tricky, but it can be done.

I'll try to mess with it later, to see if i can do it - 47k Pot ought to do it, right DDTung?

[ns_ripper]

are we already getting somewhere? ;)

has anyone tested it already with succes? I can't wait to mod mine. :D :banana:

[Dracula]

Anyone try this yet?
DOes it work?

[Mentaly]

Hi all



Well the board should be here soon, then ill try it out :)
and a p4 2.53.

Menty

[Mentaly]

Hi all


Well Neptune have you tried it yet, and if, how did it go ??? :)
I´m still waiting for my rma BD7 II :(.


Menty

[will_perdikakis]

Anyone have any sucess with the mod yet.

My brand new BD7 is itching for it. :)

One more thing that I do not quite understand DDT. How does adding a resistor in series increase O/P voltage potential?

[DDTUNG]

The STR1sense pin is connected directly to the output, so in order to trigger the error amplifier you have to create a voltage drop between the output and the pin, hence the resistor in series.

I must stress that this mod is untested, and at this point is no more than an educated guess.

DDTUNG:cool:

[will_perdikakis]

Ok, error amplifier. :p

Does the error ampliflier work in a range, like analoug? Or is it purely digital? And if so, What will the resultant Vmem be through that range?

So basically the voltage is monitored at pin19 and at the O/P, if a voltage decrease is detected the error amplifier kicks in and attempts to rescue the declining output. How safe is it to run it like this all day?

Please excuse the questions, I am still in the theory part of my EE degree. :p

I will test the mod for you DDT. I will let you know through PMs and upload piccies.

The one thing I do not like, is the fact that the mod will be very, very fragile.

I thought XS had a blue law about untested mods.... :)

[DDTUNG]

The appropriate health warnings have been issued in this case.:D

DDTUNG:cool:

[OneProdigy]

Hi all!

I've been searching the internet up and down for this vdimm-mod until i found this forum. ;)
Any success yet? :rolleyes:

[Ragnarok]

come on guys :).. undervolting vdimm on this board is driving me nuts!

[AndrOvr]

Anyone? :rolleyes:

[dr_muller]

I'm sorry if this is a little OT, but i just received my BD7II and radeon 9700. Problem is my I/O voltage isn't stable. It jumps between 2.6-3.8v at worst. Don't seem to be OC related, problem remains when everything is on default.

Anyone know about BD7II+9700 problems?

And please! Come up with a clever vdimm mod. My Corsair 3200 cl2 hardly reaches 220 mhz at 2.7 volts. They want more!

[will_perdikakis]

Ok, well the mod is very much not practical for everyday usage. Nor is it easy to perform.

My decision is to "upgrade" to a IT7 Max2.

[OneProdigy]

So...how much vdimm can u get with an IT7 Max2?

EDIT: I found it...it's 2.8v :(

So you suggest to buy a new mainboard because of only 0.1v more vdim?

If there was a vmem mod for the IT7 Max2 and i would be able to get around 3.2v... then i would probably think about getting an IT7 Max2... but not for only 0.1v more!!! :rolleyes:
But as far as i know noone came out with a vmem mod for Abit's IT7 Max2... :(

So it seems i'll have to wait till some tough guys manage to mod the BD7II...*yawn*

[john433i]

Originally posted by OneProdigy
So...how much vdimm can u get with an IT7 Max2?

EDIT: I found it...it's 2.8v :(

So you suggest to buy a new mainboard because of only 0.1v more vdim?

If there was a vmem mod for the IT7 Max2 and i would be able to get around 3.2v... then i would probably think about getting an IT7 Max2... but not for only 0.1v more!!! :rolleyes:
But as far as i know noone came out with a vmem mod for Abit's IT7 Max2... :(

So it seems i'll have to wait till some tough guys manage to mod the BD7II...*yawn*

As far as I know there is a modified bios for the IT7-2 which allows up to 3.2v. You can contact PiLsY for it. Here's (http://www.xtremesystems.org/forums/showthread.php?s=&threadid=3183) the thread in which the bios is discussed.

[OneProdigy]

Got some good news for all of you waiting for the BD7-II's vmem mod!

I'm currently working together on this issue with a guy from finland - it ssems he's pretty skilled in mods of this kind ;)

Maybe i can tell u more by mid next week...i'll keep you postet!

[AndrOvr]

Cool!
Cant wait to mod mine :)

[GreenBeret]

Originally posted by OneProdigy
Got some good news for all of you waiting for the BD7-II's vmem mod!

I'm currently working together on this issue with a guy from finland - it ssems he's pretty skilled in mods of this kind ;)

Maybe i can tell u more by mid next week...i'll keep you postet!

Excellent ! I can't wait :) 2.67 Vdimm is pathetic :(

[eva2000]

would be nice my BD7-II undervolts vdimm to 2.61v when set at 2.7v :(

[AndrOvr]

OneProdigy

Any luck yet?

[OneProdigy]

not yet, but we're still at it! ;)

[OneProdigy]

Finally here it is! :banana:

location of the W83301R regulator
http://home.t-online.de/home/320072397750-0001/Regulator_location.jpg

added resistors (or pots)
http://home.t-online.de/home/320072397750-0001/vmod-chip2.jpg

If you have a look at the pics there are 2 resistors (R1, R2) added to pin 19 of the W83301R regulator.
(R1+R2)/R2 should give new voltage. If R1 = 100 ohms and R2 = 10 ohms then it gives a 10% increase and 1.1 x 2.5V = 2.75V and 1.1 x 2.7V = 2.97V!
Details were added to the pic above.

Like DDTUNG mentioned before this mod includes cutting pin 19 of the W83301R regulator!
Most sure way to do the mod is connecting resistors directly to the W83301R chip's leg no 19. Desolder leg from the mobo (heat with solderingiron and pry it up with needle or something).
Look where the trace is going and solder 10 ohms resistor from original trace to the chip's leg. 100 ohms pot goes from chip's leg to ground.

The credits for this mod go to Jarmo Pirinen who did a great job helping me to figure out how this mod is to be done! Thanx again, Jarmo! :)

Be aware that like any other modification to hardware you'll loose waranty if doing this mod!
Furthermore i'm not responsible for any damage this mod might cause to your hardware! ;)

I didn't have time to mod my BD7-II Raid yet, but i'm pretty sure it'll work - but it's still untested!
This post is for any of you who can't wait till i modded my board to validate this mod is working properly. ;)

Good luck!

[Ragnarok]

holy öööö :) bit late though

just changed to IT7 :P

[DDTUNG]

Originally posted by OneProdigy
Finally here it is! :banana:

location of the W83301R regulator
http://home.t-online.de/home/320072397750-0001/Regulator_location.jpg

affected pins
http://home.t-online.de/home/320072397750-0001/vmod-chip.jpg

added resistors (or pots)
http://home.t-online.de/home/320072397750-0001/vmod-chip2.jpg

If you have a look at the pics there are 2 resistors (R1, R2) added to pin 19 of the W83301R regulator.
(R1+R2)/R2 should give new voltage. If R1 = 10 ohms and R2 = 100 ohms then it should give 10% increase and 1.1 x 2.5V = 2.75V and 1.1 x 2.7V = 2.97V!
If you decide to use R1 = 20 Ohms and R2 = 100 Ohms, you'll get 1.2 x 2.7V = 3.24V which should be sufficient for extreme memory overclocking. ;)

Like DDTUNG mentioned before this mod includes cutting pin 19 of the W83301R regulator!
Most sure way to do the mod is connecting resistors directly to the W83301R chip's leg no 19. Desolder leg from the mobo (heat with solderingiron and pry it up with needle or something).
Look where the trace is going and solder 10 ohms resistor from original trace to the chip's leg. 100 ohms resistor goes from chip's leg to ground (pin 5 or similar).

The credits for this mod go to Jarmo Pirinen who did a great job helping me to figure out how this mod is to be done! Thanx again, Jarmo! :)

Be aware that like any other modification to hardware you'll loose waranty if doing this mod!
Furthermore i'm not responsible for any damage this mod might cause to your hardware! ;)

I didn't have time to mod my BD7-II Raid yet, but i'm pretty sure it'll work - but it's still untested!
This post is for any of you who can't wait till i modded my board to validate this mod is working properly. ;)

Good luck!

Jarmo showed me my first Vmod ever on the ASUS A7M266. :)

DDTUNG:cool:

[OneProdigy]

YESYESYES!!! :toast: :toast: :toast:

Believe me...i'm not very skilled at soldering but it worked...first try -> SUCCESS! :)
(the only thing i soldered before was a simple fan bus 12/0/7V)
It took me about one hour cause its really damn small!

1. Important: First set voltage in bios to 2.5V!!!!
2. Desolder pin19 from mainboard and pry it up a bit (i used a needle and a thin solder iron)
3. solder 2 wires to pin19
--->one to a 100 ohms pot which goes to ground (case or mainboard fixing holes)
--->and the other to a 10 ohms fixed resistor which goes back to the point where pin19 originally was connected.

That's it!

It's tricky i know and you have to decide on your own if you're able to do it or not...

Here Is a screenshot i took when i started this post @2.90V
vmem is set to 2.5V in bios -> at 2.7V i get 3.1V out of it!
http://home.t-online.de/home/320072397750-0001/vmem_mod_full.JPG

[AndrOvr]

KooL!

V nice.. now.. I will mod mine soon :)
Do u have any digy cam so u could take a pic..

[OneProdigy]

i'll try to get a digicam tomorrow ;)

[Erazer]

Hi OneProdigy,
will a fixed resistor work and if so what value do you recommend? (I noticed you said that a 10ohm in one of your earlier post)

[OneProdigy]

I used a 100 ohms fixed resistor from pin19 to ground (mainboard fixing hole) and a 50 ohms pot from pin19 to the trace of pin19! (where pin19 was desoldered from)
-> This is the tricky part about this mod - you need a very thin soldering iron for desoldering pin 19 and soldering a cable to the trace!

Here is a small table to show the relation between pot, bios settings and real vmem:

EDIT:
R1-pot(ohms)....bios settings...........real vmem
100....................2.5V....................... .2.75V ((10+100)/100)*2.5
100....................2.6V....................... .2.86V
100....................2.7V....................... .2.97V
80......................2.5V...................... ..2.81V
80......................2.6V...................... ..2.93V ((10+80)/80)*2.6
80......................2.7V...................... ..3.04V
70......................2.5V...................... ..2.85V
70......................2.6V...................... ..2.97V
70......................2.7V...................... ..3.09V ((10+70)/70)*2.7
50......................2.5V...................... ..3.0V
50......................2.6V...................... ..3.12V
50......................2.7V...................... ..3.24V

Good luck! ;)

(I didn't get a digicam yet...hope to get one on monday)

[Jarmo]

Clad that you got it working :-)

20 ohms fixed resistor is max. that I suggest. Going over 3.15V does not help in many cases and usually 3.05-3.1V is enough.

[DDTUNG]

Originally posted by Jarmo
Clad that you got it working :-)

20 ohms fixed resistor is max. that I suggest. Going over 3.15V does not help in many cases and usually 3.05-3.1V is enough.

Jarmo, welcome to Xtreme!

As I stated earlier, your help with the A7M266 Vcore, Vio, and Vmem mods a long time ago got me started in Vmodding. Thanks again.

We have a whole section of the forums devoted to Vmodding. Hope you will stop by often to share your knowledge and expertise with us.

DDTUNG:cool:

[OneProdigy]

I recievd a mail from Jarmo 10 minutes ago...

He recommends to use a 100ohms pot and a 10 ohms fixed resistor!

Here is the mail i recieved:

hi

Good work!!

Be careful with that potentiometer. If that pot breaks or has poor
connection then memory can get full voltage (if it is 5V then it could
burn). It is safer to put 10 ohms fixed resistor to R1 and pot as R2,
then if pot breaks it won't break anything else.


Jarmo

Thanx for the hint, Jarmo! ;)

BECAUSE OF THIS HINT I HAD TO EDIT SOME OF MY EARLIER POSTS! JUST HAVE A LOOK AT THIS NEW SCEMATIC FOR THE CHANGES!
http://home.t-online.de/home/320072397750-0001/vmod-chip2.jpg

[john433i]

Does anyone know how to measure the actual memory voltage on the original BD7? The BD7 doesn't have support for reading Vmem through BIOS or software, so I'd like to be able to monitor my voltage, especially if I was to use a potentiometer instead of a fixed resistor. BTW, thanks for the info on the mod!

[OneProdigy]

What about Motherboard monitor?
Did you already try that util?

[john433i]

Originally posted by OneProdigy
What about Motherboard monitor?
Did you already try that util?

Yeah I've tried that. I know that Abit didn't have a mem voltage sensor onboard until the BD7-II, so there must be some way I can measure the voltage with a multimeter. I doubt the mod will do much for me anyway though, as the BD7 series seems to have some problrms with Corsair Winbond based DDR at frequencies around or in excess of 200MHz. I'd still like to perform the mod though, as I'm sure I can squeeze some tigher timings out of this 3200C2 at around 180MHz.

[OneProdigy]

Here are some pics.

http://home.t-online.de/home/320072397750-0001/105-0554_IMG.JPG
http://home.t-online.de/home/320072397750-0001/105-0555_IMG.JPG
http://home.t-online.de/home/320072397750-0001/105-0561_IMG.JPG
http://home.t-online.de/home/320072397750-0001/105-0562_IMG.JPG

Winbond BH5 @ 220Mhz CL2-3-3-6 @2.9V
http://home.t-online.de/home/320072397750-0001/SiSoft_220FSB.JPG

[PIRATA!]

Hi!
I have found that this hardware Vmem MOD works quite the same in every ABIT mobos.
Here is the chip serponsable of the Vmem:

HIP6521 (http://space.tin.it/computer/mcighera/data/hardware/abit/HIP6521.gif)

PIN-3 FB is the one to connect to a 4 KOhm trimer. Then connect the trimer to a GROUND of the mobo.

I prefere not to solder wires to a so little chip like the HIP6521 and on components or materials connected onboard, so I will use a SMD Grabber (http://www.elexp.com/clp_5243.htm) to connect the wire to the PIN, and a 3-PIN Fan Connector (http://space.tin.it/computer/mcighera/data/hardware/abit/3-PINFanConnector.jpg) to connect the trimer to the GROUND (BLACK cable).


Here are two shots of the SMD Grabber:
SMD Grabber (http://space.tin.it/computer/mcighera/data/hardware/abit/SMDGrabber.jpg)
SMD Grabber on-chip (http://space.tin.it/computer/mcighera/data/hardware/abit/SMDGrabber_onchip.jpg)

[AndrOvr]

Here's that chip on the BD7 II? :rolleyes:
Any pics w the mobo modded that way?

[PIRATA!]

I have finished building the VoltageMODderWiRe (great name... isnt' it? hehe!! :)) about a few minutes ago.

I whent then to find the chip, but I havn't found it.
I thought that the chip responsable for the Vmem was exactly where was signed (http://www.xtremesystems.org/forums/attachment.php?postid=17233) by Neptune5k in the first page.

Is the chip posted by OneProdigy instead the only one responsable in Vmem mod???

Please let me know this right. I am becoming mad about this, and desoldering a PIN of a chip is not quite what I was looking for.

[toofast]

Forgive my noobness but where does the 10k fixed resistor fix to again?

[Lisch]

i cant believe i pulled it off!!

vdimm moded my abit BE7-raid...

took about an hour, i missed it the first two times but then it worked after resoldering.. i accidentally pried up pins 19 AND 20 so i had to resolder pin 20 back down :(

hardes mode i ever did... the radeon vmodes for core and mem were way easier i think..

[Lisch]

my rig...

P4 2.66 C1 @ ~3.5Ghz, Abit BE7-Raid
1GB Corsair xms pc3200
9700Pro @420/702 watercooled/TEC MCW-50T on its own circuit
Audigy DVD DigiDoc 5
VAPOCHILL PE in LianLi PC71
2 IBM GXP75'S In RAID 0
Antec TruePower 550
XP PRO


http://lisch.no-ip.com for pics

[coldshock]

This is amazing-I've been looking for this forever. Nice to see people that know their stuff again