BD7(II) vdimm mod?

[DDTUNG]

Originally posted by OneProdigy
Finally here it is!

location of the W83301R regulator


affected pins


added resistors (or pots)


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

[OneProdigy]

YESYESYES!!!

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!

[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

[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!

[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.






Winbond BH5 @ 220Mhz CL2-3-3-6 @2.9V

[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

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 to connect the wire to the PIN, and a 3-PIN Fan Connector to connect the trimer to the GROUND (BLACK cable).


Here are two shots of the SMD Grabber:
SMD Grabber
SMD Grabber on-chip

[AndrOvr]

Here's that chip on the BD7 II?
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 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