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Excuse my ignorance, but what is the VBT mod for? It says that it is necessary to complete the VDDR mod, so is it just so that BIOS reads the correct voltage, seeing as a couple of people have successfully dont the VDDR without doing the VBT? Seems like cuttting teaces and such is not really worth it to get BIOS to read the correct voltage...A multimeter will do fine!
Yeah, but Bushboy... if what you are saying(and what I'm asking) is correct, then you need to manually adjust this Vbt to about half of Vddr... so it's really not an accurate measurement of Vddr(using MBM or USDM or whatever). You know what I'm saying?
I know this mod has got to be doing something else(I hope), but it almost seems like it's just for the software monitoring programs... which is strange. :confused:
Oh well... I'm happy with doing just the Vddr mod. I'm going to do the Vbt mod this weekend and see if it helps 'stability' but I'm not holding my breath. ;)
Yeah been wondering about this myself since I saw it..........
What is the difference? Maybe DD can tell us.
BTW CPU.... how are you showing it in the USDM screenie? Did you do the vbt mod also?
Sorry if I missed you saying that you did.
EDIT: Last but not least... did you measure c32 and come up with the same voltage as what is pictured.
Thanks
muzz
Count me in on one of those who successfully did the mod ;) I'm not sure the exact voltage yet, but I'm quite sure it worked perfectly! Gotta give a big thank you to Jeff, with his work on both the Vddr and Vdd mod, it's great to have someone like him around here. I'll be seeing how much of a difference .3v makes with regard to FSB tomorrow...it's getting late.
Lifting a pin:
I have one experience to share with you, perhaps it might be of useful.
While I was doing a Vdd mod, I accidentally soldered a wrong pin (worked late at night). I tried to de-soldered that one out using a solder gun for a very short period of time intermittenly and tried to detach the wire out using a bit of force. Suddenly, it was not the wire that was detached. They were the wire together with a pin. After correcting my mistake, I soldered that pin back onto the PCB and it still worked OK.
If you don't want to cut the trace on the m/b, you might try this method. Use the smallest wire available. Primer the wire with solder then use soldering paste. Next solder it to the pin. Then pretend to undo the soldering work.
The datasheet from this winbond chip say the following about the functionality of the BTsen:
"Bus termination controller STR2-1.25dual for high speed bus termination to sink and drive redundant current"
Maybe someone can translate this so me can understand this to ?!! :) :rolleyes:
bye
Crozet
How do I measure the gain at Q32? Sorry, but don't quite understand the connection points to test.
Pin closest to the middle of the mobo is where you put positive( on Q32 ), case or mobo ground is neg.( Using multimeter)
Look where Jeff has the wire attached to Q32( in his pic).. thats the point for the pos. on MM.
Unless someone corrects me, thats where I saw the increase.
what about the other 2 mosfets very near (nearer) to DIMM sockets, have you tried measured thems?
I think I did, but not 100% sure...... I did see the increase on the pin stated......... didn't seem to do alot for me here, then again I only went up to 3.1 for my testing.
if you look at the trace of the mosfet Q34 and Q33, the trace looks like they are serving Vddr to DIMM as well.
if you got +3.1V (when set at 3.1V on Q32) on other pins Q34 and Q33, it appears that there are more than 1 mosfets responsible for converting the volt output.
if you got <>+3.1V, it seems that doing just Q32 mod is a job half done?
Q33 is for Vbt and Q34 is for ???.
Ok what wires do i connect to the Trace and to the Q32 using a VR do i use both hotpins(the outside pins) and leave the ground out of the equation?(thats what it looks like to me just double checking)
im going to attempt this mod tomorrow afternoon im hoping to get 235-240 5-2-2-2 stable...thatll be ultra nice :D
well modded mine last night.before max was 215 dual memory,stable prime at that.did mod now looks like i am able to run 225 dual with prime stable @ 3.05.:)
but i noticed while i was stressing ram last night i am seeing a drop to about 3.042 under load.
so maybe the second part of the mod is needed VBT mod ?
this might stablize the voltages.
also i am not sure if you guys noticed but.while i have my meter connected to the mofset measuring the dimm voltage.if i shut down in windows i can see the meter drop to no voltage like it should but.........if i disconnect the power suppy for a second.then reconnect it i can watch my memory voltage rise to 2.77 with the motherboard still off.
:rolleyes:
i dont understand that at all?when i power up the motherboard the voltages rise like they should back to 3.05.
any ideas or is that normal you think?
Connect a wire from one hot pin to the trace, and then from the ground on the VR to Q32...Using two hot pins will give you a fixed resistance always, therefore eliminating the Variable of Variable resistor ;) Make sure the hot pin you use and the ground have a resistance of 0ohms first, then turn the knob to increase.Quote:
Originally posted by WildKard
Ok what wires do i connect to the Trace and to the Q32 using a VR do i use both hotpins(the outside pins) and leave the ground out of the equation?(thats what it looks like to me just double checking)
im going to attempt this mod tomorrow afternoon im hoping to get 235-240 5-2-2-2 stable...thatll be ultra nice :D
I have 1.85v for VDD and 3.34v for Vmem
It's rock stable at 225-226 cas2 7-2-2 in DUAL DDR with 2*Corsair Pc3200 cas2
edit : 230 cas2 7-2-2 with 2 adata winbond 5ns now
vdd 1.95v
Vbt is half of Vddr. I think that it is used to terminate the bus of DDR RAM so we could use 1, 2, or 3 DIMM slots(?).
Can someone please check Vbt pin to see if it's actually half of Vddr after the mod (ie. Vddr 3.2 --> Vbt 1.6V)?
no you have to set it manually to half.with my mod if i set the memory to 3.1 the vbt only shows 1.45 which is only half of 2.9v which is the max the board thinks you can go to.Quote:
Originally posted by KS1
Vbt is half of Vddr. I think that it is used to terminate the bus of DDR RAM so we could use 1, 2, or 3 DIMM slots(?).
Can someone please check Vbt pin to see if it's actually half of Vddr after the mod (ie. Vddr 3.2 --> Vbt 1.6V)?
so you have to start off with 0 ohms and slowly turn the vr resistor untill you reach half of your memory setting.for my 3.1v setting i set the vbt to 1.55v:D
That means Vbt use data from Vsense pin to adj bus terminal voltage.
If we only do Vsense mod, Vbt is not 1/2 of Vddr.
Well, I want to do the vdimm mod, but do I have to do the vbt mod also to make it stable??
Jeff, muzz anyone: Anyone done this vbt also and shown more stablity or does this mod just show the correct vdimm in software?????
well it doesnt do anything for showing correct vdimm in softwear.Quote:
Originally posted by Jasonxxx
Well, I want to do the vdimm mod, but do I have to do the vbt mod also to make it stable??
Jeff, muzz anyone: Anyone done this vbt also and shown more stablity or does this mod just show the correct vdimm in software?????
it just stablizes the memory more like it should be.i can tell a differance under load.before mine used to drop from 3.05v while running 3d2001.( i keep a volt meter attached the the mofsets while benching) would drop from 3.05 to 2.96 or so.now it holds within a few points.3.05 -3.03.
but you wont tell this unless you have the system pushed hard.
:D
hey thanks bowman!!!!:toast:
i will complete the mod over the next few days in between work........:D
I want to be able to complete 3dmark at 230mhz fsb.......:banana: x that by 11.5.........
and get this 9700 up around 490/800 "a far cry" I will get a real good 3dmark score........
Will a 500ohm VR work???? If not what is the best one to use???