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Im going to do some testing with the release BIOS over the next 15 min or so.
You might have interest in this thread as well. http://www.ocforums.com/showthread.php?threadid=266442
I need to get at least 3.1V on my memory. BTW what processor and what max FSB are you able to achieve? I can get 290 stable and 292 is not stable, anything above that wont POST. My spec is stated previously above in another POST also.
Ok,
I went back to the release BIOS which allows for 3.3V in the BIOS. At 3.3V with the mod turned down I only get 2.97V as read by the BIOS and 2.99 as read on the mosfet by multi-meter. Then at 3.3 in the BIOS with mod all the way on *0 Ohms I still only get 2.99 - 3.0V. I'm just stuck here.
I need some help with connecting the 3.3V rail directly somewhere to the mosfet or something then dropping it with some diodes or something down to get better vdimm. Perhaps Malves has some input there or hipro5 if he can be found.
lets PM malves again i guess
my mushkin black lvl2 will crash boot into windows at 250fsb at 3.09volts...
im running a 2.4c currrently at 3.3ghz stock cooling/volts (5:4)
Have you guys tried checking vdimm on other FETs?
no i haven't, but both pchealth stats, and the onboard monitoring program display it as 3.04, multimeter as 3.09
Tactical,
Can you take readings on your board for the point #3 shown in the pic on the first page of this thread post #3?
my #3 is now 3.11
Yes, gimme a few minutes
3.02V
Like I thought. The mod works, but something is limiting the voltage to the FET. That's why you got 3v and and solo about 3.09-3.1v. Gotta find out what.
I have spent several hours looking at this and have come to some conclusions. The mod we performed raised the emitter voltage on the second mosfet. The last mosfet emitter is tied to the 12V rail. The second mosfet with the mod defaults to about 5.5V or so on the emitter as controlled by the LM324. The first mosfet is also fed by the LM324 and has about 5.4V as well. With the mod activated and the POT at 0 Ohms it has about 11V or so on it. I believe that we need to mod the 3rd amp on the LM324 as well to achieve the remaining voltage. This pin would be pin 9 on the LM324.
I will test this within a few hours or so.
Whoops,
I was very tired last night when I was staring at my board and measuring. We need to mod pin 13 for the 4th amp in the LM324. I will do this now. Hopefully it will work to return to say what happened. If you guys dont hear from me from here then you know what heppened. :) rma baby
lol
ok,
Im still here, I connected pin 13 in parallel with the other mod to the same POT which did not let my system POST. I dont know if it wouldnt work in parallel like that 2 mods off 1 POT or just it wont work. I done for a little while. I have messed up two traces near my LM324 and I dont want to risk permanent damage till I see what you all have to say.
My system BTW is attached to a Prommy MachII and I have been soldering with it standing up vertically. LOL its a pain to turn it over but I guess I need to so I dont mess it up further.
I have a suggestion, but not sure if it will work. You have 4 options here:
1. Raise pin 13 of LM324 and solder it to that FET leg where the trace goes, via a 200 ohms trimmer set at 0 ohms. Raise resistance.
2. Cut the trace, scrape 2 spots on each side of the cut, and solder a 200ohms trimmer set at 0 omhs. Raise resistance.
3. Cut the trace, scrape one side of the cut facing the IC and solder a 200 ohms trimmer set at 0 ohms, to that spot and FET leg.
4. Cut the trace and solder the same trimmer to pin 13 and FET leg.
which FET leg is this
follow the trace from pin 13...same leg I just asked you guys to measure voltage.
will any of these kill my board?
i wiould like to attempt to cut the trace, but dont want to bother with an RMA
If you know how to cut the trace, you are fine. We are working on this mod, so something may go wrong.
Please, do it at your own risk.
i am going to attemp to do #4 suggestion...
so which one will be ground, pin 13 or FET leg
Solder middle leg to pin 13 and other leg to FET.
sounds good...
with a 1k trimmer i guess
im gonna unsolder it and reset it to 1k resistance
sounds good?
you have to start at 0 ohms. Also, it would be a good idea to have the vdimm mod done, so you can check if vdimm will go up, too.
oh, so i should leave the previous mod i just did on it?
yes, that's the vdimm mod. I'm thinking that the FET voltage is limited, that's why you guys can't go past 3.09 and 3 vdimm. What's weird is why yours is higher than his.
Before attempting this, could you check the readings on all legs on the vdimm FET?
when my dad leaves, i will be remodding my board and setting original trimmer back to 1k just in case
then i will procede with the pin13/fet mod