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Gonna start trying with this. Can you check the volt reading on points 1,2,3,4?
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in a moment, lemme go grab my multimeter
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1- 5.53
2- 3.13
3- 3.13
4- 3.31
heres another image
Last edited by solo; 03-31-2004 at 05:28 PM.
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hmmm...let me try again. 
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alrighty sounds good, thanks malves
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Ok bro
Gimme the readings for these pins. Also, try to find the vdimm FET. Check the voltage on those FET's, and see which one matches the BIOS.
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vdimm fet:
voltage points you asked for:
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Ok, bro
Think I got it. Solder pin 6 to pin 11 (GND) via 200k trimmer. The 200k is just to be on the safe side. You can find the correct trimmer value. Just remove (unsolder) the trimmer and check the ohms on it, when the vdimm starts going up.
Please, do it at your own risk.
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which pin of the trimmer is ground
middle or legs?
im pretty sure its the legs, but just wanna be absolutely sure
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trimmer middle => pin 6
timmer front => pin 11
start resistance at 200k. lower resistance for more volts.
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sounds good
200k trimmer is huge though :o
aslrihgt thanks for your help
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I just like to be on the safe side. Besides, that's what i'd do.
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hehe alright
i bet ill end up using a 10k trimmer
O_O!
time to start looking for a huge pot
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Well, if you wanna take the risk i say a 50k trimmer will work on that.
10k shouldn't be a problem either, if the vdimm is fed by the 3.3v rail. You'll just have a higher increase on the voltage from default in BIOS.
Last edited by Malves; 03-31-2004 at 08:48 PM.
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will i need to vmod my 3.3 rail to say get 3.5 volts?
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If the vdimm on this board is from the 3.3v, which i think it's, then yes.
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Heya Malves & Solo,
I was dissapointed to see that this thread had no further discussion with no confirmation to the mod.
Anyway, I performed the mod on my brand new 4PCA3+ rev 2.2 board today. As instructed by Malves I connected a shunt POT (10k) BTW from pin 6 to 11. I had previously set my BIOS to 2.6V (vdimm) for safety. On POST I had 2.75V.
Heres the kicker, as I decreased resistance the voltage did indeed rise to top @ ~2.97V. By increasing the setting in the BIOS for voltage the voltage does not rise above ~2.97V or so. If I set the POT to correct for say 2.7V then raise the BIOS setting then it rises as expected as well, but not above 2.97V. SO I proceeded to measure the voltage myself thinking possible EPOX Magic Health would not read above 3V. I measured the V from Ground to the back of the mosfet identified by Solo and confirmed by me. Yet again the voltage will not go above 2.97V.
I use a very new Antec Tru Power 430Watt PS unit. Its 3.3V rail is solid and I would expect to top around 3.18V or so for vdimm. As my memory is GEIL PC4200 and my CPU is Prommy cooled I need that little gain for max FSB obviously.
Any thoughts as to getting more out of this mod or board for that matter?
Thx so much.
P4 2.4C M0 @ 3.5Ghz -60degrees F
2X256 GEIL PC4200 DDR good to 280Mhz FSB 1:1
Epox 4PCA3+ rev 2.2
WD Raptor
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sorry tactical, i jut haven't had time
how low did you set resistance to?
in the 12/25 bios, it still had the 3.3vdimm option, and i think the max was around 3.11 volts
ill pick up a 10k pot soon, i only have a 1kpot right now
thanks for the update
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Hey,
I set the resistance all the way down till the POT would not turn any more. It would seem then that 0 Ohms will give about 3V. I saw the options for up to +.7V in the release bios. I did not test to see if that BIOS actually did raise the voltage any. I will test that myself in the next few days possible tonight.
Your 1K pot set to 1K Ohms across the two used pins would be sufficient presuming you have some beefy memory such as Corsair XMS, or GEIL Ultra series that is rated for around 3V anyway. But then if you didnt have good memory you wouldnt need the mod
Keep me posted.
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actually, ill test out that 1k pot then
bRB!
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very interesting, i put the 1k trimmer @ 1kohms, and right when i booted (set at 2.6v) it was already at 3.09! :o
i was like uhhhhh, so i played around wiht bios options, being 2.7 and 2.8, but no change
i started adjusting the trimmer, and i dont get a change eitehr :o
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That is very interesting. All you did I presume is connect that in parallel from pin 6 to 11 right. Also what rev is your board and what BIOS are you using?
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yeah parallel
im running the latest bios, and rev 2.2
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