Vdimm mod for P4P800?

[luihed]

Anybody figure out the vdimm mod for this mobo yet? Since the mod is the same for the P4G8X and P4C, would it also be the same for the P4P?...thx

[leinad78]

http://www.xtremesystems.org/forums/showthread.php?s=&threadid=13402&highlight=p4p800

[luihed]

Thanks, but ive read that thread before and it never said that the mod is the same as the P4C..... Opp, Macci ?

[macci]

Same mod works on both P4C and P4P. Locate LM358 and connect pin 6 to GND (or to pin 4) via 50kOhm VR. Note that the LM358 is placed a bit differently on P4P.

[macci]

heres a pic w/ Vdimm measurement:

[OneProdigy]

Here are some better pics i took when i modded my p4p800...
I think they're self-explanatory.
Good luck! ;)

http://home.t-online.de/home/320072397750-0001/p4p800/p4p800_1.JPG

http://home.t-online.de/home/320072397750-0001/p4p800/p4p800_2.JPG

http://home.t-online.de/home/320072397750-0001/p4p800/p4p800_3.JPG

[DJD]

Very easy and helpfull!! thanx OneProdigy

[OneProdigy]

Well...there's something strange i already noticed before doing the mod...
The dimm in bank B (both B1 and B2) gets freakin hot whereas the dimm in bank A (both A1 and A2) is barely hand warm! :confused:

When i switch the dimm in slot A with the one in slot B it's still the same...the on in slot B smokes (even when idle!) and A is merely warm to the touch.

Does anybody know the exact location on this mobo to measure vdimm for each dimm slot so i can find out if bank B possibly get's more juice than bank A?

Any help would be greatly appreciated!

[Trooper_GR]

Thanks for this info ! ! How should I ask the 50kohm resistance ? Is there something else besides the 50khom trimmer ?

We measure the voltage between the yellow marker that I see in the picture ?

[Spec3]

At what resistance should I be seeing a change in voltage? I dropped all the way to 20ohm's and no change. I don't think I got good contact.

[Dr. GoodenHigh]

well it looks like OneProdigy
has his wiring switched around?
any pot I've used the middle connector was Ground.

Originally posted by Spec3
At what resistance should I be seeing a change in voltage? I dropped all the way to 20ohm's and no change. I don't think I got good contact.

[Trooper_GR]

Originally posted by Spec3
At what resistance should I be seeing a change in voltage? I dropped all the way to 20ohm's and no change. I don't think I got good contact.

You should have measured with a multimeter the pot and see the two pins that give the correct measurement.. Those two are the ones that you need to solder....

[Spec3]

I figured it out. Wasn't getting contact with the chip

[noidster]

Any idea how to get more than 3.2v on the vdimm?

thanks
noidster

[x2sandman]

OneProdigy kind of off topic, but what camera did you use to take those picutes, they came out very nice and when i tried to take pics like those today with my kodak 3.2MP camera it was just one big blur.

[skate2snow]

thats all what you have to do?!?!?!

[OneProdigy]

Originally posted by x2sandman
OneProdigy kind of off topic, but what camera did you use to take those picutes, they came out very nice and when i tried to take pics like those today with my kodak 3.2MP camera it was just one big blur.


Sorry for the delay! ;)

It's a Fuji Finepix A202 (2.0 MPixels)...nothing special, but absolutely sufficient for my needs. :D

[a5h]

how do u measure the vdimm voltage with a volt meter ...is it the red wire to that mosfet in the pic ...and the other black wire to ground? ...and then that shud show the vdimm voltage right?

[OneProdigy]

The point for reading out vdimm is shown in the first pic...just grab a volt meter and hold it between this point and ground.

[shimmishim]

so yeah take the red probe put it to the spot in the picture and put the black probe to ground... i.e. the case or anywhere metal hehehe :)

[a5h]

gotcha ;)

[skate2snow]

OneProdigy: Where did you take your wires(+47K)??

And after the mod, will you have the option(in the BIOS) to change it, or it will be something like: 2.8V=3.05V??

[asw7576]

Thanks OneProdigy

I just transformed this:

http://mywebpage.netscape.com/asw7576xx/CT-D43.jpg

Into this!!!!

http://mywebpage.netscape.com/asw7576xx/275FSB.jpg

VDIMM : 3.266V

[OneProdigy]

:toast: Not bad man!
No problem, glad my pics were helpful to ya. ;)

Those hynix-chips seem to be quite good oc'ers...aren't these the same chips that A-data and OZC put on their PC4000(+) modules?
If i may ask...where did you get these sticks from and what manufacturer is it?


@skate2snow:
1. I'm not quite sure what you mean... :confused:
One goes to ground and the other to pin6 of the LM358 regulator... (just take a closer look at the pics!)

2. Afaik - switched a few mobo's since i had it ;) - the P4P800 doesn't show vmem in bios.
But of course you can still adjust vmem via bios.
Depending on the resistance of the pot 2.8 V in bios is 3.x V in real...that's why you should monitor your voltages closely via a voltmeter (at the two described points) when you first switch on your system after doing the mod.

[varelasj]

Any fwtos how to do it exactly???