P4 2.8C @3.5G would like to go higher.

[xms3500]

I have a 2.8c SL6Z5 30 cap processor currently running at 3.5.
I have had it at 3.6 with a Vcore set in the BIOS @1.5875 and it seems to run fine and is prime stable for 7 hours.
What concerns me is the big OVERVOLT that I get when I set the Vcore in the BIOS.If I set the Vcore in the BIOS at 1.5875 and then run speedfan and MBM5 and also Cpuz the voltage reading that I get is 1.71 volts.
I have a P4P800 DLX MB and have done the Droop Mod And also the Vdim Mod,and i have also done the sense wire mod on my TP430 PSU,so that I can adjust the voltage to the rails.
I have the 12v rail set at 13.20V the 5v rail set at 5.5v and the 3.3v rail set at 3.65v.
I'm also running GEIL Dual Channel PC4000 Ram,and the cooling that I have on my processor is a XP-120 with a 103cfm Panaflow fan.
I have been told that up to 1.7 Vcore is safe for the P4s but with the overvoltage that I seem to be getting I don't really like my chances of giving the processor that much Vcore without frying it.Also the CPU temp is 25 C at idle.

I would like to be able to get to 3.7 or even to 3.8 if it is possable the stepping of the CPU is MO also.


Thanks in advance to all who reply.

Also if you require any further info or screenshots please ask. :)

[enzoR]

try adjusting your droop mod, its probably set too high

[xms3500]

try adjusting your droop mod, its probably set too high

I have the 50k trimmer set at 28k ohm so I should raise the trimmer up and head for something like 30k ohm or even higher enzor.Is this correct??
Also thanks for the reply. :toast:

[xms3500]

Bump,alot of views someone else must have some ideas. :)

[VoRtAn_MaDgE]

After the mod the voltage will oscilate much less but the softwsre readings will stay worst...read the vcore in the mobo!

[xms3500]

After the mod the voltage will oscilate much less but the softwsre readings will stay worst...read the vcore in the mobo!

So what you are saying VoRtAn_MaDgE that i should only go off what I set the Vcore in the BIOS and not what the Software Programs are saying.Also what is the highest voltage that a P4 will take before is is dangerous under air,do you know??

[Moonman]

I believe it is safe to run 1.65 on air, 1.75 on water and 1.85 under PH.

[enzoR]

i'm saying play with your droop mod. the droop mod increases the voltage but reduces the flunctuations. i think decreasing the resistance reduces the voltage, i'm not sure though :confused:

and 1.7v air is safe....

[xms3500]

Thanks Moonman annd enzor,i will have a play with the droop mod enzor and see how I go. :toast:

[Moonman]

My overclock went from 3.4 to 3.5Ghz stable on air when I did vdroop mod.

[xms3500]

My overclock went from 3.4 to 3.5Ghz stable on air when I did vdroop mod.

Moonman I take it that you have a P4P800 Deluxe MB as well.
:)

If you do what does the voltages look like when you set it for example in the BIOS to say 1.6V in cpuz??

I'm not to worried about pushing the voltages in the BIOS as long as I don't go past 1.65V as i think that would be fairly safe,i just want to hit 3.8g if i can and be stable. :D

[Moonman]

Mine board is P4C800-E dlx, but I think it doesn˝t really matters a lot.
Now I set 1.6V in bios and in cpu-z shows 1.648 under load. MBM and aida show 1.6-1.61V.
As long as it is stable I dont't care. ;)