Help mod 3.3 rail on PCP&C 510D

[REDKEN]

Hi guys!

I want to get more power to my memory and need to mod the PSU but don't know how. Adjusting the pot on the 510 doesn't do much.

Thanks!

P.S. What would be a good number to shoot for? Maybe 3.6?

[sp00L]

Void your warranty and remove the cover. Find the 3.3 line pot inside, remove it and add a 1K-2K trimmer on the outside and away you go.

There are a number of posts in these forums on different methods. The one I just described is what I used. I ran 3 wires to the outside of the psu and connected a 10K vr .75 watt trimmer. 10K is a bit too much as over 3.9-4.1 volts, the psu shuts down. but it works great.

Do a search and you'll find some great pics to guide you. 3.6 should be a good goal as most monitoring programs alarm after 10%.

[REDKEN]

Thanks spool!

I did a search but didn't find anything specific on the PCP&C 510 (only one and didn't talk about modding it)

Find the 3.3 line pot inside, remove it and add a 1K-2K trimmer on the outside and away you go. You mean, rip-out the one it has and replace it with a 1k-2k trimmer?

The one I just described is what I used. I ran 3 wires to the outside of the psu and connected a 10K vr .75 watt trimmer. 10K is a bit too much as over 3.9-4.1 volts, the psu shuts down. but it works great. Is this done after the original pot inside the PSU is taken out?

I'm sorry but this is not very clear to me yet. Is there a chance there would be a step-by-step guide to this on a 510d? Or, is this a standard way of modding the PSU?

[freecableguy]

I just unsoldered my 12V and 3.3V trimmers (5V trimmer is very difficult to get to) and replaced the 500 ohm versions with 1000 ohm versions of the exact same deminsions. I now can trim my 12V line to about 12.65V and 3.3 to 3.6V...perfect.

[charlie]

hmmmmm...........
all that $$ and get's it a** pwned by a Fortron 530...........

[bachus_anonym]

there is a very informative thread right here (http://www.xtremesystems.org/forums/showthread.php?s=&threadid=31886&highlight=Power+Cooling)
and there's quite a few people that modded it that way (including me :) )
also if at all then this post should be in Xtreme Mods section.
Originally posted by charlie
hmmmmm...........
all that $$ and get's it a** pwned by a Fortron 530...........
yeah, i have also Fortron 530 that doesn't shut down as PCP&C does... OVP sucks on that otherwise great PSU.

greets,

[mrlobber]

http://www.xtremesystems.org/forums/showthread.php?postid=432826#post432826, a great guide written by Hell-Fire, a specialist in these problems.

[freecableguy]

You can adjust the OVP pots as well. Or you can replace them also to allow more headroom.

[REDKEN]

Originally posted by freecableguy
I just unsoldered my 12V and 3.3V trimmers (5V trimmer is very difficult to get to) and replaced the 500 ohm versions with 1000 ohm versions of the exact same deminsions. I now can trim my 12V line to about 12.65V and 3.3 to 3.6V...perfect.

I just found this (http://www.xtremesystems.org/forums/showthread.php?s=&threadid=37574) thread here.
Is the way you did it easier than doing it with the sensor wires?
Could you link me to an explanation on the mod you made?
Thanks!

Edit: Thanks guys, I was writing my post right when you guys replied :)

[REDKEN]

Originally posted by freecableguy
You can adjust the OVP pots as well. Or you can replace them also to allow more headroom.

How? and How much headroom do I have now? How high will it let me to go until it shuts down?

[REDKEN]

OK. I just got home from work and I understand how to check the 12v and 5v rails using the bridge on the PSU, but how do I check the 3.3v rail?

[sp00L]

1K will give you at least 10% room. Here are a few threads:

http://www.xtremesystems.org/forums/showthread.php?s=&threadid=18118&perpage=25&highlight=replace%20pots&pagenumber=2

http://www.xtremesystems.org/forums/showthread.php?s=&threadid=31886&highlight=replace+potentiometers

Basically, I removed the pot for the 3.3v line. It's a 3 leg 3/4 turn pot soldered onto a pcb inside the psu. You can identify it because of the holes in the side of the psu that allow you to adjust the 3 lines. You remove a braket and simply heat the 3 legs and gently pull the pot out. Then you run 3 insulated wires from the pcb where the original pot was to outside the psu. Solder the new pot to these 3 legs. Make sure you measure the resistance of the old pot and the new one so that you connect the new one the same way as the hold one and turning the screw on the new one goes the same direction as the old one to raise and lower the voltage. Put the psu back together and test it out. I used a 10K pot because it was available. Over 2K ohms the psu will shut itself off, so be careful. Another advantage is that it's now easier to adjust the 3.3 line with the pot on the outside of the psu. Sorry I don't have a camera for pics.

[sp00L]

Originally posted by REDKEN
OK. I just got home from work and I understand how to check the 12v and 5v rails using the bridge on the PSU, but how do I check the 3.3v rail?

I'm assuming you know how to "jump start" the psu without connecting to the mobo. Basically, the 20 pin connetor, connect a wire from the green line to a black line (ground). Start the psu and use a multimeter to measure the lines. One end to a black wire on any of the molex connecters and measure a red for the +5v, yellow for +12 volts, and orange for +3.3v.

[REDKEN]

Hey guys!

I did the mod a couple of days ago (had to wait for the trimmers to get here)
and it went great! :toast: Now I can adjust my 3.3v rail up to 3.78v idle with no problems.
I do have three more question. Where is the OVP trimer?
If I adjust it and it doesn't give me the head room I want. Would replacing with a 1 or 2k trimmer be OK? and last but not least. How many volts would be OK to give to the 3.3 rail?

Thanks!

[spaceman]

1K will give you at least 10% room. Here are a few threads:

http://www.xtremesystems.org/forums/showthread.php?s=&threadid=18118&perpage=25&highlight=replace%20pots&pagenumber=2

http://www.xtremesystems.org/forums/showthread.php?s=&threadid=31886&highlight=replace+potentiometers

Basically, I removed the pot for the 3.3v line. It's a 3 leg 3/4 turn pot soldered onto a pcb inside the psu. You can identify it because of the holes in the side of the psu that allow you to adjust the 3 lines. You remove a braket and simply heat the 3 legs and gently pull the pot out. Then you run 3 insulated wires from the pcb where the original pot was to outside the psu. Solder the new pot to these 3 legs. Make sure you measure the resistance of the old pot and the new one so that you connect the new one the same way as the hold one and turning the screw on the new one goes the same direction as the old one to raise and lower the voltage. Put the psu back together and test it out. I used a 10K pot because it was available. Over 2K ohms the psu will shut itself off, so be careful. Another advantage is that it's now easier to adjust the 3.3 line with the pot on the outside of the psu. Sorry I don't have a camera for pics. I have a 10k pot here, but for some reason 2k ones are hard to find. If I just use that, do ya think it would be possible to use the full 4.0v available in the DFI BIOS? Obviously, I'd have to work with the OVP, but this looks reasonable. Or is there such a monster as a 4k vr? That might be a lot safer. ;)