Asus P5B Deluxe Pencil Mod?

[dnottis]

Yes that is the one I shaded on my P5B. The reason I highlighted the picture is because excluding that part the rest of the motherboard's transister positions are different, however the 4th lead from the vreg chip is the one that controls the vroop apparentally on all p5b boards since it worked very well on mine.

Cool -I just wanted to make sure, no one really showed the location on the board from far away. Plus mine are in a different location. I appreciate the help!!

[ziddey]

Hey dnottis, you have a dmm? I found vdimm pencil mod for p5b vanilla and might be able to help with -e. I know you're not liking the 2.1v

[dnottis]

I just cleaned and recoated the SB, NB and did the pencil vcore mod. Also, popped the cap off the NB sink and stuck a 50mm fan on there.

What a difference!!

This is with 1.38v set in bios, idle is 1.386v, load is 1.392 lol. Great job, fast - easy mod...

[ziddey]

man what a good chip you have

[Roger_D25]

I just got my basically new un-modded P5B-Deluxe a few days ago from the "For Sale" thread here to maybe replace my eVGA 680i. I have pretty much spent the last few days stability testing this board to get some decent baseline numbers with no mods. The stock vdroop resistor's value was 80.02 kohms and I lowered the resistance value to 25.04kohms, this gave me stable voltages upwards of about 1.55v. Voltages set above that in BIOS exhibited vdroop although not as bad as stock. Below are the CPU voltage values I was getting before pencil mod.

Pre-Pencil Mod:
VCORE (BIOS Setting): 1.45v
Actual DMM Measured Value (Idle): 1.434v
Actual DMM Measured Value (Load w/Orthos Small-FFT's): 1.392v-1.388v
Vdroop Between Idle/Load: 0.042v-0.046v

Post-Pencil Mod:
VCORE (BIOS Setting): 1.45v
Actual Measured Value (Idle): 1.445v
Actual DMM Measured Value (Load w/Orthos Small-FFT's): 1.443v-1.441v
Vdroop Between Idle/Load: 0.002v-0.004v

This mod certainly has the most bang-for-buck of any mod I've done before, lol! The 5min it took me to pencil that resistor was well worth it and I'd suggest anyone try it if your hesitant to hard-mod it (even though a hard-mod would be more reliable)! Posted below are some of the stability tests I have run since doing the pencil mod, nothing crazy but great baseline numbers before I really start pushing things!

[sammurai]

I need pencil mod for dimm, and i find that:
Is ok? (works?)

[alexio]

Just did the vdroop mod on my board, highly recommended. It's the easiest thing ever

Celeron-D 1.475v = 1.40-1.43 load-idle (without mod)
,, ,, = 1.46-1.46 load-idle (with mod)

20 second job

[sammurai]

Done..for CPU.

But i need pencil for vdimm...

[JMKS]

I need pencil mod for dimm, and i find that:
Is ok? (works?)

Yes, it works. But on my P5B-Dlx it was very non-linear (well, my first pencil-mod, not a perfect job for sure ), eg. 1,8 => 1,8, 2,0 => 2,15; 2,4 => 2,4 and finally 2,45 => 2,8V or later, after some "adjutsting" it was 2,45V => 2,6V which satisfied me .

[metro.cl]

can anyone put a pic of before and after vmod? i think im not doing it right (not enough painting the resistor)

[dinos22]

Here points of measurement:
Attachment 56836

My dmm works perfectly, for example:
BIOS: 12,14 Measured: 12,10
BIOS: 5,08 Measured: 5,12

i've had a couple of these boards now and ONLY spot that reliably measure vcore for me is the red one here

[asmodean]

This mod is awesome
me and my buddy did it yesterday and now i can run my e6300 at 1.1375V (bios) / 1.10 (windows)

[n91htmare]

I just did this mod. But I have a reverse Vdroop issue. lol.

I set 1.45 in bios and when I run orthos, I get 1.46V

I guess it means I used a bit too much lead. Is this harmful? or should I be OK?

My Vcore NEVER drops below 1.45v in windows if I set it to 1.45 in Bios.

[Roger_D25]

n91htmare,
Well when you were applying the lead to the resistor how much did you lower the resistance (did you use a DMM to do this)? Although people do it all the time it is a VERY good idea to use a multi-meter when making any modifications like this because otherwise there is no way to know how much you lowered the resistance.

In my case I lowered the resistance of the vdroop resistor to about 24.21kohms which in my case seemed like the best value (I only used voltage under 1.55v). With that all said I don't know if it is harmful or not. I suppose there is a chance you lowered the resistance to much that its now just a connection with no resistance, this might be harmful? Hopefully someone with more experince than me will verfiy this or not?

[n91htmare]

well I measured it at 19.2kohm So I redid it to about 24kohm.

Now when i set 1.48 in bios, I get about 1.46 in windows......

[fscussel]

is it ok to go beyound 14.5 ohm?? like 5 ohm or less? does it shortens the lifespan of the motherboard? or is this correction absolutly healthy?

EDIT: it´s not ohms, it´s KOHMS, with means kilo ohms, wich means 1000 ohms, so default 80.000 ohms, to mod: 15.000 ohms, I don´t know how you do that by pencil, I have tried different ways and only got it down to 75.000 ohms, I can´t believe you go down as 15.000 ohms by pencil!! how is that??

[T_M]

i've had a couple of these boards now and ONLY spot that reliably measure vcore for me is the red one here

Sorry to thread dig, but i've seen a lot of discussion on where to measure Vcore, and a few people saying that the best measure points (socket side of the coils) is very difficult you access. I'd just like to point out to those who haven't thought of it, that the coil contacts protrude out the rear side of the mobo so you can just measure from them

[W4ffl35]

Well, I just did the mod,

Before mod - Set Bios 1.5v / Windows 1.44 under load
After mod - Set Bios 1.5v / Windows 1.48~.49 under load

Totally worth it.

[graysky]

Can someone point me to a guide for this mod? I'd be interested in something that shows exactly which of these to shade, and where it's located on the board (P5B-Del).

[dnottis]

[DarkSephiroth]

Does this apply to the Commando also? Since they're almost identical?

[graysky]

Wow, this worked so well. I used a 2B pencil I got in a pack for $3.

Before I ran with w/ a BIOS vcore of 1.3250 and got (CPUz) idle/load: 1.280v/1.232v which is a vdroop of 0.048v/0.050v respectively. After the mod I get the following (CPUz) idle/load: 1.296v/1.288v which is a vdroop of 0.008v/0.010v respectively. I just now adjusted the BIOS vcore down to 1.2625v which gives (again CPUz) idle/load: 1.232v/1.232v which as you can see is a vdroop of 0/0.

I have a q6600 @ 9x333 by the way.

Thanks to all for this great info.

I guess this only lowers idle power consumption and temps since my load vcore is the same as pre-mod, but I'll take it

[graysky]

I ended-up making a new post for this here with higher quality pics.

Question: how long does this last for people. I read 6 mo. in this thread. Can someone who has done this a while ago comment? dnottis maybe? Others?

[dnottis]

I ended-up making a new post for this here with higher quality pics.

Question: how long does this last for people. I read 6 mo. in this thread. Can someone who has done this a while ago comment? dnottis maybe? Others?

Mine has been ok for about 6 months now. I just redid it the other day, used a qtip with isopropyl alcohol, wiped it and reapplied. Didn't need to but did it since the board was out anyways. I'd say until u have problems it will prolly last quite awhile...

[Buckster]

couple of questions please guys ...

1st one - do you have to be ULTRA careful when applying the pencil - as graphite is a conductor - so if any "dust" gets on any surrounding tracks etc is it a major problem ?

2nd one -is that the reason people use the "clear" paper when applying to stop the dust getting anywhere it shouldn't on the mobo ?

thanks, Mark.