Just pencil modded my PN5-E Sli... Results:

[Bungral]

Ok so I thought i'd do it as at my normal settings I experience a slight vdroop but when I cracked it up earlier I got a massive vdroop. Will show all in a second.

The first resistor I tried was what this site said:

http://www.vr-zone.com/index.php?i=4450&s=12

It didn't seem to do anything so I tried the resistor shown on this site:

http://www.xtremesystems.org/forums/showthread.php?t=127528&page=3

The results were great! I checked after doing it lightly once and still nothing so I shut down, unplugged and tried a little harder this time.. It had decreased it ever so slightly but not much. Once more, shut down, unplugged and made sure I covered it but not really thickly as I didn't want to over do it.

Results:

The Vcore set in the BIOS is 1.4375v

Pre mod:

Idle through CPU-Z = 1.440 Load through CPU-Z = 1.360 / 1.344

Idle through SpeedFan = 1.420 Load through SpeedFan = 1.360

After mod:

Idle through CPU-Z = 1.456 Load through CPU-Z = 1.440

Idle through SpeedFan = 1.460 Load through SpeedFan = 1.440

Ok so it bumped the idle voltage up a little but I can remedy that by just taking it down a notch in the BIOS.. It also means I can probably take it down a couple more notches due to there being very little Vdroop when under load.

I'm going to test some other settings I tried earlier that kind of pushed me to do the mod anyway.. I cranked it up to the following:

400mhz x 9 = 3600mhz @ 1.500v in the BIOS

FSB @ 1600mhz with RAM at 800mhz to get the ratio of 1:1.

Timings of 4-4-4-15-2T

Voltage through CPU-Z were fluctuating between 1.472 and 1.238 which is crazy... It even dropped low enough once to make the thing blue screen me and restart.

I'll go test the droop on these settings now.

 

[Bungral]

Following on from this:

400mhz x 9 = 3600mhz @ 1.500v in the BIOS

FSB @ 1600mhz with RAM at 800mhz to get the ratio of 1:1.

Timings of 4-4-4-15-2T

Voltage through CPU-Z were fluctuating between 1.472 and 1.238 which is crazy... It even dropped low enough once to make the thing blue screen me and restart.

I'll go test the droop on these settings now.

I've not got the results:

It seems that CPU-Z can't be relied upon at that voltage as it said 1.238 while idle, under load and everything inbetween so scrap that.

BIOS set to 1.50v with the additional 0.1 on Auto:

SpeedFan recorded 1.52v idle and 1.50 load.

If thats correct them i'm amazed!

It was stable after 10 mins in Orthos but temps hit high with that voltage at around 65 degrees.

 

[FarFarAway]

Ye 1.5 is pretty high on air

 

[Bungral]

I know but I just wanted to see the difference.

Its now sat at 3.5ghz on 1.43v at around 57 / 58 degrees under torture test in Prime95.

 

[FarFarAway]

Nice mate, that's a decent 24/7 OC that is

 

[Bungral]

Nice mate, that's a decent 24/7 OC that is

Well i've had it torturing all night and day now so its fine and stable with temps like I said earlier not above 58 at 1.43v so yeah thats where its staying. I might mess about with the ram speeds as per my other thread but I think CPU will stay the same as the temps are reasonable considering the setup.

I was thinking to use the 8 multi x 437 or 438 to get to 3.5ghz and still keep the 1:1 ratio as that would also be overclocking my ram a little bit.

Perhaps i'll give it a little go later... Would that take more voltage as its running a higher FSB?

I'm saving this as my BIOS Profile 1 though as its what i'll def revert to after peeing about tonight.

I'd have to loosen the timings I spose though.

 

[Ham]

Nice job there mate. I wish Asus had taken vdroop into consideration after this board was released and done a P5K-style fix for it.

What resistances did you pencil too?

And you measured the vcore via a DMM?

Mine was under volted by nearly a whole .1v. But ive got a feeling that grounding straight too the PSU may have caused that...

 

[Bungral]

Nice job there mate. I wish Asus had taken vdroop into consideration after this board was released and done a P5K-style fix for it.

What resistances did you pencil too?

And you measured the vcore via a DMM?

Mine was under volted by nearly a whole .1v. But ive got a feeling that grounding straight too the PSU may have caused that...

No idea what resistances I did it to. I just did it a little at a time and then one last harder go until I got the desired results. My dads multimeter isn't precise enough to measure it with really so haven't done it. I read speedfan got pretty accurate readings but I spose it is off a little. Either way it should read the droop correctly even if it doesn't read the real voltage very well.