NF7-S vCore Troubles

[Praetereo]

My vcore mod recently just stopped working for no apparent reason. I used the traditional method, and it was stable and worked fine for a while, but now the system will not post with the vmod in place. I checked all connections many times, tried different variable resistors, non variable resistors, lowered the voltage to make sure it was not OVP, basically everything I could think of. I need help figuring out what the problem could be. The system is perfectly stable and runs fine when I pull the voltage mod off, but the instant I put it back on it refuses to boot. I am stuck around 2.6GHz without this mod :( Any ideas?

[heilmery]

Yeahp. I have the same problem so I will throw a bump in here to find out.

My comp will not post with the mod in but as soon as i undo the ground and reboot. It posts just fine.

What resistor are you using. I am using a 22k ohm resistor 1.25w. This is the same mod setup i used on my kg7 and kx7 and now my nf7-s but it won't work. What are we doing wrong

[IamAnoobieCheez]

That's easy.


You need about 25k ohm of resistence to boost approx. 0.17v which totals out 1.97~ 1.98V in actual voltage of NF7 rev1.0.(which sux ass... due to low voltage output approx 0.5~ 0.8V less). To make a 25k ohm of resistence, you could add 2x 1.5kohm resistors to the 22kohm resistor which equals to 25kohm.

If you make a resistence to keep the overal voltage range below 2.00V, you may be able to run ok. But, you still may run into some OVP crap kicking in even though you're at below 2.0V. Amazingly stubbron OVP on the NF7 rev1.0 ain't it.. :rolleyes:

[IamAnoobieCheez]

and if you wanna play really safe and secure so that there's no way in hell OVP kicking in, just use a 47k ohm resistor only. That'll give you approx. 0.10V boost. That would realistically, give you total of 1.90V on the NF7 rev1.0 only. It won't give you 1.95V coz like I mentioned earlier, these rev1.0 boards puts out low Vcore voltage by approx. 0.5V~ 0.7V less.

It would give you 1.95V on the NF7 rev1.1.

[heilmery]

Thanks man. Did the trick too. Now i can get 1.95vcore. Didn't really stop to think what was going on but you made the fog clear. Now i am sitting at 2.3ghz with my 1700+ juicb 0251

[IamAnoobieCheez]

no prob... glad that worked out for you. :)

[heilmery]

So u were saying about the 25k ohm and all. I got that done now and i can boot most of the time but somethimes it just won't post. SO i restart and the cpu is set to 1100mhz. Pisses me off. So for now just the 47kohm resistor. I think tho that my 12v line is a little low for all this. It shows 11.7 when i have the 25kohm resistance and 11.85 when i do the 47kohm resistor.

So i am looking to see if my antec truepower 350w is pot adjustable??

[IamAnoobieCheez]

Originally posted by heilmery
i can boot most of the time but somethimes it just won't post.
yes... exactly :D


I think tho that my 12v line is a little low for all this. It shows 11.7 when i have the 25kohm resistance and 11.85 when i do the 47kohm resistor.
yes... exactly. around 11.7v on the 12v line is the usual behavior for the NF7 rev1.0. Mine is exactly like that too as well as some others I have heard. It's the board. Rest of your hardware is fine. Your PSU is fantastic.


i am looking to see if my antec truepower 350w is pot adjustable??
I'm not sure about the truepower 350watt. The Antec i'm using on the NF7 rev1.0 is SmartPower 350watt and does not have Pot adjustments either. I know the Antec PP403x/412x 400watt has pot adjustments because I had one. You could try open up your PSU box and see what's in there..

[mike.elmes]

Negatory...the Truepowers are not pot adjustable.Not unless you care to open her up and mod the psu.;)

[heilmery]

Has anybody figured out the ovp for the nf7-s yet. I heard opp has but i can't find it.

[IamAnoobieCheez]

no he failed. hehe..