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OCN's V'mod Squad's, Volt Mod Essentials! - Page 124

post #1231 of 1500
Quote:
Originally Posted by cold.nut View Post

performed this vdroop mod yesterday and all i got was a board that didn't post and had a loud squeal in the general area that i performed the mod. the initial resistance on that pin was 13.7k ohms. i fixed a 50k ohm VR dialed to 27k ohms to the mod point. the resistance after the mod on the vdroop pin was 9.1k ohms. which means that it dropped in resistance.

it's beyond me. the mod should have worked properly. i made sure twice that i hadn't shorted anything and that the VR was a complete circuit. still nothing.. good news is the board is still up and going after i removed the mod.

anyone? :headscrat


If stock resistance measured at 13.7k ... then you would need much closer to 100k ohm VR for mod. I think resistance is too low... though for vdroop you can usually take it down to like ~2k ..so im a bit confused as well. 

 

**You look up the ADP datasheet to make sure vdroop is correct?

**You try vmod first.. ?

post #1232 of 1500
yeah i verified the mod point ADP3180. it should work fine.. i haven't tried vCore or vMemory yet. that loud squeal really shook me up. i don't want to lose my P4C800-E that quick smile.gif. i'm just going to give it a bit before i give her another go.

should i try tuning a 100k VR to 100k and soldering it on the point?
post #1233 of 1500

Yeah.. i would start with the higher resistance, just to see if you get the same result. *I have the same mobo.. can look into the mod this weekend and see what Im getting on mine in comparison.

post #1234 of 1500
sounds great! keep me posted man. meanwhile i am going to do vCore and vDimm.

thanks
post #1235 of 1500

looks like vdroop mod is done off of CSCOMP pin18...  can you verify the resistance at the pin is the same as the point you were modding?

 

 *As well.. you may consider adding some resistance to RT pin13 to increase current supply, and lowering resistance on ILIM pin15 to lower the OCP limit [default 60A]

 

the defaults are:

 

OCP- 60A = lower ILIM to raise limit

Rt Switching freq- 267khz = raise RT to lower phase response and increase current potential

post #1236 of 1500
vDROOP mod was on the wrong end of the resistor. fixed thumb.gif!



what VR should i use for ILIMIT & RT?
post #1237 of 1500

For ILIM/OCP mod - just use standard formula of [20x original resistance] for VR.. you just want to lower stock value 20-50%

 

For RT.. you want to increase resistance... removing the resistor and replacing with a VR would be 1x way to complete the mod. You would use the same formula to calculate VR size, once the resistor in question was removed, so you could measure resistance on the RT pin without it inline. wink.gif

post #1238 of 1500
sweet! i will have to do that today. now as far as vdroop mod goes, i didn't see any performance gain in soldering the VR on. i have the VR set to 24k ohms and the overall resistance on pin 18 is 23k ohms. stock was 98.4k ohms. redface.gif
post #1239 of 1500
Quote:
Originally Posted by just_nuke_em View Post

First of all, which version board do you have? There are differences between the versions (don't ask me what they are as I only have a NF7-M).
Second, all the mod info should be here: http://www.xtremesystems.org/forums/showthread.php?47015-Searching-NF7(-s)-v2.0-Vdimm-to-3-3V-Rail-mod
Just ordered one smile.gif. Took a look through my gpu box and saw a couple that could probably use it.

thank you so much, well i do have the right board and everything but just not sure why it booted once and now it's not and if i remove the mod it'll boot right now
post #1240 of 1500
Quote:
Originally Posted by cold.nut View Post

sweet! i will have to do that today. now as far as vdroop mod goes, i didn't see any performance gain in soldering the VR on. i have the VR set to 24k ohms and the overall resistance on pin 18 is 23k ohms. stock was 98.4k ohms. :o


Now.. just to be clear.. you mean you see no difference in the amount of voltage droop from idle to load... or you still see the same amount of droop between set vcore and actual? 

 

**The mod should correct the first instance.. not always the 2nd.

 

-Have you tried going lower with resistance? I remember vdroop on P5B got down into single digit's... just wondered if you tried.

 

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