Ds3R rev 2.1 hissing and burnt smell after vdroop

[coldmantis]

I recently did a vdroop mod with conductive paint, the results were great but I noticed under occt stress test the mosfet are hisses and I have a 120mm case fan on top of my case that sucks air out, if I put my nose to it I can smell a destinct burnt smell, I left the computer on for 6 hours doing the cpu test and nothing has gone wrong with the motherboard, should I be worried?, I took off the mod and the hissing and smell went away. btw b4 the vdroop mod I could only boot to windows with my quad at 4ghz with 1.6v after the mod I could do it with less then 1.4v

[celemine1Gig]

All I can think of when reading this is:

"The Cardigans feat. Tom Jones - Burning down the house" :lol:

I'm sorry, but I couldn't help myself. :)

Just ask yourself this: Were the engineers bored when implementing the Vdroop function, or could there be a reason why they did it? Hmm... :shrug:
One hint: A burnt smell is a unmistakeable sign that the VRM really LOVES what you did.

Do some reading on Vdroop and you'll know your answer. Although common sense should be faster at giving you an answer.

[Eldonko]

Probably a transistor frying or I have saw the actual pcb burn before but the board still work. Look closely, your board has limited time to live.

[cowpuppy]

Just where did you get this mod from as from what I have seen there weren't any mods of yet. The DS3L looks like a different board and in this thread http://www.ocforums.com/showthread.php?t=558347 I belive some1 posted that the mod didn't work with the DS3R . If you have a link to the mod please post.

[celemine1Gig]

First of all you don't do a vdroop mod with conductive paint, but with a proper resistor in the right location. If a board is designed with VDroop in mind, then completely eliminating it is a BAD idea, as the thread starter has clearly showed. In fact you shouldn't really do any vdroop mod without adding decoupling capacitance, or you'll most likely end up with BIG voltage spikes. It is more or less OK, though, if you leave some droop voltage. That's to say, most likely nothing will die instantly.

AND, you don't buy a quite cheap mainboard to run your quadcore at 4GHz. These things simply are not designed for such high loads! The Vdroop function is also there as a form of a safety measure. It makes VCore drop the higher the current gets that the CPU draws. If it get's too high (the current draw), then the voltage will drop substantially, taking stress off the VRM. What the threadstarter did was to force huge amounts of current through the VRM while it was already working on the edge. He's lucky that nothing caught fire or simply blew up due to the extreme stress on the components.

This is ridiculous. Poeple have no clue what they are doing and then ask questions that everyone with a bit of common sense should have answered by himself in no time. I mean, hello, burnt smell and hissing sound. Do you really think that computer mainboards should have these two characteristics? :shakes:

[whe3ls]

i totally agrree with you. i ended up killing my abit ip 35 e after running my quad @ 3.825

[Timbosan]

As said above, you have damaged the board. The smell is parts of the power circuitry vaporizing/smoking and this means they are incredibly hot. Remove the mod, and look into getting a new board, as if I were you, I wouldn't want my cpu/ram/card running on a damaged board. In future, you should endeavour to perform hard mods, as they are accurate and the professional approach. Pencil/conductive paint is a very dodgey method of modding.

Also as said above, vdroop is there for a good reason, and to remove it or even alter it from the engineered standards of the board and its components is going to cause you trouble. Freecableguy has done a great write up on the reasons behind and the need for droop on the tech repository site.