MSI P43-C51 vdroop mod - Overclock.net - An Overclocking Community
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MSI P43-C51 vdroop mod

 
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post #1 of 5 (permalink) Old 08-16-2015, 10:14 AM - Thread Starter
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Hi

I am trying to figure out a way to lessen the vdroop on this board.

I found the data sheet and also took some photos of the area in question.

Could you please help me?

Data sheet: http://www.intersil.com/content/dam/Intersil/documents/isl6/isl6333-a-b-c.pdf
Look at pages 2, 12, 24 to get started. It appears as though a single resistor is responsible for the amount of droop, pointing to the possibility of a pencil mod.

Pictures of motherboard:
http://oi62.tinypic.com/vijuvl.jpg
http://oi57.tinypic.com/1zfso75.jpg
http://oi61.tinypic.com/29ohcvk.jpg

Edit: please excuse the image host, to view full size images, click on the photo and view raw image at the bottom
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post #2 of 5 (permalink) Old 08-28-2015, 09:39 PM
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According to page 24, Vdroop = IAVG * RFB. To minimise Vdroop, you must minimise the resistance of RFB. RFB is connected to the pin12/Vdiff (green) and pin10/FB (blue). I cannot see the routing very well in your photos, so you'll need to find RFB yourself. There should be two resistors attached to Vdiff. Make sure you pencil mod the resistor which is directly attached to FB, not the one connected through a capacitor.

On a side note, please don't use that awful picture host. Just use OCN to host your pictures. It forced me to activate js to view your pictures, and sexist ads showed up. Yuck sicksmiley.png.
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post #3 of 5 (permalink) Old 08-29-2015, 08:52 PM - Thread Starter
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Thank you for your answer.



Am I on the right track?

I did pencil it. Lead to a Vcore drop of 0.1v. Could have caused a faulty reading, but the temps dropped too.
What is weird is that it booted. More so, 10 rounds of IBT shows SOME stability. Going for my super secret stability test. (Put Trevor in a large trucks bed, have AI drive him around, if GTA V crashes, unstable.)

If none of the above makes any sense, it is because of me being exhausted.

I am sorry you had to see ads.

EDIT: I managed to exhibit symptoms of Thought,


1 is the one I penciled today
2 was the first one I tried before making this thread, could it have been not enough? It didn't work then.
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post #4 of 5 (permalink) Old 08-30-2015, 04:37 AM
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I'm pretty sure the components you leaded are ceramic capacitors. I think the black ones are resistors, although there are black ceramic caps too. Maybe you check the resistance of the component with a multimeter to make sure it's a resistor? Like I said, the resistor you're looking for is in the yellow square. The caps you covered with led are part of the red square:

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post #5 of 5 (permalink) Old 08-30-2015, 03:25 PM - Thread Starter
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Those are ceramic capacitors indeed. Shows how much I know. Well, I unexpectedly gave the motherboard to my brother, this thread can be forgotten.

I am grateful for your effort trying to help my incompetent self.
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