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V-Mod for Asus M4A79XTD EVO? Pencil or Not... - Page 2

post #11 of 27
9/22/10 at 6:17am
prolly going to get one of these boards in the next week or 2, the only thing ive been worried about is the vdroop if you guys can find a pencil mod for this board it will really make my day ^^
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post #12 of 27
11/16/10 at 7:23pm
Its been awhile since I first posted but I just recently found the time to work on this. A few hours of work and I was able to successfully pencil mod this motherboard.



A quick run down on the numbers.

Prior to the volt mod (2 kOhm resistance):
BIOS: 1.3875
Idle: 1.361 - 1.370
Load: 1.331 - 1.340

After the volt mod (0.8 kOhm resistance):
BIOS: 1.3875
Idle: 1.381 - 1.384
Load: 1.372 - 1.381

As you can see I didn't manage to eliminate Vdrop and Vdroop entirely but was able to reduce it to ~20% of what it originally was.

A word of caution, however, if too much graphite is applied it is possible for the voltage to exceed the level set in the BIOS. So make sure to monitor your voltage levels when pushing for a new OC.

As always, perform this mod at your own risk.

Edit: Resized image. Added resistances.
Edited by ChoiBoi - 11/17/10 at 3:38pm
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post #13 of 27
11/17/10 at 6:26am
Good stuff These EPU mods are hard to find.
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post #14 of 27
11/17/10 at 6:40am
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Cool, maybe when I get a new motherboard I'll try this.
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post #15 of 27
11/17/10 at 1:18pm
Added to the Vmod essentials.

Which Pins of the IC is that resistor connected to, Pin11 & Pin12 ?

Oh, and can you tell us the original resistance values?
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post #16 of 27
11/17/10 at 3:35pm
The original resistance value was 2 kOhms.

The results after modding were obtained at 0.8 kOhms of resistance.
Testing at 0.75 kOhms resulted in the voltage occasionally exceeding the voltage level set in the BIOS under load.

Unfortunately, I'm not sure which pins of the IC the resistor is connected to.
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post #17 of 27
11/17/10 at 3:43pm
Hmm... I might have to do this to mine so I can get 4GHz stable. I don't like setting 1.475v in the BIOS only to get 1.42 under load.
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post #18 of 27
11/17/10 at 3:49pm
wow i love ever one of u ppl this is the thread ive been waiting for
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post #19 of 27
12/3/10 at 4:38pm
So... I attempted to perform this mod on my 79XTD-EVO.

I was shading in the right resistor with a 6B pencil from an artist's graphits pencil kit, but I could not get the resistance to change for the life of me!

I was reading 1.9-2kOhms the entire time, even heavily shaded. Eventually, I just erased what I had shaded and booted the PC to see the same vdroop.

What am I doing wrong?
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post #20 of 27
3/7/11 at 2:04pm
could u please see if there's a way to vmod the m4n98td-evo? experiencing bad vdroop need help fast b4 i rma
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