Post by Mr.Scott on May 19, 2019 7:28:15 GMT -5
VCore-Mod
Datasheet of the chip:
www.intersil.com/data/fn/fn4765.pdf
Connect the middle pin of the 50K potentiometer to Pin #7 (FB) of the HIP6301 chip and then connect the outer pin of the potentiometer to Ground.
Pin #9 of the HIP6301 is a Ground pin, but we will need to solder a cable to the next Pin #10 for the OVP-Mod. I didn't like the idea of soldering two cables right next to each other.
That would've been very hard, and why do it the hard way, if there's an easier way right around the corner. For Ground I just used the Ground point from a left-empty solder-pad
("EC18"), where DFI had planned to put a capacitor, but cancelled that idea obviously (solder point in the area that is marked white, is GROUND). Use that point as Ground for both
the VCore- and the OVP-mod, it will have no negative impact on the mods.
OVP-Mod
Same chip, so no new datasheet link needed (still HIP6301).
The OverVoltage Protection-Mod is only needed, if you are going to run a VCore higher than 2.0V.
As I already mentioned above, the OVP-Mod involves connecting a 50K potentiometer from Pin #10 of the HIP6301 chip to Ground.
Just connect the outer pin of the potentiometer to the Ground point mentioned above (left-empty solder-pad, not far from the HIP6301 chip). Then connect the middle pin of the
pot to Pin #10 (VSEN). Well, that's it and you've finished the VCore and OVP mods.
VDroop-Mod
As many of you already know, the DFI board has some quite high VCore fluctuations under load. That's why some smart guys figured out a VDroop-Mod for this board, to reduce
those fluctuations.
This mod is rather delicate as you need to remove 3 SMD/SMT resistors on the board in a cramped area and replace them by SMD/SMT resistors of different values.
The resistors, marked in the pic, need to be removed and then you solder in one of the SMD/SMT 4.7K resistors in each of the marked locations.
I'd advise you to order more than just the three needed resistors, as you may need to try that mod more than once before you succeed. Sometimes one or two resistors get
damaged (due to overheating or whatever), so be sure to have a replacement!
VDD-Mod
Datasheet of the chip:
www.national.com/ds/LM/LM158.pdf
Connect the middle pin of the 50K potentiometer to Pin #6 (Inverting Input B) of the LM358 chip. Then connect the potentiometer's outer contact to Pin #4 (Ground/GND).
The measuring point for VDD is located in the top right corner of the pic. It's the right leg of the VDD mosfet.
VDimm-Mod
Datasheet of the chip:
www.semtech.com/pdf/sc2616.pdf
The middle pin of the 100K potentiometer normally would need to be connected to SC2616's Pin #1 (FB). But as the chip has very tiny legs/contacts, that would be nearly impossible to do with normal equipment. Thus we trace pin #1 to a SMD/SMT resistor just next to the chip (marked in the pic). Now you need to connect the potentiometer's middle pin to the side of that resistor, facing the greenish capacitor next to it, as seen in the pic. After that you have to connect the outer pin of the potentiomter to Ground. Just like when doing the VCore-/OVP-Mod, I used an empty solder pad ("EC57") as Ground. Again, it was planned to be used for a cap and was then left empty in the final product (see the pic for details). Measuring point for Vdimm is on the second mosfet from the left, under the RAM slots. Make sure to take a look at the pic for the correct leg, as it depends on how your board is placed on the table. That way, you can't go wrong.
Datasheet of the chip:
www.intersil.com/data/fn/fn4765.pdf
Connect the middle pin of the 50K potentiometer to Pin #7 (FB) of the HIP6301 chip and then connect the outer pin of the potentiometer to Ground.
Pin #9 of the HIP6301 is a Ground pin, but we will need to solder a cable to the next Pin #10 for the OVP-Mod. I didn't like the idea of soldering two cables right next to each other.
That would've been very hard, and why do it the hard way, if there's an easier way right around the corner. For Ground I just used the Ground point from a left-empty solder-pad
("EC18"), where DFI had planned to put a capacitor, but cancelled that idea obviously (solder point in the area that is marked white, is GROUND). Use that point as Ground for both
the VCore- and the OVP-mod, it will have no negative impact on the mods.
OVP-Mod
Same chip, so no new datasheet link needed (still HIP6301).
The OverVoltage Protection-Mod is only needed, if you are going to run a VCore higher than 2.0V.
As I already mentioned above, the OVP-Mod involves connecting a 50K potentiometer from Pin #10 of the HIP6301 chip to Ground.
Just connect the outer pin of the potentiometer to the Ground point mentioned above (left-empty solder-pad, not far from the HIP6301 chip). Then connect the middle pin of the
pot to Pin #10 (VSEN). Well, that's it and you've finished the VCore and OVP mods.
VDroop-Mod
As many of you already know, the DFI board has some quite high VCore fluctuations under load. That's why some smart guys figured out a VDroop-Mod for this board, to reduce
those fluctuations.
This mod is rather delicate as you need to remove 3 SMD/SMT resistors on the board in a cramped area and replace them by SMD/SMT resistors of different values.
The resistors, marked in the pic, need to be removed and then you solder in one of the SMD/SMT 4.7K resistors in each of the marked locations.
I'd advise you to order more than just the three needed resistors, as you may need to try that mod more than once before you succeed. Sometimes one or two resistors get
damaged (due to overheating or whatever), so be sure to have a replacement!
VDD-Mod
Datasheet of the chip:
www.national.com/ds/LM/LM158.pdf
Connect the middle pin of the 50K potentiometer to Pin #6 (Inverting Input B) of the LM358 chip. Then connect the potentiometer's outer contact to Pin #4 (Ground/GND).
The measuring point for VDD is located in the top right corner of the pic. It's the right leg of the VDD mosfet.
VDimm-Mod
Datasheet of the chip:
www.semtech.com/pdf/sc2616.pdf
The middle pin of the 100K potentiometer normally would need to be connected to SC2616's Pin #1 (FB). But as the chip has very tiny legs/contacts, that would be nearly impossible to do with normal equipment. Thus we trace pin #1 to a SMD/SMT resistor just next to the chip (marked in the pic). Now you need to connect the potentiometer's middle pin to the side of that resistor, facing the greenish capacitor next to it, as seen in the pic. After that you have to connect the outer pin of the potentiomter to Ground. Just like when doing the VCore-/OVP-Mod, I used an empty solder pad ("EC57") as Ground. Again, it was planned to be used for a cap and was then left empty in the final product (see the pic for details). Measuring point for Vdimm is on the second mosfet from the left, under the RAM slots. Make sure to take a look at the pic for the correct leg, as it depends on how your board is placed on the table. That way, you can't go wrong.
