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Old 12-28-2012, 12:12 PM
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Question Need help Powercolor 3870x2 DDR4 non-reference volt mods.

Good Day , i would like to know if someone is able to help me do a complete volt mod on my Non reference Powercolor 3870x2 DDR4 , this one http://www.newegg.com/Product/Produc...82E16814131100 , its huge in size and DDR4 special edition , its a non reference Gigauntous PCB , Huge size card pcb with an extra small pcb inside too :/ , for the life of me i cannot figure out the volt mods myself since this is a non reference Frankestein monster card and very different from the normal 3870x2 DDR3. I have always done all the VGAs volt mods myself but for the life of me im unable to do this one. This VGA Its one of a kind and only a small run of this cards were ever made , i spent 9 months looking for one and finally i found only one , brand new unopen virgin card , it was from a small online store going out of bussiness , so its a unique hard to find , if not immposible video card. Let me know if you guys can help me to do all the volt mods on my card v.core ,v.mem and anything else you guys can do to this card to get it running 1000+ core , it will be run on chilled water -12c since i cannot mount LN2 gpu pots on it , let me know if you guys can help me out , any help , guidance and helpful informatiom will be greatly apretiate it . thank you in advanced.

kind regards:Angelo

pictures of it here: ( if you guys need better pictures and close ups let me know )














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Old 12-28-2012, 01:41 PM
Bobnova Bobnova is offline
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I think I see the controller peaking out from under the MOSFET heatsink.
A closeup of that controller will give us something to start on.
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Old 12-28-2012, 06:53 PM
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Thank you Bonnova ,Ok here we go more pictures provided.

, fnally after removing the cooler i see the extra pcb is for an extra DVI and HDMI connectors on the card. If you need original photos they are huge in size 3264x2448 i can only send it over email to you due to the size in a compress archive if needed. Let me know if you want me to read the little ics numbers to see if we can find data sheets on them , there are so many :/. Memory is Samsung 819 K4U523240E 8C08


























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Old 12-28-2012, 07:09 PM
Bobnova Bobnova is offline
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The square black chip just peaking out from under the heatsink on the back end of the card is the character we need to see, I think.
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Old 12-28-2012, 11:30 PM
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Quote:
Originally Posted by Bobnova View Post
The square black chip just peaking out from under the heatsink on the back end of the card is the character we need to see, I think.
will post more pics tomorrow , thank you
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Old 12-29-2012, 11:12 AM
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IC Number: ON NCP5388 G5AB0750G



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Old 12-29-2012, 02:01 PM
Bobnova Bobnova is offline
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A simple VR mod on the FB pin will get you at least 150mV extra. To go beyond that is somewhat more complicated due to OVP. How far beyond that you can go before the MOSFETs go blam is hard to say, it doesn't seem like an overly juicy power section for two cores, but I guess 3870s are only ~105w to begin with.

Here's the datasheet:
http://www.onsemi.com/pub_link/Collateral/NCP5388-D.PDF

From reading the datasheet:
For mods beyond the OVP point you'll need to attack the VS+ pin (#15). If the resistance of 15 to GND is higher than ~15-20 ohms you can go the standard VR route with it. If it's less than that you'll need to find the resistor between that pin and the inductor output sides, odds are it'll be next to the controller chip. That resistor will need to be replaced with something high enough that you can VR it without things melting.

For OCP, connect pin12 to pin13.

As always your mileage may vary, void where prohibited by law, results not typical, and any other disclaimer that comes to mine :P
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Old 01-25-2013, 09:55 AM
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Thank you for the help Bobnova , apretiate it. Mods will be done.
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Old 02-06-2014, 09:40 AM
kyledavid kyledavid is offline
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Great! posting of picture. I love these pictures.
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Old 02-13-2014, 11:08 AM
zzolio zzolio is offline
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you can make a vid mod then you can run up to 1.7V 1.6V form vid and 0.1 from FB mod
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