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Please help me identify and voltmod (pencil) the 4850 Powercolor 512MB DDR3

bernek

bernek

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Apr 9, 2009
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System Specs
System Name N/A
Processor Phenom 9500 @ 2.6 GHz
Motherboard Asus M2N32SLI-Deluxe
Cooling Thermaltake BigWater 735 + additional rad+fan
Memory 4 x 1 GB DDR2 Geil 800 MHz
Video Card(s) Powercolor Play 4850 512MB DDR3 @ 770/1000 MHz / aircooled
Storage 320GB Seagate SATA2 / 320GB Maxtor IDE
Display(s) ASUS MB19TU
Case UTT
Audio Device(s) Creative Audigy 2 ZS
Power Supply Sirtec 550W SLI Ready / 3 rails 12V
Software Vista 64 bit SP2 / Windows 7 build 7068 / Catalyst 9.4
Benchmark Scores 3DMark2006 - 12-13K
I have a Powercolor 4850 512MB.

I found some vmods (pencil and hardmods) but they dont seem to match my PCB. I attached 2 pictures overview and one a zoomed in to the voltage points.

Sorry for the quality ... this is the best I can obtain using my smoker hand

http://www.popsoft.ro/1.jpg - just overview

http://www.popsoft.ro/2.jpg - this is the ZOOM in pic

Thank you !

Bernek
 
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I've seen the voltmod on powerup forums but the pcb of the card there is not 100% close to mine :) I've read that thread and checked if my card matches but it doesnt.

I took a close picture where the vmod should be made and the resistor that needs to be penciled doesnt correspond to mine.

I was curious if someone knew how that microchip works and point me to the resistor that needs to be penciled.
 
i see. That is a pretty darn good zoom you have on your camera. I wish i could be of more help. :(
 
WhiteLotus said:
i see. That is a pretty darn good zoom you have on your camera. I wish i could be of more help. :(
Click to expand...

considering the neon lighting and I smoke 2 packs / day ... lol and my hand shakes like I'm connected to the AC plug.

I took the picture in super macro mode few centimeters away that is the answer :) the camera is an Olympus SP510 UZ.
 
bump.

nobody vmoded the Powercolor 4850 ? :P

If annyone has a card like this or knows how vmod please leave me a message ! Thanks.
 
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seems like I'm doomed with 700 mhz on this thing :( its bad because I know it can go higher but volts are not enough ...

temps are very nice 68-70 under full load tested with furmark for 1 hour max settings stability test.

I hate powercolor for their non reference pcb already ...

I attached the PDF for the compact dual phase synchronous rectified buck controller is you guys don't have it yet: http://www.popsoft.ro/uP6201.pdf

my card has the: uP6201BQ / QFN 4x4-24L without droop function
 
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doing some research on my own maybe I can figure it out !

any help would be appreciated !
 
First of all I would like to thank Ceemic (from XS) for explaining me how the controller works.

I dont think a pencil mod is correct and pencil between to points is not a stable mod imho. I have the datasheet for that IC.

I think the best way to mod is hardmod with a resitor and variable resistor attached in order to be 100% safe. (so no matter what vr you use the resistance will still be there)

Here is the pdf for that chip:

http://www.popsoft.ro/uP6201.pdf

Lowering the resistance on pin - 13 FB Feedback Voltage.

This pin is the inverting input to the error amplifier. A resistor divider from
the output to AGND is used to set the regulation voltage. Use this pin in combination with the COMP pin to compensate the voltage control feedback loop of the converter.

I measured a resistance of 2.9 Kohms there. (FB to ground)

I will mod the card tomorrow and hope to get 850 MHz on core or at least 800 MHz.
 
cool let us know how it goes. :)
 
I did voltmod the card (hardware mod) and also changed cooling. Will post pictures and results later :) so far I'm at 790 MHz core going for 800+ when I will get my waterpump back :D
 
Have been following this thread. Must post pics and how-to! Hard to find an actual guide for this card. Oh and CONGRATS on the 790 and possible 800+. :)
 
bernek said:
I did voltmod the card (hardware mod) and also changed cooling. Will post pictures and results later :) so far I'm at 790 MHz core going for 800+ when I will get my waterpump back :D
Click to expand...

good effort!
 
I have this card, too, and I've been really hoping to see a guide on how to vmod it. Any pics to share?
 
I have this card too, i hope you'll show us your vmod...I'm looking for guide or something but i didn't find.
 
Hi, i have a 4830 powercolor and it's look like 4850 powercolor (well it's the same in fact)..Anyone can help me?
Here my pcb:
my.php

On chip is written: P6201BQ VLP86H
my.php


So i found the fb pin (thanks Bernek) but a i dont think the next resistor after the FB pin is the good (i tried the pencil and result was blue screen and reboot)
 
i'm waiting for bernek but i found a system for this vmod, maybe the same bernek's mod. I post this week end a picture
 
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