Introduction

W1zzard · 06-28-2008, 04:38 PM

Introduction

This voltmod applies to all HD 4850 series cards using PCB #B50131-00.

The HD 4850 supports very limited voltage control via BIOS or software, only up to 1.20V

Disclaimer:
Performing these voltmods will void any and all warranties your video card may have.
You - and only you - are responsible for any damage caused indirectly (or directly) by these modifications.

Overview

GPU Voltage Mod (soldering)

GPU Voltage Mod (pencil)

You have to do only one of those mods, depending on the voltage you want to achieve.

This first voltage mod is easy to do but will not give you much more than about 1.4V on VDDC.

If you need more than 1.4V you should do above voltmod. Please note that you have to paint on the PCB between the two solder dots. Since this is more difficult we recommend the first pencil mod for smaller voltage increases.

Memory Voltage Mod (soldering)

Memory Voltage Mod (pencil)

boogerlad · 06-28-2008, 11:50 PM

wizzard, is the smd capacitor that you are showing on the vgpu voltage mod ground?

Scrizz · 06-29-2008, 08:10 AM

newtekie1 · 06-29-2008, 08:17 AM

How are the overclocking results with these mods? Does it help the poor overclocking issues any?

W1zzard · 06-29-2008, 11:29 AM

the big yellow cap on the left side of the vgpu mod is gnd

Kaleid · 06-30-2008, 02:06 AM

I'm thinking about doing the pencil mod (for the first time since the days of Duron)
I'd like to have a bit more information if possible.

1. What kind of pen to use?
2. How much do you shade with the pen?
2.5 As I've understood the more shade the less resistance and thus higher voltage. Correct?
3. Do I need a Digital Multimeter to measure the VDC+resistance (I'd rather not at all)
4. Do I need to download a new firmware to the card? If so, then where? (Ordered a Sapphire 4850)

Thank you for your hard work

calvary1980 · 06-30-2008, 02:07 AM

#2 pencil and a multimeter.

- Christine

Kaleid · 06-30-2008, 02:18 AM

Thanks for the replies. I guess I have to chicken out then...

scamps · 06-30-2008, 11:45 AM

Thank you, W1zzard!

Is there already any software to manipulate the VGPU under Windows when I have done this Voltmod? Or is it necessary to flash the bios for each alteration?

HeLLscream · 07-06-2008, 03:51 PM

Thank you so much.I searched a lot this.

ViciousXUSMC · 07-07-2008, 09:01 AM

Just connect the two solder dots the pencil point is pointing at to short that out? Seems easy enough, but was wondering why only one picture actually shows a line drawn between the points? I guess it has something to do with the "paint"?

Anyways wonderful guide!

W1zzard · 07-07-2008, 09:26 AM

the line in the picture is to clarify that you have to pencil between the points across the pcb. usually you pencil on a component like a resistor

ViciousXUSMC · 07-07-2008, 03:08 PM

Thats what I thought, thanks for clerifing.

Im dead in the water right now with both my 4850's I think a bad bios flash, or corrupted drivers. O a combo of both the bios flash made the drivers go fubar.

DavyGT · 07-16-2008, 02:02 PM

I know that this is an ubernoob question, but how do I measure the VGPU voltage? I'm guessing it doesn't matter where the + and - leads go, just at one any one of the points. Am I correct?
Can someone also post some benches of their new overclocks as well?

ShadowFold · 07-16-2008, 02:03 PM

What kind of pencil would I need to do a pencil mod?

DavyGT · 07-16-2008, 02:16 PM

Quote:

Originally Posted by ShadowFold

What kind of pencil would I need to do a pencil mod?

A good 2B or 4B pencil. I used my Faber Castell 2B pencil. Strangely enough, my 4B pencil doesn't decrease resistance at all, only adds to it, so always have an alternative at hand.

W1zzard · 07-16-2008, 04:13 PM

Quote:

Originally Posted by DavyGT

I know that this is an ubernoob question, but how do I measure the VGPU voltage? I'm guessing it doesn't matter where the + and - leads go, just at one any one of the points. Am I correct?
Can someone also post some benches of their new overclocks as well?

you put the red probe to the measure point and the black probe to any ground which could be case metal, molex connector black cable, pcie power plug gnd or a million other spots. the grounds are all connected with each other

boogerlad · 07-18-2008, 02:20 AM

another uber noob question: how much wattage for the resistor? i found various 100k ohm variable resistors, but they come in different wattages.

LifeOnMars · 07-21-2008, 08:29 AM

Any ideas on how long the pencil would stay on there for once modded? Never done this before and don't want to have to keep applying every two weeks, thanks.

LifeOnMars · 07-21-2008, 10:36 AM

so for that first pencil mod are we putting it on top of that one already filled or the empty one next to it?

LifeOnMars · 07-21-2008, 01:40 PM

no worries, all sorted. Now at 790/1180 stable

£117 quid well spent

yanahs · 07-23-2008, 09:42 AM

hi guys.. quick question if I use the first pencil mod.. which only alows 1.4 volts (no more).. does that mean i can actually just pencil as much as I want without worrying overvoltage? (no need a dmm)?

tomcug · 07-23-2008, 07:01 PM

Yes, I think you can't kill your card with the first pencil mod, but everything depends on your cooling. If you have a good aftermarket cooler, you don't have to worry about anything. But if I were you, I wouldn't do this without DMM.

yanahs · 07-24-2008, 05:53 AM

I got an accelero on it and i get 38 ide 45 load.. what do you think sufficient?

tomcug · 07-24-2008, 01:43 PM

If you have Accelero S1 on it, then you can try that pencil mod. But remember to check temperatures all the time, especially #2.

06-28-2008, 04:38 PM	#1
W1zzard Administrator Join Date: May 2004 Location: Stuttgart, Germany Posts: 7,609 (3.77/day) Thanks: 79 Thanked 2,485 Times in 931 Posts System Specs	Radeon HD 4850 Voltmods Introduction This voltmod applies to all HD 4850 series cards using PCB #B50131-00. The HD 4850 supports very limited voltage control via BIOS or software, only up to 1.20V Disclaimer: Performing these voltmods will void any and all warranties your video card may have. You - and only you - are responsible for any damage caused indirectly (or directly) by these modifications. Overview GPU Voltage Mod (soldering) GPU Voltage Mod (pencil) You have to do only one of those mods, depending on the voltage you want to achieve. This first voltage mod is easy to do but will not give you much more than about 1.4V on VDDC. If you need more than 1.4V you should do above voltmod. Please note that you have to paint on the PCB between the two solder dots. Since this is more difficult we recommend the first pencil mod for smaller voltage increases. Memory Voltage Mod (soldering) Memory Voltage Mod (pencil) Last edited by W1zzard; 06-28-2008 at 06:14 PM.

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06-29-2008, 08:10 AM	#3
Scrizz Join Date: Aug 2007 Location: Brandon, FL, US Posts: 1,870 (2.28/day) Thanks: 414 Thanked 212 Times in 200 Posts System Specs	thx __________________ ~Scrizz Protected, Mother Approved~ My Heatware

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06-28-2008, 11:50 PM	#2
boogerlad Join Date: Jun 2006 Posts: 87 (0.07/day) Thanks: 5 Thanked 4 Times in 4 Posts	wizzard, is the smd capacitor that you are showing on the vgpu voltage mod ground? Last edited by boogerlad; 06-30-2008 at 04:40 PM.

06-29-2008, 08:17 AM	#4
newtekie1 Semi-Retired Folder Join Date: Nov 2005 Location: Indiana Posts: 8,723 (5.98/day) Thanks: 320 Thanked 1,419 Times in 1,169 Posts System Specs	How are the overclocking results with these mods? Does it help the poor overclocking issues any? __________________ Rig1: System Specs. Rig2: Xeon X3220@3.0GHz / P5N-E SLI / 2GB G.Skill DDR2-800 4-4-4-12 / eVGA GTX260 / Samsung DVD-Burner / 300GB WD + 2x1.5TB Seagate LP in RAID0 Rig3: Athlon X2 4200+ / M4A79 Deluxe / 4GB G.Skill Pi DDR2-800 4-4-4-12 / XFX HD4890 1GB / Sony DVD-Burner / 250GB Seagate Rig4: C2DE2180@3.3GHz / Asus P5B / 2GB G.Skill DDR2-800 4-4-4-12 / eVGA 8800GTS 320MB / Samsung DVD-Burner / 80GB Seagate

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06-29-2008, 11:29 AM	#5
W1zzard Administrator Join Date: May 2004 Location: Stuttgart, Germany Posts: 7,609 (3.77/day) Thanks: 79 Thanked 2,485 Times in 931 Posts System Specs	the big yellow cap on the left side of the vgpu mod is gnd

06-30-2008, 02:06 AM	#6
Kaleid Join Date: Jun 2008 Posts: 53 (0.10/day) Thanks: 2 Thanked 7 Times in 5 Posts System Specs	I'm thinking about doing the pencil mod (for the first time since the days of Duron) I'd like to have a bit more information if possible. 1. What kind of pen to use? 2. How much do you shade with the pen? 2.5 As I've understood the more shade the less resistance and thus higher voltage. Correct? 3. Do I need a Digital Multimeter to measure the VDC+resistance (I'd rather not at all) 4. Do I need to download a new firmware to the card? If so, then where? (Ordered a Sapphire 4850) Thank you for your hard work

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Video Card:	Sapphire 4770 @ 910/1200 AC S1 modded + 600rpm fan
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06-30-2008, 02:07 AM	#7
calvary1980 Banned Join Date: Dec 2007 Location: Toronto, CA Posts: 1,603 (2.30/day) Thanks: 1,948 Thanked 315 Times in 282 Posts System Specs	#2 pencil and a multimeter. - Christine

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06-30-2008, 02:18 AM	#8
Kaleid Join Date: Jun 2008 Posts: 53 (0.10/day) Thanks: 2 Thanked 7 Times in 5 Posts System Specs	Thanks for the replies. I guess I have to chicken out then...

06-30-2008, 11:45 AM	#9
scamps Join Date: Oct 2006 Posts: 3 (0.00/day) Thanks: 2 Thanked 0 Times in 0 Posts	Thank you, W1zzard! Is there already any software to manipulate the VGPU under Windows when I have done this Voltmod? Or is it necessary to flash the bios for each alteration?

07-06-2008, 03:51 PM	#10
HeLLscream Join Date: Jul 2008 Posts: 1 (0.00/day) Thanks: 0 Thanked 0 Times in 0 Posts	Thank you so much.I searched a lot this.

07-07-2008, 09:01 AM	#11
ViciousXUSMC Join Date: Jul 2008 Posts: 106 (0.21/day) Thanks: 3 Thanked 14 Times in 13 Posts System Specs	Just connect the two solder dots the pencil point is pointing at to short that out? Seems easy enough, but was wondering why only one picture actually shows a line drawn between the points? I guess it has something to do with the "paint"? Anyways wonderful guide!

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07-07-2008, 09:26 AM	#12
W1zzard Administrator Join Date: May 2004 Location: Stuttgart, Germany Posts: 7,609 (3.77/day) Thanks: 79 Thanked 2,485 Times in 931 Posts System Specs	the line in the picture is to clarify that you have to pencil between the points across the pcb. usually you pencil on a component like a resistor

07-07-2008, 03:08 PM	#13
ViciousXUSMC Join Date: Jul 2008 Posts: 106 (0.21/day) Thanks: 3 Thanked 14 Times in 13 Posts System Specs	Thats what I thought, thanks for clerifing. Im dead in the water right now with both my 4850's I think a bad bios flash, or corrupted drivers. O a combo of both the bios flash made the drivers go fubar.

07-16-2008, 02:02 PM	#14
DavyGT Join Date: Apr 2008 Location: Australia Posts: 66 (0.12/day) Thanks: 9 Thanked 13 Times in 12 Posts System Specs	I know that this is an ubernoob question, but how do I measure the VGPU voltage? I'm guessing it doesn't matter where the + and - leads go, just at one any one of the points. Am I correct? Can someone also post some benches of their new overclocks as well?

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07-16-2008, 02:03 PM	#15
ShadowFold Eligible for custom title Join Date: Dec 2007 Location: Omaha, NE Posts: 12,847 (18.38/day) Thanks: 1,380 Thanked 1,665 Times in 1,495 Posts System Specs	What kind of pencil would I need to do a pencil mod? __________________ Heatware STEAM - Xfire TechPowerUp Xfire Group Warcraft Server, Thorium Brotherhood: HORDE! Vredesbyrd - 80 Balance/Resto Druid - Shaidov - 47 Holy/Ret Paladin - Arntor - 70 Unholy/Frost Death Knight

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07-18-2008, 02:20 AM	#18
boogerlad Join Date: Jun 2006 Posts: 87 (0.07/day) Thanks: 5 Thanked 4 Times in 4 Posts	another uber noob question: how much wattage for the resistor? i found various 100k ohm variable resistors, but they come in different wattages.

07-21-2008, 08:29 AM	#19
LifeOnMars Join Date: Jun 2008 Location: Dorset, UK Posts: 449 (0.87/day) Thanks: 128 Thanked 41 Times in 39 Posts System Specs	Any ideas on how long the pencil would stay on there for once modded? Never done this before and don't want to have to keep applying every two weeks, thanks.

07-21-2008, 10:36 AM	#20
LifeOnMars Join Date: Jun 2008 Location: Dorset, UK Posts: 449 (0.87/day) Thanks: 128 Thanked 41 Times in 39 Posts System Specs	so for that first pencil mod are we putting it on top of that one already filled or the empty one next to it?

07-21-2008, 01:40 PM	#21
LifeOnMars Join Date: Jun 2008 Location: Dorset, UK Posts: 449 (0.87/day) Thanks: 128 Thanked 41 Times in 39 Posts System Specs	no worries, all sorted. Now at 790/1180 stable £117 quid well spent

07-23-2008, 09:42 AM	#22
yanahs Join Date: Jul 2008 Posts: 21 (0.04/day) Thanks: 8 Thanked 0 Times in 0 Posts System Specs	hi guys.. quick question if I use the first pencil mod.. which only alows 1.4 volts (no more).. does that mean i can actually just pencil as much as I want without worrying overvoltage? (no need a dmm)?

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07-23-2008, 07:01 PM	#23
tomcug Join Date: Jan 2008 Posts: 91 (0.13/day) Thanks: 2 Thanked 16 Times in 15 Posts System Specs	Yes, I think you can't kill your card with the first pencil mod, but everything depends on your cooling. If you have a good aftermarket cooler, you don't have to worry about anything. But if I were you, I wouldn't do this without DMM.

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07-24-2008, 05:53 AM	#24
yanahs Join Date: Jul 2008 Posts: 21 (0.04/day) Thanks: 8 Thanked 0 Times in 0 Posts System Specs	I got an accelero on it and i get 38 ide 45 load.. what do you think sufficient?

07-24-2008, 01:43 PM	#25
tomcug Join Date: Jan 2008 Posts: 91 (0.13/day) Thanks: 2 Thanked 16 Times in 15 Posts System Specs	If you have Accelero S1 on it, then you can try that pencil mod. But remember to check temperatures all the time, especially #2.

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