Radeon HD 4850 Voltmods

W1zzard · Jun 28, 2008, 03:38 PM

To read this article go to: http://www.techpowerup.com/articles/...g/voltmods/151

boogerlad · Jun 28, 2008, 10:50 PM

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

Scrizz · Jun 29, 2008, 07:10 AM

thx

newtekie1 · Jun 29, 2008, 07:17 AM

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

W1zzard · Jun 29, 2008, 10:29 AM

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

Kaleid · Jun 30, 2008, 01:06 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 · Jun 30, 2008, 01:07 AM

#2 pencil and a multimeter.

- Christine

Kaleid · Jun 30, 2008, 01:18 AM

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

scamps · Jun 30, 2008, 10:45 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 · Jul 6, 2008, 02:51 PM

Thank you so much.I searched a lot this.

ViciousXUSMC · Jul 7, 2008, 08:01 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 · Jul 7, 2008, 08:26 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 · Jul 7, 2008, 02:08 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.

Jul 16, 2008, 01:02 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 · Jul 16, 2008, 01:03 PM

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

Jul 16, 2008, 01:16 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 · Jul 16, 2008, 03:13 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 · Jul 18, 2008, 01:20 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 · Jul 21, 2008, 07:29 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 · Jul 21, 2008, 09:36 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 · Jul 21, 2008, 12:40 PM

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

£117 quid well spent

yanahs · Jul 23, 2008, 08:42 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 · Jul 23, 2008, 06:01 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 · Jul 24, 2008, 04:53 AM

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

tomcug · Jul 24, 2008, 12:43 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.

Jun 28, 2008, 03:38 PM	#1
W1zzard Benevolent Dictator Join Date: May 2004 Location: Stuttgart, Germany Posts: 13,793 (4.18/day) Thanks: 184 Thanked 10,293 Times in 3,176 Posts System Specs	Radeon HD 4850 Voltmods To read this article go to: http://www.techpowerup.com/articles/...g/voltmods/151 Last edited by W1zzard; Jun 28, 2008 at 05:14 PM.

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Jun 29, 2008, 07:10 AM	#3
Scrizz Join Date: Aug 2007 Location: Brandon, FL, US Posts: 2,129 (1.01/day) Thanks: 728 Thanked 292 Times in 267 Posts System Specs	thx __________________ ~Scrizz Protected, Mother Approved~

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Jun 28, 2008, 10:50 PM	#2
boogerlad Join Date: Jun 2006 Posts: 193 (0.08/day) Thanks: 13 Thanked 12 Times in 11 Posts	wizzard, is the smd capacitor that you are showing on the vgpu voltage mod ground? Last edited by boogerlad; Jun 30, 2008 at 03:40 PM.

Jun 29, 2008, 07:17 AM	#4
newtekie1 Semi-Retired Folder Join Date: Nov 2005 Location: Indiana Posts: 17,765 (6.48/day) Thanks: 780 Thanked 5,119 Times in 3,709 Posts System Specs	How are the overclocking results with these mods? Does it help the poor overclocking issues any? __________________ Rig1: System Specs. Rig2: A8-5600K@4.4GHz / AsRock FM2A75 Pro4 / 8GB Corsair DDR3-1600 9-9-9-24 / HD7560D / Samsung DVD-Burner / 1.5TB WD Green + 3x3TB WD RED in RAID5 Rig3: Athlon X2 4200+ / M4A79 Deluxe / 4GB G.Skill Pi DDR2-800 4-4-4-12 / GT430 / Sony DVD-Burner / 500GB WD Rig4: Phenom II x6 1605T @ 3.6GHz / Asus M5A99X Evo / 8GB PNY DDR3-1600 9-9-9 / GTX470 & GTX470 / Samsung DVD-Burner / 1.5TB Seagate

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Jun 29, 2008, 10:29 AM	#5
W1zzard Benevolent Dictator Join Date: May 2004 Location: Stuttgart, Germany Posts: 13,793 (4.18/day) Thanks: 184 Thanked 10,293 Times in 3,176 Posts System Specs	the big yellow cap on the left side of the vgpu mod is gnd

Jun 30, 2008, 01:06 AM	#6
Kaleid Join Date: Jun 2008 Posts: 116 (0.06/day) Thanks: 3 Thanked 16 Times in 8 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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Jun 30, 2008, 01:07 AM	#7
calvary1980 Banned Join Date: Dec 2007 Location: Toronto, CA Posts: 1,602 (0.81/day) Thanks: 1,948 Thanked 319 Times in 286 Posts System Specs	#2 pencil and a multimeter. - Christine

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Jun 30, 2008, 01:18 AM	#8
Kaleid Join Date: Jun 2008 Posts: 116 (0.06/day) Thanks: 3 Thanked 16 Times in 8 Posts System Specs	Thanks for the replies. I guess I have to chicken out then...

Jun 30, 2008, 10:45 AM	#9
scamps Join Date: Oct 2006 Posts: 30 (0.01/day) Thanks: 14 Thanked 13 Times in 9 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?

Jul 6, 2008, 02:51 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.

Jul 7, 2008, 08:01 AM	#11
ViciousXUSMC Join Date: Jul 2008 Posts: 106 (0.06/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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Jul 7, 2008, 08:26 AM	#12
W1zzard Benevolent Dictator Join Date: May 2004 Location: Stuttgart, Germany Posts: 13,793 (4.18/day) Thanks: 184 Thanked 10,293 Times in 3,176 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

Jul 7, 2008, 02:08 PM	#13
ViciousXUSMC Join Date: Jul 2008 Posts: 106 (0.06/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.

Jul 16, 2008, 01:02 PM	#14
DavyGT Guest Posts: n/a (0/day)	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?

Jul 16, 2008, 01:03 PM	#15
ShadowFold Eligible for custom title Join Date: Dec 2007 Location: Omaha, NE Posts: 12,855 (6.49/day) Thanks: 1,381 Thanked 1,681 Times in 1,498 Posts System Specs	What kind of pencil would I need to do a pencil mod?

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Jul 18, 2008, 01:20 AM	#18
boogerlad Join Date: Jun 2006 Posts: 193 (0.08/day) Thanks: 13 Thanked 12 Times in 11 Posts	another uber noob question: how much wattage for the resistor? i found various 100k ohm variable resistors, but they come in different wattages.

Jul 21, 2008, 07:29 AM	#19
LifeOnMars Join Date: Jun 2008 Location: Kettering,Northants. UK Posts: 2,242 (1.25/day) Thanks: 1,718 Thanked 401 Times in 337 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.

Jul 21, 2008, 09:36 AM	#20
LifeOnMars Join Date: Jun 2008 Location: Kettering,Northants. UK Posts: 2,242 (1.25/day) Thanks: 1,718 Thanked 401 Times in 337 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?

Jul 21, 2008, 12:40 PM	#21
LifeOnMars Join Date: Jun 2008 Location: Kettering,Northants. UK Posts: 2,242 (1.25/day) Thanks: 1,718 Thanked 401 Times in 337 Posts System Specs	no worries, all sorted. Now at 790/1180 stable £117 quid well spent

Jul 23, 2008, 08:42 AM	#22
yanahs Join Date: Jul 2008 Posts: 21 (0.01/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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Jul 23, 2008, 06:01 PM	#23
tomcug Join Date: Jan 2008 Posts: 98 (0.05/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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Jul 24, 2008, 04:53 AM	#24
yanahs Join Date: Jul 2008 Posts: 21 (0.01/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?

Jul 24, 2008, 12:43 PM	#25
tomcug Join Date: Jan 2008 Posts: 98 (0.05/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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