ATI 3850/3870 Voltmod thread

[chp]

atitool .27 b4 works for me. 3850

http://www.techpowerup.com/wizzard/ATITool_0.27b4.exe

It Works???

Everytime I try to apply the new values (0.27b3 or 0.27b4) the system crashes. I have a Connect3D 3850 512MB.

It work only if I use it in conjunction with RT 206, not alone.

Else, Someone has the resulting values from the 100K VR?

[JamesBong420]

yup it works for me. make sure you have "if card has 2d 3d clocks,switch to 3d..." is checked and suspend while ATItool is running resume on quit. in the HD 2000 overclocking section. which is in settings. i know dont make any sense but i hope that helps..

[chp]

Unfortunately it doesn't.

Could it be a conflict with CCC?
Perhaps I missed something?

[Sage]

bring on the VMEM damnit! i gotta see 1400Mhz at least!

[afireinside]

So does anyone know what the VGPU would start at if I were to use a 50k VR?

[jimmyz]

So does anyone know what the VGPU would start at if I were to use a 50k VR?

about 1.42
use two and set them both too the max.

[oanvoanc]

i dont know at which voltage it would start.

but i tested both:

2x50k ohm and 1x100k ohm set to the max.
both result in 1,08v 2d and 1,24v 3d.

(measured on two power color hd 3850

[afireinside]

about 1.42
use two and set them both too the max.

Thanks. I'd use 2 but I only have 2 of them on hand and I have 2 3870s

[gurusan]

I have a Powercolor 3850 512mb and my PCB looks different than those I see pictured in this thread. However, I shaded the circled resistor and managed to get my core to 1012mhz stable Temps don't go over 47c load but I am on water.

The thing is, I don't know what voltage I am running...Can anyone tell me where to measure my vGPU?

[largon]

gurusan,
There are several vGPU measuring points in the pic you posted.
All those metallic spots on the bright red area on the far right side of your pic are vGPU measuring points.

[os008]

So, i got the courage yesterday to do the volt-mod, and i did, and after much testing, i reached a stable 859/999 at 1.4v, max temp of 75c at a 60% fan duty.

Had a lot of trouble getting a cool idle temp with RivaTuner, or even ATI Tool, so i just editted the BIOS of the card to clock itself to 859 on load, and it worked ... no more manual overclock and above all 35c idle temp .

Just waiting now for Stilt's BIOS, wonder why he's taking so long to post it 0.o

[gurusan]

gurusan,
There are several vGPU measuring points in the pic you posted.
All those metallic spots on the bright red area on the far right side of your pic are vGPU measuring points.

Which ones in particular? I've tried all them but they give bogus readings like .8 and 1v

So, i got the courage yesterday to do the volt-mod, and i did, and after much testing, i reached a stable 859/999 at 1.4v, max temp of 75c at a 60% fan duty.

Had a lot of trouble getting a cool idle temp with RivaTuner, or even ATI Tool, so i just editted the BIOS of the card to clock itself to 859 on load, and it worked ... no more manual overclock and above all 35c idle temp .

Just waiting now for Stilt's BIOS, wonder why he's taking so long to post it 0.o

Congrats!!

On a side note...I just did a 3dmark06 run and got 14,815

http://service.futuremark.com/compare?3dm06=4210636

[HousERaT]

any pencil mods for the 3870?

[gurusan]

any pencil mods for the 3870?

Is it not the same as the 3850?

[os008]

On a side note...I just did a 3dmark06 run and got 14,815

http://service.futuremark.com/compare?3dm06=4210636

You can run at 1GHz? how? can you share your BIOS with us please?


EDIT: OH, nevermind, thought you had 256MB version, just saw your sig again.

Thanks.

[gurusan]

Well I was being stupid before and those metal points certainly are vGPU measure points.

I was at 1.84v :p I have no problem pushing limits but even that is a bit roasty for me on a 55nm process, watercooling or not. So I've lowered clocks to 840mhz.... 1.4v idle 1.5v load ....now temps are 29c idle 37c max load

Would like to figure out a gddr3 vdimm mod for this card, and once I've pushed the limits I will need a new toy :p

[os008]

What's the max safest voltage for 3850 please? or in general, what's the max voltage in % that most usually don't pass?

[LowRun]

Well I was being stupid before and those metal points certainly are vGPU measure points.

I was at 1.84v :p I have no problem pushing limits but even that is a bit roasty for me on a 55nm process, watercooling or not. So I've lowered clocks to 840mhz.... 1.4v idle 1.5v load ....now temps are 29c idle 37c max load

Would like to figure out a gddr3 vdimm mod for this card, and once I've pushed the limits I will need a new toy :p

Now that is some serious volts

[RealyPssd]

Is there any updates/word on when ATI Tool will be updated with s/w voltage control for the HD3xxx's yet?

[MsB]

Wow thats great gurusan I have two of those cards and I'm waiting for good overclocking tool for cf. I will try the pencil mod when one comes out. what water block are you using?

[LowRun]

Is there any updates/word on when ATI Tool will be updated with s/w voltage control for the HD3xxx's yet?

No other timeframe than "soon" was given but w1zzard also said that voltage control would be very limited unfortunately

[RealyPssd]

Does anyone know if you can adjust HD3xxx voltages with that new Phenom/790 Overdrive application since it is part of that spider platform?

[kemist]

Quick question, would this trimmer work for this mod?

Technical/Catalog Information 490-3009-ND
Standard Package 50
Category Potentiometers, Variable Resistors
Family Trimmers
Vendor Murata Electronics North America
Resistance In Ohms 100K

Power (Watts) 0.25W, 1/4W

Number of Turns 12

Package / Case Through Hole

Packaging Bulk

Adjustment Type Top Adjustment

Tolerance ±10%

Series PV37

Lead Free Status Lead free
RoHS Status RoHS compliant
Other Names 490-3009
490-3009-ND
PV37Y104C01B00

[Norway]

Havent testet it becuase 1350Mhz is more then enough for me

[Norway]

I have now pencil mod'd the vcore so the circuit is a total off 4.59Kohm, default is it 5.1Kohm

Hope some good results