ATI 4850/4870 voltmod thread

I would have used that first pin and middle one, so resistance drops (=Vgpu increases) when turned clockwise.
Pretty strange tho...

Another Pic
Attachment 94557

Yes I understand, how You soldered it.
So You turned it to the end in clockwise?

When i touched the wire coming from FB to VR actually have 99k between FB and GND and must nothing happened(only when start turns VR) , but the card is shut down like a protection thing

yes i turned it to the end in clockwise.

No one wanna help me out with the HIS Iceq4 4850 1gb?

any idea ceemic?

dragubogdan, I don't know; it's pretty strange...
Try bigger VR?

its me mario, please post macro-pictures from PMW area and IC.

Thanks for helping me out, really appreciate it!

So I took these pics with a 8 year old camera thats worth about 3 bucks now. It took 46 tries to get a couple decent pics:mad:

Anyway here ya go!:welcome:

http://s680.photobucket.com/albums/vv166/IR0BI/


I think the last pic is the best btw.

I've been through the last 10-15 pages and have been googling my ass off, anybody got a vmod for the Sapphire HD4850 dual slot thingie? I need it badly, and fast, if there is one already, if there isn't I'll cancel my order.

EDIT: Or am I right when I think this is the 4850 mod: http://www.xtremesystems.org/forums/...postcount=1006 ? It could be the 4870 as well, I don't have any Sapphire cards in front of me right now, so I can't tell really. Appreciate some help on this. :)

its me mario, it should be pin13 to GND. First trace where it heads to find a good soldering point. Measure default resistance between pin13 and GND.

Mean Machine, it should have that most common IC (uP62....) so it's easy to do Vmod...

Great, thanks for the answer. I'm worthless at finding vmods myself, I'll have to start looking in to that. :)

A Sapphire HD4850 Dual-slot version ordered.

Quote:

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Originally Posted by ceemic

its me mario, it should be pin13 to GND. First trace where it heads to find a good soldering point. Measure default resistance between pin13 and GND.

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I just moved so I don't have a soldering iron. Any temporary pencil mods I could do?

thanks for the help!

With the pencil mod for the non reference sapphire 4870 the vcore went from 1.32 to 1.34 lol

Look at this bull sh*t!

http://www.evga.com/articles/00462/default.asp?gvt=1

me r mad:mad:

I can't seem to find the UP6201BQ datasheet anywhere, if anyone could tell me where I'd need to solder the resistor I'd be grateful.

Mean Machine, yes I know this datasheet can't be found. But it is basically the same as NX2420: http://ceemic.pri.ee/hardware/datasheets/NX2420.pdf
So pin13 is FB.

Quote:

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Originally Posted by ceemic

IT WORKS :D :cool:
http://ceemic.pri.ee/hardware/hd4850_2/hd4850_mod.JPG

So I used 20k VR and Vgpu rised pretty lot (I used ATi Tray Tools to adjust Vgpu and render 3D):

Before Vmod:
1,044@ATT -> 1,209V/1,322V (2D/3D)
1,158@ATT -> 1,339V/1,328V

After Vmod:
1,044@ATT -> 1,268V/1,386V
1,158@ATT -> 1,405V/1,392V


http://ceemic.pri.ee/hardware/hd4850...850_mod01v.jpg http://ceemic.pri.ee/hardware/hd4850...850_mod03v.jpg
http://ceemic.pri.ee/hardware/hd4850...850_mod04v.jpg http://ceemic.pri.ee/hardware/hd4850...850_mod05v.jpg
:cool:

EDIT: I recommend a switch for 24/7 use, because 20k VR rised Vgpu a little bit too much and it boosts GPU temp! PWM and PCB temp even more!

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This mod works great on the EAH4830 as well, since it shares the same PCB. Thanks!

--Matt

mattkosem, nice to know :)

Quote:

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Originally Posted by ceemic

Mean Machine, yes I know this datasheet can't be found. But it is basically the same as NX2420: http://ceemic.pri.ee/hardware/datasheets/NX2420.pdf
So pin13 is FB.

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Thanks!

Just my last idiot question then, before I actually can start feeling like I've thought something right for the first time; just pin 13 to ground with a 100k VR and from there it's the regular stuff?

Sorry, I've just never had to think of Vmodding, since I usually don't really care about the graphics cards. :)

Mean Machine, measure default resistance before moding! The resistance may vary through different layouts.

Quote:

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Originally Posted by ceemic

Mean Machine, measure default resistance before moding! The resistance may vary through different layouts.

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Of course, of course. I just took the 100k as an example as it's "default". :)

Big thanks for all the answers.

EDIT: Resitance between pin 13 and ground is 5.8kOhm, should anybody be interested.

Then 100k VR works fine :)

Where do you guys find your VR's?