ATI 4850/4870 voltmod thread

[largon]

That's vMEM. For some reason, which is now beoynd me, I assumed you were talking about vMEM pencil mod specifically...
Anyways, to even tell if vGPU pencil mod is possible I'd need a macro photo of the large'ish black rectangular chip labeled "L6713A" and it's immediate surroundings (area-of-interest greyed out in attached pic with the measuring points).

[mpc]

I'm looking for a V-mod for the Sapphire 4870 512MB and also the v-gpu points.




Any Idea?

Thanks!

[ceemic]

mpc, do a macro-pic from that marked area: http://ceemic.pri.ee/hardware/sapphire_hd4870.jpg
Seems the same layout and possibly the same IC also: http://ceemic.pri.ee/hardware/hd4870/hd4870_02.jpg
So there applies this guide: http://forums.techpowerup.com/showthread.php?t=65199
Soldering point is other side PCB, beneath the IC.
http://ceemic.pri.ee/hardware/hd4870/hd4870mod_01.jpg (the black wire in the left leads to Vgpu measure point)

[largon]

That's a plain-jane reference HD4870 albeit the blue color.

[SNiiPE_DoGG]

That's a plain-jane reference HD4870 albeit the blue color.

+1 that's a reference design so the standard techpowerup 4870 vmod guide will work for you

[mpc]

Thanks guys. I hope my card will run good under LN2

[gurusan]

Awhile back sapphire started releasing their 4870s with the new cooler (black one on top)...is this the exact same reference design?

[mpc]

Just rip that Stock-Cooler off und you will see

[gurusan]

I will once it comes

[ziggo0]

Awhile back sapphire started releasing their 4870s with the new cooler (black one on top)...is this the exact same reference design?

I have the Visiontek version of this card, 512mb though, it's definitely not ref design. I bought the right ohm pots just to find out when they got here i didn't have a reference design 4870 - anyone know of any guides for my card?

It is this one: http://www.newegg.com/Product/Produc...82E16814129113

The PCB appears to be like that 1gb Sapphire but it's not 1gb.

[mpc]

You need to post pics, so they we be able to find out where the vmod is.

[ziggo0]

Ok after I spent a lot more time researching it, it winds up being the non-reference as the Palit/Gainward, however I cannot find a volt mod for that either. I may be able to get pictures, I don't have a camera though, gotta wait for a friend to come over for those =(

[Gir92]

For people that have done it, how much does the 4870 vMEM pencil mod help?

Thanks.

[DemonEyez]

Ok after I spent a lot more time researching it, it winds up being the non-reference as the Palit/Gainward, however I cannot find a volt mod for that either. I may be able to get pictures, I don't have a camera though, gotta wait for a friend to come over for those =(

Hey, see posts 1317 to 1323.

[ziggo0]

Hey, see posts 1317 to 1323.

Hmmm, that makes a lot of sense now, sadly I only have 50k pots

[DuncanOc]

Hi guys,I have a Gigabyte HD4850 512MB,this one,and I am looking for a pencil mod

Here's the back of the card:

http://img266.imageshack.us/img266/4959/pict0031hw8.jpg

I need a safe 24/7 pencil mod

[ceemic]

DuncanOc, please do a closeup macro pic from the PWM area in the front of the card. Also from that 20pin IC (on the right of the green sticker in Your picture).

[ptys]

DuncanOc, please do a closeup macro pic from the PWM area in the front of the card. Also from that 20pin IC (on the right of the green sticker in Your picture).

hi, i need hard mod this card

[largon]

Either of you need to take a sharp macro pic of this area:



And post it here.

(...) Also from that 20pin IC (on the right of the green sticker in Your picture).

That's a Winbond chip. And Winbond doesn't make any PWM controllers.

[ceemic]

largon, tnx, I couldn't see the markings.
Yes, You pointed out the right place

[DuncanOc]

That chip next to the green sticker at the back of the card,in my card is the Gamer HUD chip.With that,I can overclock and overvolt(very little) the memory from a software called Gigabyte GAMER HUD.

The pic that I posted before is not mine.The only difference is that chip.

That chip in the front,its called NCP5392 and I found this pdf http://www.bdtic.com/DataSheet/ON/NCP5392.pdf

Sadly I dont have a digital cam,nor a multimeter at this time.

Sorry for my bad english

[ceemic]

DuncanOc, measure resistance between pin17 and GND

[ptys]

ceemic resistance pin17 and GND = 7,21 kiloOhm

[ceemic]

Use 200k or 100k VR for Vgpu mod

[ptys]

ceemic vfb+200k+GND= vgpumod?