ATI 4850/4870 voltmod thread

[makaka]

there is no known pencil mod for the card , go with hard mod for stable voltage

[Blazing fire]

Hi there! I have not vmod anything in my life so I'm a complete noob at this.

I currently have a HIS 4870, blue PCB and probably referenced design. Just to confirm, is this techpower voltmod guide applicable to me? And how does one change and monitor the voltage, like makaka did?

edit- what about this one? http://sandwichamwin.blogspot.com/20...ng-hd4870.html

[Goldlocke]

@ blazingfire: Take a look at your card. Does it sport 1 or 2 "VT1165" regulator chips? If yes, you won' t need a hardmod. Just use software described here

[Goldlocke]

@ Syl & Vatos Locos: Thank you both mates! I used your hardmod to rise the VGPU on my Sapphire blue HD4870 512MB non-reference.
Right now I am @

GPU 935MHz / Mem 975MHz 3DMark Vantage stable @ VGPU 1.47V

still testing...

[TI66ER]

I am looking for a vmod for my asus 4870 512mb dark knight,not top version.Without looking through loads of pages here,does anybody know if there is one in this thread please.It is this one-



If there is not onw in here anywere,i will try and get some close up pics of were ever they need to be of.

I think its using this voltage controller-ADP3290
http://www.onsemi.com/PowerSolutions...ADP3290JCPZ-RL

thanks

TI66ER

[jfer]

Hi, everyone!

Could any of you tell wheres the vmod-points so that I can solder a tripot for vcore and vmem?

My card is the PowerColor PCS HD4850 1GB

And here are the photos of the beast, taken upclose:

Front: LINK
Back: LINK


Many thanks in advance!

[Vatos_locos]

Goldlocke lucky b my card cant go more than 880mhz even with 1.5vgpu

[sofos1990]

haha you're lucky.Mine couldn't do 880Mhz core...only 870Mhz with 1.5V on dice for 3DMark06

[Vatos_locos]

bad luck ? or bad cards on Greece bro

[sofos1990]

Maybe you're right!!! BUT hipro's one could do 1100Mhz core But ok he is a moder from another planet
BTW some photos from mine card moded

[makaka]

i got 3 card Palit HD 4870 and all of them do 900 mhz stable @ 1.4-1.5v , the best one did 980 Mhz under water with 1.6v and passed 3d mark vantage , all those card are sold now i keep my old HD 4870 which also rock solid @ 900 mhz , can do higher but i am already happy with the current result
@Blazing fire

And how does one change and monitor the voltage, like makaka did

I jsut plugged a multimeter to the card and changed the VR ,

[Theorw]

Hello guys!
I am relatively new here but i have some experience on ocing though.Anyway today i added a 2nd 4850 1gig but for my bad luck,it was the sapphire DUAL SLOT and not the reference that i expected...(which i have pencil modded to 821/1200 along with a musashi cooler)
What i need is for someone that really knows this thread,to point me to the page of the pencilmod of DUAL SLOT sapphire 4850 if possible cos 64 pages are a bit hard to look into..!
Thanks in advance!!

[celemine1Gig]

You go here

http://www.xtremesystems.org/forums/...o_threadsearch (it is the "search this thread" function)

and then type in "Sapphire". And then after a few minutes of reading you will probably find what you are looking for.

[Theorw]

For the owners of the DUAL SLOT 4850 that vmod their cards,i d like to remind that the MEM VRMs should be cooled too!
I find that in both reference and custom PCBs the mem vrms are ignored but if u put a sink on them u llbe surprised how hot it gets!!
I put one in my reference and now in my DUAL SLOT for peace of mind!
I also added vMEM measuring points.
Hope to be of help here!

[Tomasz25]

Hi All

Could you please help me and confirmed which resistor should I use 50K or 20K

this one?


or this one?


thank you

[ceemic]

Tomasz25, the bigger VR You use, the safer it is. You have to measure def resistance to calculate the best value You could use...

[celemine1Gig]

1.) Tomasz25, the bigger VR You use, the safer it is. 2.) You have to measure def resistance to calculate the best value You could use...

Sorry to disagree with 1.), but that is not always true! As I already explained once or twice before, potentiometers tend to be highly non-linear in the lower resistance ranges. That means that for example when a 50K VR set to its max resistance and you want to have a a resistance decrease of ~5K, then you'll have to turn the screw more often than in case the VR was already preset to for example 10K before.
For vmodding a higher resistance rated poti with the same number of turns means having less precision for higher voltages. And that also increases the likeliness of killing hardware, due to overvoltage, as the resistance drops faster in the lower ranges.
It's always a tradeoff between precision in the higher voltage (lower resistance) ranges and higher default voltage with the variable resistor set to its max. A way around that "problem" BTW is using potentiometers connected in series.

The problem described aabove is the reason why the second part of your statement is the most important.

[ceemic]

celemine1Gig, yes ofcourse. You are right as usual
I just wasn't specific with my post. I meant for 24/7 "jump". If he has intentions to do extreme OC with high Vcore, then lower VR is more suitable, as You already said.

[Tomasz25]

Thanks for your advices, I think I will start with 50K and I will see what results I will be able to get

[Theorw]

Noob question but i was wondering,what would happen if,in this card
http://img35.imageshack.us/i/back1v.jpg/
whos PCB has 8pin connector design but instead only a 6pin is used,
someone soldered a 12v cable+a ground to each free spot.???
What would happen?
Should the card get more current?Overheat?Become more OCable???

[Vatos_locos]

it wont make any deference i think those pads are connected together.
you wont gain more oc it will probably drain more current but wont make a big deal

Tomasz25 use one 50k it will be more precise

[Mrazaq]

Hello, can you please help me which resistor to pencil on the Gigabyte HD4850 (zalman, 512MB) ? I took some pictures, .
Thanks in advance!

[celemine1Gig]

celemine1Gig, yes ofcourse. You are right as usual
I just wasn't specific with my post. I meant for 24/7 "jump". If he has intentions to do extreme OC with high Vcore, then lower VR is more suitable, as You already said.

Hehe, I know that you already knew and what you meant to say. It's just that I myself had to learn the hard way, killing some hardware before really starting to think about the problem. That's why I like to emphasize it, in oder to keep others from making the same mistake. I can tell you, you feel really dumb after having killed a graphics card's memory, due to overvoltage, just because you did't think about the effect, that I described. You then know that you could very well still have a fully functioning video card if you were not that dumb. The positive effect, though, is that you definitively learn it this way.

[rastaman]

hi guys,

ive read/googled/ the forums but cannot find the right resistor to "pencil" to 0.9 ohm.

ive already edit the bios with the ati editor (techpowerup) to the max that was possible (1.158 V) -- and reached 770 / 1003
with the 0.9 ohm i want to pencil it to ... 1.3 V.

its a

powercolor 4830 512mb

and the chip (vmod for gpu) is a

uP6201BQ
VLP88N

pic // backside:
Powercolor 4830
512mb ddr3

maybe someone of you can help me out.

thanks in advance.
rastaman


http://www.abload.de/image.php?img=img_2327lzsc.jpg
[img=http://www.abload.de/thumb/img_2327lzsc.jpg]

[Theorw]

Can anyone point me to the DUAL SLOT 4850 voltmod,the ONE WITH THE VR please not pencil...Thanks in advance!