ATI 4850/4870 voltmod thread

[DJSUB]

same things happens to me even without changing the max clock slider in RBE.

recently i tried changing the max clock slider to 950/1350 without hash. i could boot to windows but it didnt install the driver correctly.

last month i tried flashing the original bios (stock core & mems speed) of my gecube then install the newer driver.
then i tried ocing the card to 725/1000+mhz mem clock using CCC. it work flawlessly in that speed.
from what i saw, you can oc'ed your vc to ccc's limit. you can also set that max clock in RBE without problem.
i only use stock fan that time. i will try to do that again but this time i will try higher coreclock in ccc

[leoy]

I also have the Asus 4850 custom pcb.
Because i didn't understant where i have to do the pencil mod, can i have some confirmation?
I measured the resistance and is indeed 1kΩ.

Where i have brown colour, i need to shade with the pencil? in between ?

[ceemic]

leoy, yes, You are right

[leoy]

leoy, yes, You are right

Did it and it works nicely...
Took the resistance down to .96 and now i am 1.38 by ddm full load at furmark(almost 60 degrres temp)... Seems stable at 750..
I have a scythe musashi cooler...
Should i go for more?? Or it would be a bad move?

[ceemic]

For 24/7 I wouldn't recommend...

[leoy]

I just tested 1.42 load( took the resistance down to .925) .
Stable 800(too bad ccc stops there )
Temps max at 60's....
Something that worries me is that deafult i was reading 1.31 with the dmm at load.1.26 idle. Is it because it is asus custom?

And i took it down to 1.39v is this safe with temps under 60?

[rahul5]

my 4850 read 1.18v at load at defaulr resistance of 1.85kohm ,reduced it to 1.22 vcore went up to 1.30-1.31max with clock speed max
stable at around 765mhz .anything above that causes catalyst 8.11 to crash or game crash. overdrive takes it ip to 790mhz stable.well i am not able to increase voltage in bios above 1.158(max in RBE) as it causes windows to not able to boot upto desktop screen.Anything for that and how much is safe resistance (and voltage)that can be dropped upto for safe use.

[DARLINGTON]

my 4850 read 1.18v at load at defaulr resistance of 1.85kohm ,reduced it to 1.22 vcore went up to 1.30-1.31max with clock speed max
stable at around 765mhz .anything above that causes catalyst 8.11 to crash or game crash. overdrive takes it ip to 790mhz stable.well i am not able to increase voltage in bios above 1.158(max in RBE) as it causes windows to not able to boot upto desktop screen.Anything for that and how much is safe resistance (and voltage)that can be dropped upto for safe use.

supports 3dMark 2006???

Regards

[rahul5]

very much

[roger_h99.nor]

Not game stable at all, off course. Can play Warhead at 950 though.
Memory freaks out before 1 Ghz.
VGPU at 'only' 1.35. Will try to push it to 1.40.
I'm not particulary skilled at OC, so this card must be awsome

[andL64]

any pics on modding gainward HD4870 GS 1024mb (with 2x2phase design) ?

help appreciated...

[JimmyH]

I haven't got time to mod my Asus, but friend of mine gave me his two Gainward HD4850 512MB Golden Sample




Other pics: http://ceemic.pri.ee/hardware/hd4850gs/

Def Vgpu changed (idle/load) 1,194V/1,214V -> 1,207V/1,221V

Greetings. I have Palit 4850 sonic. The PCB looks identical to this gainward card. I need help to do a pencil mod on it. Is this possible at all? Thanks.

[ceemic]

JimmyH, not sure. Try to search GND points other side resistors marked with green: http://ceemic.pri.ee/hardware/hd4850gs/hd4850gs_04m.jpg

[gamervivek]

is there a 4850 bios compatible with newer drivers that has >800Mhz overdrive limits? currently overclocking with ati tray tools and the gains from oc aren't much better than with CCC and lower clocks.

[JimmyH]

Hi,
Ok thanks. How do i comfirm a point is ground? check resistance to the 8pin connector ground on the other side???

[ceemic]

JimmyH, Yes.

[raibemunn]

What are the current clock limits of the Cat8.11 with 4850?

[Solarfall]

What are the current clock limits of the Cat8.11 with 4850?

well persomally i cant even overclock my 4850 with the newer catalyst drivers i've tryed every ocing software that i know still no go.. swiched back to the 8.10 and im able overclock it normally..weird thing

[DJSUB]

well persomally i cant even overclock my 4850 with the newer catalyst drivers i've tryed every ocing software that i know still no go.. swiched back to the 8.10 and im able overclock it normally..weird thing

what's your highest overclock in catalyst 8.10?

thanks!

[Solarfall]

what's your highest overclock in catalyst 8.10?

thanks!

im still testing the highest possible clocks but so far with 1.5v i've able to get the gpu to 940mhz (3d stable)

[raibemunn]

lol, well, thats way above what im trying to achieve.
can i start with 100k vr with gigabyte 4850?

[DJSUB]

im still testing the highest possible clocks but so far with 1.5v i've able to get the gpu to 940mhz (3d stable)

is it hardmodded? what cooling do you use?

thanks!

[Solarfall]

is it hardmodded? what cooling do you use?

thanks!

yep its hard modded i used just a simple watercooling rig.. my temps stay around 35c under load

lol, well, thats way above what im trying to achieve.
can i start with 100k vr with gigabyte 4850?

yes i also have gigabyte card that i volt modded and i also used 100vr like the many guides suggest

[DJSUB]

yep its hard modded i used just a simple watercooling rig.. my temps stay around 35c under load




yes i also have gigabyte card that i volt modded and i also used 100vr like the many guides suggest

wow thats great!
what are the things i need for watercooling the vc?
i'm sorry very noob about that

thanks

[Solarfall]

wow thats great!
what are the things i need for watercooling the vc?
i'm sorry very noob about that

thanks

well i personally have a eheim 1250 pump.. tube like reservoir ( cant remember whos the manufacturer is ) D-tek fusion gpu block, and 240mm rad+ i use 12mm tubing