ATI 3850/3870 Voltmod thread

[Jimbo Mahoney]

Not normally. People have been running 1.9v without problems.

Hehe what do you know, I think my 3850 also has OCP /OVP (OVP I think).

It works fine at 1.5v but as soon as it reaches 1.55v, it drops to 0v and the screen goes black.

My card is a Triplex 3850 512MB using a Nexsem 2415:

http://www.nexsem.com/pdfs/2415DS.pdf



The blue circled resistor is connected to pin 8 (OCP) of the 2415. If I remove this resistor, I'm assuming it will remove the OCP? Looking at the section in the PDF, it seems increasing the resistance of this resistor will increase the OCP point, so removing it will do the trick?

EDIT - Removing this resistor did nothing at all. Card is fine and OCP still functions

[spookywillow]

Hehe what do you know, I think my 3850 also has OCP /OVP (OVP I think).

It works fine at 1.5v but as soon as it reaches 1.55v, it drops to 0v and the screen goes black.

My card is a Triplex 3850 512MB using a Nexsem 2415:

http://www.nexsem.com/pdfs/2415DS.pdf



The blue circled resistor is connected to pin 8 (OCP) of the 2415. If I remove this resistor, I'm assuming it will remove the OCP? Looking at the section in the PDF, it seems increasing the resistance of this resistor will increase the OCP point, so removing it will do the trick?

EDIT - Removing this resistor did nothing at all. Card is fine and OCP still functions

my card is the triplex 3870 and has the same layout as this, is the any way to do the pencil mod on this card?

[spookywillow]

sorted my triplex 3870, shading resistor R650 which is right above the resistor with the single green dot on in the pic. initial resistance is 7.14ohms giving 1.3v, dropping that to 7.00 ohms gave 1.37v