this is a Vgpu mod for a gts 250

i don't remember what vr i have uset. i think 50K,but for this card i have a fan conector for switching vr's

Edited February 2, 201411 yr by skulstation

a smal up date whit bater photo of the gpu chip " up6206ak vcz96a "

and i think i have found the mem chip to mod " up6281s8 vgp979 "

but i can not find a datasheet at the moment.

if somwane have a id which pin is needed let it plz know,

or how to prep this gpu for epower and co

Edited January 6, 201510 yr by skulstation

wrong "pwm" for DDR:D

uP6181 are 12v mosfet drivers with output disable for a single phase synchronous-rectified buck converter!

 

ddr pwm are located on the front pcb , right from speaker(buzz1)

Edited January 6, 201510 yr by nachtfalke

wrong "pwm" for DDR:D

uP6181 are 12v mosfet drivers with output disable for a single phase synchronous-rectified buck converter!

 

ddr pwm are located on the front pcb , right from speaker(buzz1)

 

thx for the info.

i can not read the text on the chip.

this is the only chip on the right site from the speaker.

Edited January 6, 201510 yr by skulstation

yes, he is the ddr pwm

 

i don´t have the card here , but should be uP6101 or APW7065 both with FB to pin6

 

-please measure if the pin 3 on that pwm is GND

-then measure the pin6 (FB ) to GND ..that resistence x20 = VR value , 20k VR should be

Edited January 6, 201510 yr by nachtfalke

pin 3 is GND and from GND to pin 6 i have 583 ohm

yes, 20k VR from pin6 to GND is OK , if you have 10K VR also is good!! it is uP6101 pwm , if you have ~900ohm from pin 6 to GND is APW7065

 

ddr voltage check points you get from capacitors left from black choke!

Edited January 6, 201510 yr by nachtfalke

thx for the help.

tomorrow i gone search if i have a 10k.

and so not ist conrad time

good look with your 3d test:)

vmod for the mem is working, whit a 20K i have 2.16V.thad is +0.06V above stock

is ther an other place to conect a vr for the gpu?

my conection came lose and can not conact agen on the same plase

Edited January 7, 201510 yr by skulstation