ATI 3850/3870 Voltmod thread

[Vatos_locos]

yes i made the same mistake i feed the 3850's mem's with ~4Volts and the card blowed up just unmod her and send her for rma

[fng77]

yes i made the same mistake i feed the 3850's mem's with ~4Volts and the card blowed up just unmod her and send her for rma

wow thats alot.

I think that I totaly grounded one of the green spots, wonder what happens when you do that?

[Vatos_locos]

if you just ground the spots you feed the core with as much volt the pwm can supply
normally the card due to overvoltage/overcurent protection should just shut down the core but this is happening in a small amount of voltage in your case the voltage that went to the core when you ground the spots is unknown so it might made a damage to the core (degrade maybe ?) so just un-mod the card and make sure that every thing is clean and send her for rma

i did my best to explain everything, i hope you can read all this my English sucks

[fng77]

if you just ground the spots you feed the core with as much volt the pwm can supply
normally the card due to overvoltage/overcurent protection should just shut down the core but this is happening in a small amount of voltage in your case the voltage that went to the core when you ground the spots is unknown so it might made a damage to the core (degrade maybe ?) so just un-mod the card and make sure that every thing is clean and send her for rma

i did my best to explain everything, i hope you can read all this my English sucks

No worries. I think your english is very good. Thanks for your answer, guess I have to take a brake from Far Cry tonight

[Random Murderer]

This is how my screen look right now:

she's dead. my x800xt did the same thing when i clocked it too far. the only way to fix it is to rma it.

[fng77]

she's dead. my x800xt did the same thing when i clocked it too far. the only way to fix it is to rma it.

Rest in peace dear Sapphire 3870

[Menhir]

This is how my screen look right now:

I've a 3850 with similar stripes....when i boot i get stripes of green dots

but my card was not realy dead...when i pressed at some points of pcb it worked sometimes fore a couple of days without the green stripes

i think on my card something has no real contact to pcb or the pcb has an internal cut or something of a memory chip has no real contact...

but i'll send it to RMA

it was not my pencil vmod caused this kind of problems

[fng77]

I have written a little poem:

Dear 3870

You served me for many months and never complaind about the the too strong vcore. As long as you could hang out with your pal AC S1 you were always happy. Your pcb was blue as heaven itself and your Caps were oh so solid. As time went by we learnd to live side by side. You with your 1000 Mhz Gpu and me with my playful mood. But one day I accedently grounded one of your mod-points and your gpu turned black as the night. You screamed
for a short while and then it got silent...

Now you can play all the games you want and meet with other 3870:s and maybe even a 3850. I know this was your dream, to engage x-fire with a red pcb 3850 to share your workload. Dont forget to use double bridges in that case.

You will always be rememberd.

[fng77]

[Norway]

You swedish people ()

[fng77]

He, he

[Vatos_locos]

[todda7]

I have written a little poem:

Dear 3870

You served me for many months and never complaind about the the too strong vcore. As long as you could hang out with your pal AC S1 you were always happy. Your pcb was blue as heaven itself and your Caps were oh so solid. As time went by we learnd to live side by side. You with your 1000 Mhz Gpu and me with my playful mood. But one day I accedently grounded one of your mod-points and your gpu turned black as the night. You screamed
for a short while and then it got silent...

Now you can play all the games you want and meet with other 3870:s and maybe even a 3850. I know this was your dream, to engage x-fire with a red pcb 3850 to share your workload. Dont forget to use double bridges in that case.

You will always be rememberd.

OMFG.. Thats beautiful

[Factotum]

This is how my screen look right now:

I had this the same. My HIS3870 died in my eyes during the evening. But: I took 3870 to specialists, they have to fry card into the IR-furnace. Now I have all excellent

[Factotum]

voltmod made HIS3870ICeQ3
After a couple of seconds in 3D-mode, voltage chip falls from 1.46 to 1.15 V
What's wrong?

[[XC] gomeler]

I have written a little poem:

Dear 3870

You served me for many months and never complaind about the the too strong vcore. As long as you could hang out with your pal AC S1 you were always happy. Your pcb was blue as heaven itself and your Caps were oh so solid. As time went by we learnd to live side by side. You with your 1000 Mhz Gpu and me with my playful mood. But one day I accedently grounded one of your mod-points and your gpu turned black as the night. You screamed
for a short while and then it got silent...

Now you can play all the games you want and meet with other 3870:s and maybe even a 3850. I know this was your dream, to engage x-fire with a red pcb 3850 to share your workload. Dont forget to use double bridges in that case.

You will always be rememberd.

Great stuff, I am sure your HD3870 appreciated this. I simply muttered "piece of garbage" as I shipped off my 4 dead cards

[Eldonko]

voltmod made HIS3870ICeQ3
After a couple of seconds in 3D-mode, voltage chip falls from 1.46 to 1.15 V
What's wrong?

OCP on the HIS, once you raise the vgpu past 1.4v OCP kicks in and drops the voltage to 1.15v when you run 3D. I think that is what those extra couple resistors are doing when you compare to reference.

One thing you can try tho is a different BIOS. GeCube and Sapphire BIOS supposedly allow for more than 1.4v but I havent tried em personally. I always get the dam checksum error and am not sure how to change that.

[Factotum]

OCP

Sorry, but what's this? The hard-lock...? If true, how to get rid?

[Factotum]

I'm find it's:
R40, R41 - remove
R42, R43 - remove and replace to 300K Ohm
May be do it for HIS? but where the resistors on PCB from HIS?

[Eldonko]

Sorry, but what's this? The hard-lock...? If true, how to get rid?

Over current protection. The card kicks back to 1.15v if a certain voltage threshold is passed.

According to shamino's pic, the resistors are here:



But I would try a different BIOS before doing this..

[Factotum]

Over current protection. The card kicks back to 1.15v if a certain voltage threshold is passed.
According to shamino's pic, the resistors are here:

I'm do it tomorrow evening

[Factotum]

This work for HIS3870ICeQ3:

[Eldonko]

You tested it?

[OneyedK]

I'm trying to voltmod a RX3850, pcb rev. 2.0.

The PWM regulator is an RT8802A, really could use some help.

[Eldonko]

whitepaper pdf for that PWM. Can we see the rest of the card?