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HD5870 Voltmod non-reference (blue PCB)

post #1 of 44
Thread Starter 

Hi.
My name is Yordi.
I resently did a volt mod on my videocards, because there is no possible way to overvolt by software.
I have made some pictures of the volt-mod and some data to show you how i did it.
I have two Sapphire HD5870 Vapor-X O.C. cards in crossfire.
They are cooled by the EK FC5870 V2 (Water cooling).

The temp of the cards at full load is max 49 C.
At stock voltage i can overclock these cards at max 950/1250.
This is how the PCB looks like.
Front:

Back:

I measured the voltages and the resistance of my cards.
GPU1 : idle v-gpu 1.035 v idle v-memory 1.608 v load v-gpu 1.204 v load 1.619 v.
GPU2 : idle v-gpu 0.951 v idle v-mem 1.597 v load v-gpu 1.136 v load 1.615 v.
On the fb of the up6213 i measured 5.02 kohm.
On the imax/ocp of the up6213 i measured 10.03 kohm

On the fb of the up6101 i meadured 5.02 kohm.

So i want to tune the resistance down of both the FB`s so the voltage of the mem and gpu will rise.
Data up6213 :



Edited by lampje - 8/25/13 at 10:53am
post #2 of 44
Thread Starter 

Data up6101:


I used 3 100kohm VR`s for each card to do the job.

If you are going to use them start at 100k and slowly tune the resistance, because if you start at 0 the chip is dead.
GPU V-MOD:
Set to +- 100kohm i measured a resistance of 4.85kohm.

Tune down the the resistance slowly and measure the voltage.

OCP-MOD:
Set to +- 100kohm i measured a resistance of 9.85kohm (0.302v).
I tuned the resistance down to 5.02kohm (0.181v).

MEM V-MOD:
Set to +- 100kohm i measured a resistance of 4.81kohm.

Tune down the resistance slowly and measure the voltage.

After building it in it looks like this .


If you use this do it at your own risk, don`t blame me if enything goes wrong.


Edited by lampje - 8/25/13 at 10:50am
post #3 of 44
Yes, 5k x 20 = 100K VR to be used.

Also, here is the uP6101 datasheet.

When you get one of the cards removed, go ahead and take some more pics of the full card, front and back.
    
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post #4 of 44
Thread Starter 
Thanks.

I have to let the water out for more pictures, but i will search the internet for some better pictures.
Today i bought some more 100k trimpotmeters, so when i deside to do the voltmod i will make pictures of everything.
post #5 of 44
Thread Starter 
Can some one also tell me what i can reach with overcloking the v-pcie?
post #6 of 44
Quote:
Originally Posted by lampje View Post
Can some one also tell me what i can reach with overcloking the v-pcie?
Do you mean OCing the PCI bus or overvolting the votlage from the PCI lane?
    
CPUMotherboardGraphicsRAM
E8400, E8600, 980BE T2RS+, P5E3, TA890FXE 8800GTS's,GTX's,GS,Ultra's,9600GT Lots of D9's and some crap DDR3 
Hard DrivePowerCase
Seagate 250GB + 80GB WD for benching TT 875w, Corsair 650TX Custom bench station 
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CPUMotherboardGraphicsRAM
E8400, E8600, 980BE T2RS+, P5E3, TA890FXE 8800GTS's,GTX's,GS,Ultra's,9600GT Lots of D9's and some crap DDR3 
Hard DrivePowerCase
Seagate 250GB + 80GB WD for benching TT 875w, Corsair 650TX Custom bench station 
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post #7 of 44
Thread Starter 
I saw this.

Why should i overvolt the vpci-e, what can i reach with it?
post #8 of 44
It has been said to help increase GPU/MEM OC's, but I've yet to see any benefit from it.
    
CPUMotherboardGraphicsRAM
E8400, E8600, 980BE T2RS+, P5E3, TA890FXE 8800GTS's,GTX's,GS,Ultra's,9600GT Lots of D9's and some crap DDR3 
Hard DrivePowerCase
Seagate 250GB + 80GB WD for benching TT 875w, Corsair 650TX Custom bench station 
  hide details  
Reply
    
CPUMotherboardGraphicsRAM
E8400, E8600, 980BE T2RS+, P5E3, TA890FXE 8800GTS's,GTX's,GS,Ultra's,9600GT Lots of D9's and some crap DDR3 
Hard DrivePowerCase
Seagate 250GB + 80GB WD for benching TT 875w, Corsair 650TX Custom bench station 
  hide details  
Reply
post #9 of 44
Thread Starter 
If there is no possible bennefit, ill just stick with the mem and gpu voltage.
What do you think of my last drawing with the vr`s, should it look something like that?
post #10 of 44
Thread Starter 
Cant wait , i am going to let the water out to mod one of the cards.
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