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Sapphire 5770 Vmod needed :D (HD pics + Datasheet included)

post #1 of 8
Thread Starter 
Hi all.

Now I love my 5770, however nothing can overvolt it frown.gif. AB, Trixx, the lot don't work. I can hit some damn nice OC's at stock volts, 980/1370 for benching. I did a quick 3DM11 and got 3196 @ 980/1350.

However I want more, I would like to pencil mod the card to run a higher voltage. Below is a pic of the vGPU controller and here is a link to the controllers data sheet. Help me OCN, I want to pencil mod it, if I need a DMM I can borrow one from school tomorrow.

Cheers, + REP to anyone who helps smile.gif

[IMG]dscf0382lk.jpg Uploaded with ImageShack.us
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post #2 of 8
Thread Starter 
Cmon OCN, BUMPAGE
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post #3 of 8
Datasheet for IC is here

VFB = your pin for GPUv mod... trace it to nearest resistor and measure resistance value at stock

ILIM = Current Limit / OCP
IMON = related to OVP/OCP

.. Personally I wouldnt shove much more than 1.38v to the core.. anything much beyond that..and you had better be -0.

* I run only 1.35v for 1185mhz on my 5770, using water. I have done an excessive amount of mods to get it there though redface.gif

P1070870.jpg
post #4 of 8
Thread Starter 
Quote:
Originally Posted by CL3P20;15602716 
Datasheet for IC is here

VFB = your pin for GPUv mod... trace it to nearest resistor and measure resistance value at stock

ILIM = Current Limit / OCP
IMON = related to OVP/OCP

.. Personally I wouldnt shove much more than 1.38v to the core.. anything much beyond that..and you had better be -0.

* I run only 1.35v for 1185mhz on my 5770, using water. I have done an excessive amount of mods to get it there though redface.gif

P1070870.jpg

OK thanks, I'll borrow a DMM from school tomorrow smile.gif, Would I need to be lowering the resistance or increasing it from stock?
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post #5 of 8
*check and make note of stock resistance value to ground

*solder in VR and check connections for continuity

*measure and set VR back to stock resistance value

*power up GPU.. checking power [unplug HDD so you stay in BIOS.. this should show full 3d boot voltage]

*tune VR while GPU is powered... slowly ..while monitoring voltage realtime with DMM

*start with a .1v increase for air cooling...and find your new stable limit and max temps

*if temps under full load are still below ~65c.. you have more headroom for speed/voltage

*Commence having fun... now tongue.gif


--good luck wink.gif Post some results and pics of your endeavors!
post #6 of 8
Thread Starter 
Cheers, more reps for you good sir.

Resistance between the FB pin (nearest resistor to it) and the ground on the PCI-E power cable is 7.11Kohm. What VR would I need to order then? Sorry for noob questions redface.gif
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Swag box m8
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CPUMotherboardGraphicsRAM
2500K Asus P8P67 Sapphire HD 5770 2x8GB Corsair 1333MHz 
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post #7 of 8
*one thing first-

a resistor for 'FB' mod will always tone and measure to FB on one side.. and tone/measure to ground on the other.

-To calculate VR size.. the formula is [20x OEM resistance, measured at 'FB'] = VR required

= ~142k ohms ... a 150k ohms VR should do the trick wink.gif
post #8 of 8
Thread Starter 
Quote:
Originally Posted by CL3P20;15620620 
*one thing first-

a resistor for 'FB' mod will always tone and measure to FB on one side.. and tone/measure to ground on the other.

-To calculate VR size.. the formula is [20x OEM resistance, measured at 'FB'] = VR required

= ~142k ohms ... a 150k ohms VR should do the trick wink.gif

Cheers smile.gif
Swag box m8
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7 x BL460c
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CPUMotherboardGraphicsRAM
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Case
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  hide details  
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Swag box m8
(13 items)
 
7 x BL460c
(6 items)
 
 
CPUMotherboardGraphicsRAM
2500K Asus P8P67 Sapphire HD 5770 2x8GB Corsair 1333MHz 
Hard DriveMonitorMonitorPower
Corsair Force 3 120GB Aoc F22S+ Aoc F22S+ Powercool 850W 80+ 
Case
NZXT Phantom 
CPUCPUMotherboardRAM
Xeon E5520  Xeon E5520  BL460c G6 12GB ECC DDR3 
Hard DriveOS
1TB of SAN Server 2008 R2 
  hide details  
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