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Sapphire blue PCB (5830/5850/5870) pencil mod found (by me ;D) - Page 6

post #51 of 81
Thread Starter 
The lower the resistance between those two points the higher the voltage to the core. Do not short them with a direct connection with wire however as your card will either cut out to protect itself or fry the core.
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post #52 of 81
Meaker, which pins do I have to connect for the mem voltage?
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post #53 of 81
Thread Starter 
I have not looked into the memory voltage to be honest, there is the hardware mod for a variable resistor in the xtreme systems thread.

Mine clocks to 1375 to 1400mhz at stock volts so I decided that was enough.
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post #54 of 81
Nice job mate! Just one question, what's the normal "life" for these pencil mods? like said before there is a certain danger in the graphite blowing off from the air flow(high around the gpu area in my case) Additionally, the vGPU mod you posted, is that a working hard voltmod? I seem to be a bit confused.
Edited by B7ADE - 5/25/10 at 12:43am
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post #55 of 81
Thread Starter 
I borrowed the original picture from a hardware mod since I did not have the camera at the time.

This pencil mod would probably live for several months if you compress the track just right. I could not even remove it by blowing on it as hard as I could.
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post #56 of 81
Super! repped!
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post #57 of 81
Good work Meaker. I've got one of the sapphire rev 2 non reference 5850's, how much would this pencil mod increase my 3d load voltage too? Is it a case of more graphite = less resistance therefore higher voltage or just the fact of 'connecting' the points with any amount of graphite?

Also in your youtube vid you use a ground point on the card, I take it any ground point will do ie case or bracket of the card?

Thanks in advance
post #58 of 81
Hi folks!

So, if I got this right: I use the pencilmod on these to pins in the picture to lower the resistance by 5% from 50k to say 47,5k, right?
Does that mean the vgpu voltage gets upped by the same 5%?
And whats the vpgu measuring point for? I Probably have to check it against ground, right? But does it display a direct Voltage reading (like 1,175v from the gpu) or Resistance (like again the 50k Ohm)?

Thanks in advance, and great mod!!
post #59 of 81
Quote:
Originally Posted by K404 View Post
Graphite conducts *slightly* so if you shade across a resistor, it sets up a parallel resistor network, which is the exact same as soldering a potentiometer across the ends of the resistor.... BUT pencil is cruder, with less control + precision, and can be affected by nearby airflow... ie... the graphite gets blown away.

Heavier shading decreases resistance, hence increases voltage.
You can get pretty fine control with harder lead, and you can tape up the area afterwards. I prefer to use a razor fine tip to shade the side/corner of the appropriate resistor and avoid putting graphite on any surface facing directly up (as that's what the tape sticks to).

I've had pencil mods on some cards last upwards of two years without issue.

Quote:
Originally Posted by gaddster View Post
Good work Meaker. I've got one of the sapphire rev 2 non reference 5850's, how much would this pencil mod increase my 3d load voltage too? Is it a case of more graphite = less resistance therefore higher voltage or just the fact of 'connecting' the points with any amount of graphite?

Also in your youtube vid you use a ground point on the card, I take it any ground point will do ie case or bracket of the card?

Thanks in advance
It's variable, depending on how much graphite is deposited.

You do not want to completely short the points, that will kill the card.
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post #60 of 81
Here's a thing, I just measured the vMem and vGPU volts under idle and load prior to doing anything and I got

vGPU: 1.000v idle - 1.188v load (OCCT)
vMEM: 1.605v idle - 1.609v load

Not surprising then that my card (and many others) clocks pretty well to 875/1200 without doing anything. It's a blue PCB Sapphire 5850 rev 2.

Think I might leave modding it for now, real world it's fine as it is and the potential gains don't outweigh the risks as I can see.
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