How-to: Pencil mod your HD 3870!

sneekypeet · Jan 15, 2008

Tigger ,no BIOS mods correct ...to help Coldstorm answer his question ....this is all just Ocing with ATItool or Rivatuner, correct?

Cold Storm · Jan 15, 2008

Oh, I believe you all the way tigger that you did it and its at what it is... i'm just asking the reason on the jumper.... and if it was removed would the video card post or not... and we all have the right to do how we feel to our stuff. I'm just asking so in the future, if I wanted to do the same thing, then I know what would happen in case A and then case B..

Deleted member 24505 · Jan 15, 2008

It would still post with the jumper off,posting with the jumper off would just mean the card boots with stock 3d vgpu.Without the jumper,it would not oc higer then a voltage stock card.The core will only run the higher speeds because it is been fed 1.36v and not the stock 1.24v.

And yes,oc'ing with riva(ccc wont go over 770 and i dont trust atitool on the 38xx yet)

Cold Storm · Jan 15, 2008

thanks Tigger, thats all I wanted to know. And I'm with you on not trusting ati tool.

Deleted member 24505 · Jan 15, 2008

no problem

its best to know what your doing before you try this.

For anyone who wants to try it,make SURE the trimmer is set on FULL resistance,100kohms before you boot up.Check the vgpu as it posts,it will be at full 3d voltage when it posts,if its too high,turn off.Make sure you know the correct position for the wire on the board,also you can use a ground connection from the black pci-e power connections.

Cold Storm · Jan 15, 2008

Yeah, thats why I had rm do it.. but we didn't have the bios at stock, so it didn't work...

Random Murderer · Jan 15, 2008

Cold Storm said:
Yeah, thats why I had rm do it.. but we didn't have the bios at stock, so it didn't work...

No, it didn't work because I broke a resistor, remember?

Cold Storm · Jan 15, 2008

Random Murderer said:
No, it didn't work because I broke a resistor, remember?

I thought we also needed to have the bios at stock???

Random Murderer · Jan 15, 2008

Cold Storm said:
I thought we also needed to have the bios at stock???

Nah, I thought that was what the problem was until I realized that a resistor broke...

Cold Storm · Jan 15, 2008

all right... then i'm wrong on that... so even with the modded bios, it will still work? I'm asking the questions that I hope noobs should ask...

Random Murderer · Jan 15, 2008

Cold Storm said:
all right... then i'm wrong on that... so even with the modded bios, it will still work? I'm asking the questions that I hope noobs should ask...

Yes, it will still work, but it would be best to perform the mod on a stock BIOS and then flash a modded BIOS after you're sure the mod works... :banghead:

Cold Storm · Jan 15, 2008

So, if you for instance, have a pencil mod on the card, and wanting to do this Vcore, GPU mod, you want to erase the pencil mod before doing this, and flashing the stock bios back?

Random Murderer · Jan 15, 2008

Cold Storm said:
So, if you for instance, have a pencil mod on the card, and wanting to do this Vcore, GPU mod, you want to erase the pencil mod before doing this, and flashing the stock bios back?

Close, you would need to reflash the stock BIOS before removing the pencil mod, then you could safely remove the pencil mod and perform the hard-mod.

Cold Storm · Jan 15, 2008

now, why doing that first??? because to flash it to stock, why would you have to do the bios before taking off the mod???

Random Murderer · Jan 15, 2008

Cold Storm said:
now, why doing that first??? because to flash it to stock, why would you have to do the bios before taking off the mod???

These are some good questions, the kind I was hoping for when the thread started!
OK, you need to make sure you flash back to stock while the pencil mod is still "active" because if you remove the mod before you flash to the stock BIOS, the core will not get enough voltage to boot at the clocks of the modded BIOS.

Cold Storm · Jan 15, 2008

all right... I get that... Now, this is one for both you and tigger... what types of wires do you use in the gpu and v core mod? Whats the wires that you aren't suppose to use?

Random Murderer · Jan 15, 2008

Cold Storm said:
all right... I get that... Now, this is one for both you and tigger... what types of wires do you use in the gpu and v core mod? Whats the wires that you aren't suppose to use?

I used 24AWG stranded...

Cold Storm · Jan 15, 2008

but, is there anything that you should not use??? and why did you use 24? not besides the fact that its what you had... can you use smaller gage wire or what?

Cold Storm · Jan 15, 2008

You can test the resisters by putting the pos. lead on one side of the resister, and the neg. on the other side.. or thats how we did it for the pencil mod..

Random Murderer · Jan 15, 2008

ghost101 said:
What about voltage?

Also, is measuring resistance potentially dangerous with the wrong components since it sends a tiny current across the leads.

For measuring the voltage, ground the negative lead to your computer's chassis and touch the positive lead to the measure point.
This will not damage anything, since it is only measuring the difference in electrical potential.

Random Murderer · Jan 15, 2008

Cold Storm said:
but, is there anything that you should not use??? and why did you use 24? not besides the fact that its what you had... can you use smaller gage wire or what?

I used 24AWG stranded because it's all I have.
I would have preferred to use 28AWG Kynar or even wire-wrap(really freakin' small wire), but I'm broke and can't afford it... :ohwell:

Cold Storm · Jan 15, 2008

Random Murderer said:
I used 24AWG stranded because it's all I have.
I would have preferred to use 28AWG Kynar or even wire-wrap(really freakin' small wire), but I'm broke and can't afford it...

all right, well where can you go to buy those?? at radio shack or home depot??? Got to tell us where to get the tools we need!

thoughtdisorder · Jan 15, 2008

Cold Storm said:
all right, well where can you go to buy those?? at radio shack or home depot??? Got to tell us where to get the tools we need!

Chesters Electronics (on Missouri) - confirm with RM

Cold Storm · Jan 15, 2008

thoughtdisorder said:
Chesters Electronics (on Missouri) - confirm with RM

I know where to go here.. I'm asking as if a noob needs the advice... Giving out questions that a noob would ask.. But thanks anyway man!

thoughtdisorder · Jan 15, 2008

Cold Storm said:
I know where to go here.. I'm asking as if a noob needs the advice... Giving out questions that a noob would ask.. But thanks anyway man!

I knew that! :banghead:

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Processor	AMD 1700x
Motherboard	AsRork x370 Taichi
Cooling	EK Custom Loop - CPU only
Memory	32gb G-Skill Trident Z
Video Card(s)	EVGA 1080 Superclock 2
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Case	Cooler Master Cosmos II
Power Supply	Cooler Master V1000
Mouse	SteelSeries Rival 500
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Motherboard	AsRork x370 Taichi
Cooling	EK Custom Loop - CPU only
Memory	32gb G-Skill Trident Z
Video Card(s)	EVGA 1080 Superclock 2
Storage	Too Many
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How-to: Pencil mod your HD 3870!

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