How-to: Pencil mod your HD 3870!

toptap · Mar 25, 2008

palit hd 3850 it not mod pencil

SpookyWillow · Mar 25, 2008

do you have a good close up pic of the card?

Random Murderer · Mar 25, 2008

SpookyWillow said:
random can you give us a bit of help m8?

i need to hard mod my card as it wont run on stock voltage (1.29v) where do i need to put the pot? do i just solder it on to the resistor i shade?

that's something i can't say without having the card on hand.
if you want, pm me and i can walk you through how you would find the point.

freaksavior · Mar 25, 2008

i got some rubbing alcohol but its 50% isopropyl....is that good enough or should i get it with 70%

DanishDevil · Mar 25, 2008

I used 70. I think 50's probably fine, but I would use an air compressor on like 10PSI to blow it dry. The more alcohol the quicker it evaporates into the air, so I would just be sure it was dry before I stuck it back in.

You hear bout your Diamond RMA yet?

Random Murderer · Mar 25, 2008

freaksavior said:
i got some rubbing alcohol but its 50% isopropyl....is that good enough or should i get it with 70%

don't use anything less than 70%. 50% has too high of a water content; when the alcohol evaporates, you'll be left with little water droplets on whatever surface you were cleaning.

freaksavior · Mar 25, 2008

i used 91% and it works now.

DanishDevil · Mar 25, 2008

Woohoo! Rubbing alcohol saves all!

freaksavior · Mar 25, 2008

i wish i had my diamond to try it on.

DanishDevil · Mar 25, 2008

Well you know for next time at least

Dr. Spankenstein · Mar 25, 2008

It makes me think of the classic arcade game, Altered Beast: *nearly unintelligible* "Rise-from your grave..."

toptap · Mar 26, 2008

sorry my pic i it ....bad

SpookyWillow · Mar 26, 2008

that pic is no good, you need to be able to make out resistor numbers,

DanishDevil · Mar 26, 2008

I don't even see any resistor numbers...

Try snapping another. I think you've got the right area, though. Keep in mind, some cameras don't like close-up pictures.

Bakerman · Mar 27, 2008

Hi,

Can you guys please help me??

I want to pencil mod my Sapphire 3850 256MB.
I can get 810/1100 with bios mods but I need more voltage.

What resistor should I shade?
Is it he R1222?

SpookyWillow · Mar 27, 2008

does the board look the same as the ones at the start of this thread? or any of the other cards posted in this thread?

DanishDevil · Mar 27, 2008

If you take a high resolution picture of the back of the card (be sure to get the area to the left of the metal GPU retention clips all the way to the back of the card, then we can either confirm which resistor to shade, or have RM see if he can figure it out.

DaPhreak · Mar 29, 2008

Asus Hd3870

Hi Guys,

Maybe someone of you could help me vmod this Card, it looks different to the other pics posted here.

This are the pics

SpookyWillow · Mar 29, 2008

can you get a pic of the other end of the card, just take pics around the areas where the capacitors are and then we can see what we need.

DaPhreak · Mar 29, 2008

OK sry,

Better?

Bakerman · Mar 29, 2008

I just did a pencil mod on my Sapphire 3850 256MB with a HB pencil. I cut the end of the pencil so that it was flat and used the figure 8 method to finaly get a result.
I don't have a multi meter, but judging from experience I'm at +-1.4V. I'm running 100% stable at 840/1080, temps are 65 with stock cooler at 80%.

sneekypeet · Mar 29, 2008

so how do you test voltage by experience?

Seems slightly suicidal to me....that card could go by by with one little slip of your experience.

SpookyWillow · Mar 29, 2008

sneekypeet said:
so how do you test voltage by experience?

Seems slightly suicidal to me....that card could go by by with one little slip of your experience.

exactly what i thought, pencil modding is so risky as it , the results are just too random.

Bakerman · Mar 29, 2008

I can safely judge it by looking at my temps and what other people got with the same card at 1.4 volts, at 1.5 volts the temps go way up and I should get 860 on the core.
I didn't just do it all at once.
I would add a little more clock and pencil more and then benchmark, add a little more clock and pencil more and benchmark etc.
Yes it is a bit risky! But it works fine! hehe

sneekypeet · Mar 29, 2008

must be the coolers, because im runnin 1.5V and 70% fans and at 900/1350, Crysis or any test wont put my card above 60*C

See why I say its more of a lucky guess,than experience. Every card reacts differently.

Be very very careful with your way of measuring voltage.

Oh and BTW one swipe with my HB pencil took my resistance to 0.862, if I had booted without checking resistance first , I may have booted at 1.6V on stock cooling!

Not trying to single ya out baker, just trying to keep ya in the game with less kills is all!

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Memory	4x 8GB G.Skill TridentX DDR3-1600 \| 2x 4GB G.Skill RipJaws 4 DDR4-3000
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System Name	TOO MUCH RADIATOR! \| The TV Box a.k.a. The Shoebox
Processor	Core i7 4930K @ 4.5GHz \| Core i5 6600K @ 4.5GHz
Motherboard	Asus X79 Rampage IV Extreme \| Asus Z170i Pro Gaming
Cooling	Custom water on CPU and GPU, dual 360mm radiators \| Corsair H80i
Memory	4x 8GB G.Skill TridentX DDR3-1600 \| 2x 4GB G.Skill RipJaws 4 DDR4-3000
Video Card(s)	Sapphire AMD R9 295x2 \| PowerColor AMD HD7970
Storage	Samsung SSD 830 256GB, various others \| 2x 1TB Seagate Barracudas in RAID1
Display(s)	Dell U2713HM 2560x1440 IPS \| Panasonic TC-L32E5 1080p IPS TV
Case	Thermaltake Suppressor F51 (stripped down to hold two radiators) \| Cooler Master Elite 130
Audio Device(s)	RM-DAC -> Xiang Sheng 708b -> Sennheiser HD650 \| HDMI sound device on 7970
Power Supply	LEPA G1600-MA 1600W \| Corsair CX750M 750W
Software	Win 10 64
Benchmark Scores	over 9000 BungholioMarks, "Bitchin' Fast"

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How-to: Pencil mod your HD 3870!

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