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How-to: Pencil mod your HD 3870!

Random Murderer

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for vmem i got 2.31 is that safe for gddr3 still have 1.32 for vgpu. Have mem at 1125Mhz stable in furmark haven't gone farther trying to get core higher
if you have adequate cooling on the mem, i would say 2.35 is safe, but no higher.
the fact that you still have 1.32 vddc tells me that your card's voltage cannot be controlled by software/bios. the later cards that were still on ref. pcb's had this option removed. have you tried pencil modding it?
 
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Yeah tried pencil modding it and the voltage doesn't go up. Im suppose to shade the resister 1222
 
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I drooped the vmem voltage to 2.17 because games started crashing with 1ghz memory
 
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Like... duh!

Seems my card isn't such a bad overclocker after all! I got a new case, so better cooling obviously, and decided I'd try to take things up a notch. And I was right!

Previously I got 891/1170 before artifacts spoiled the fun.

Yesterday I started roughly cranking it up, still without pencil mod obviously.

First off, core @ 910, mem @ 1200ish, no problems....:twitch: I figured it could be done then.
I went tweaking with big steps mind you. Next step:
Core 930, mem 1300 - vid freezes. afaik that happens when the core is over its top.
Core 920, mem 1300 - 3DMark06 runs fine until Deep Freeze, where the image is split in half and copied twice onto the screen somehow. Not sure whether that's the core or the mem, but I suspect the mem.
Core 920, mem 1250 - 3DMark06 success! FurMark + Orthos gets me GPU temps under 60:cool:

...that's when I realised it was way past midnight and I had to work today. More to come and obviously proof when I'm satisfied.
 

Random Murderer

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Random Murderer

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nope, it's not that chip.

gimme the numbers off of this one:

 
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Seems my card isn't such a bad overclocker after all! I got a new case, so better cooling obviously, and decided I'd try to take things up a notch. And I was right!

Previously I got 891/1170 before artifacts spoiled the fun.

Yesterday I started roughly cranking it up, still without pencil mod obviously.

First off, core @ 910, mem @ 1200ish, no problems....:twitch: I figured it could be done then.
I went tweaking with big steps mind you. Next step:
Core 930, mem 1300 - vid freezes. afaik that happens when the core is over its top.
Core 920, mem 1300 - 3DMark06 runs fine until Deep Freeze, where the image is split in half and copied twice onto the screen somehow. Not sure whether that's the core or the mem, but I suspect the mem.
Core 920, mem 1250 - 3DMark06 success! FurMark + Orthos gets me GPU temps under 60:cool:

...that's when I realised it was way past midnight and I had to work today. More to come and obviously proof when I'm satisfied.
Nicely done! :toast:
 

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hi guys , i've read all the thread and i can't seem to find a pcb that looks like my Powercolor 3850 pcs 512mb card
here's the picture .. i found the r1222 but it isn't on the card , it is just written there in the marked space but theres nothing there ?? someone could give me an ideea what should i look for to pencil mod my core voltage (and also where to measure my core voltage )

Thanx !! and keep up the good work ,techpowerup rulz :rockout:
 

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theorw

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Seems my card isn't such a bad overclocker after all! I got a new case, so better cooling obviously, and decided I'd try to take things up a notch. And I was right!

Previously I got 891/1170 before artifacts spoiled the fun.

Yesterday I started roughly cranking it up, still without pencil mod obviously.

First off, core @ 910, mem @ 1200ish, no problems....:twitch: I figured it could be done then.
I went tweaking with big steps mind you. Next step:
Core 930, mem 1300 - vid freezes. afaik that happens when the core is over its top.
Core 920, mem 1300 - 3DMark06 runs fine until Deep Freeze, where the image is split in half and copied twice onto the screen somehow. Not sure whether that's the core or the mem, but I suspect the mem.
Core 920, mem 1250 - 3DMark06 success! FurMark + Orthos gets me GPU temps under 60:cool:

...that's when I realised it was way past midnight and I had to work today. More to come and obviously proof when I'm satisfied.


I thought i should mention the clcks i could achieve before killing(accidental short circuit) my 3870...
932core@1,44volts/~1250 mem @2,33
Stable like ROCK...On stock cooler!!!but blowing like jet...!
Great card,i miss her...:ohwell:
 

Random Murderer

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hi guys , i've read all the thread and i can't seem to find a pcb that looks like my Powercolor 3850 pcs 512mb card
here's the picture .. i found the r1222 but it isn't on the card , it is just written there in the marked space but theres nothing there ?? someone could give me an ideea what should i look for to pencil mod my core voltage (and also where to measure my core voltage )

Thanx !! and keep up the good work ,techpowerup rulz :rockout:
it looks to be very similar to the reference board. maybe it is, i haven't seen a 3850 in ages, lol.
there was an alternate pencil mod for those of you who ddon't have r1222, lemme see if i can dig it up.:toast:


I thought i should mention the clcks i could achieve before killing(accidental short circuit) my 3870...
932core@1,44volts/~1250 mem @2,33
Stable like ROCK...On stock cooler!!!but blowing like jet...!
Great card,i miss her...:ohwell:
i got the same core clock on my card on the same voltage. never bothered with the mem voltage because mine did 1350 on stock voltage.
 

Buster

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i've found the pencil mod finally in this thread , but i'd like to measure the vcore to know how high i've gone
I don't know right now what to connect to the ground to measure it . if you can point out where from the image i've posted earlier . or any other if you have one !!
Thanx :rockout:
 

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i've found the pencil mod finally in this thread , but i'd like to measure the vcore to know how high i've gone
I don't know right now what to connect to the ground to measure it . if you can point out where from the image i've posted earlier . or any other if you have one !!
Thanx :rockout:
ha. ground point is easy.
just put the ground lead in one of the ground pins of a molex connector, ground it to the case, or one of the screws on the card.
 

theorw

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Ground use a screw on the card as RANDOM mentioned mor the case.
For measuring the core volts i point u 2 places.The 1st is the most likely to give u the voltage.If it doesnt try the other spot.But i am preety sure it will be the right.
 

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I thought i should mention the clcks i could achieve before killing(accidental short circuit) my 3870...
932core@1,44volts/~1250 mem @2,33
Stable like ROCK...On stock cooler!!!but blowing like jet...!
Great card,i miss her...:ohwell:
I just clocked her back to bios defaults, got me a 4850 yesterday...
 

theorw

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I just clocked her back to bios defaults, got me a 4850 yesterday...
Any ocing yet on your 4850...???
And why clocking back to stocks on your 3870 anyway???
 
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Any ocing yet on your 4850...???
And why clocking back to stocks on your 3870 anyway???
Cause I'm gonna sell it, unfortunately no CF between 38xx and 48xx.

Haven't put the 4850 in yet :p
 

theorw

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What model,brand is your 4850?Reference PCB??Stocl cooler?I say u put her in,measure stock volts and then shut down,pencil mod and put her back in!!!Then oc her straight to 750!!!!!:laugh::laugh::laugh:
 
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What model,brand is your 4850?Reference PCB??Stocl cooler?I say u put her in,measure stock volts and then shut down,pencil mod and put her back in!!!Then oc her straight to 750!!!!!:laugh::laugh::laugh:
Oh, it's already on 750... Done by the previous owner :D
 

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Lucky u!Well tell us on what volts the 750 is...Mine goes to 781-1150 easy.See my specs for volts...
What about your cooler?Stock one?
 
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Switched my VF1000 from the 3870 to the 4850 (Asus, single slot, nasty jet sounds)
But I can't get you specs now as I'm at work and stuff :p
 

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With this cooler and the proper pencil mod u ll hit 800 core easy!!!!!!
 

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i've got it in the sweet spot 1.37 vcore and stable at 850 Mhz on the rv670 , i won't go higher , even though i have the Zerotherm cooler on it with an additional antec tricool 92mm , 850 mhz is enough 11270 point in 3dmark 2006 with memory at 2150mhz and the brisby at 3.27ghz :p
thanx for help all of you !!
 

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aha!
i believe that is the chip we're looking for!
lemme dig through my data sheets and i'll get back to you.

EDIT:
It is indeed the sacred chip we have been questing for.
pin 13 is your feedback pin. we need to follow the traces this pin follows to ground. think you can handle that?
btw, in case you didn't know, the pins are numbered counter-clockwise from the dot on the corner. think of the dot as 0 and the pin immediately counter-clockwise is pin 1.
 
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