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Gonna Pencil Mod my 3870s

post #1 of 13
Thread Starter 
Ok, I have decided to go ahead and do a Pencil Mod on my 3870s and I need to ask a couple questions.

After looking at the board, it seems that the place to do the mod (choosing the newest and supposedly best location according to this thread) is the same as the reference board, so that part is easy. My question is that area is so tiny do you just put the pencil there and move it ever so slightly back and forth between the points, rotate it around, basically what is the application method used?

Second I am trying to find a decent cheap DMM, so suggestions?

Third, do you just turn the pc on to get the VCore measurement or do you have to run ATITool or something to pull the card out of 2D mode to get the correct measurement?

Finally, do you check the Resistance and the VCore or just the VCore?

HERE'S TO THE 18K+ PURSUIT!!
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post #2 of 13
i don't know much about pencil modding beyond the theory but have you tried any 3870 bios editors, they'll let you set specific numerical values for voltages and frequencies with none of the guesswork.
    
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post #3 of 13
Yes but you also run the risk of a bad flash bricking your card. Pencil mods are very easy, I've done tons of em
post #4 of 13
Thread Starter 
Quote:
Originally Posted by SyncMaster753 View Post
i don't know much about pencil modding beyond the theory but have you tried any 3870 bios editors, they'll let you set specific numerical values for voltages and frequencies with none of the guesswork.
BIOS modding for voltage does not work. I think the max is still 1.33 (I think) no matter what you set. It has been verified by someone in some post, i just don't know where as I have been through alot.
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post #5 of 13
Thread Starter 
Quote:
Originally Posted by TnB= Gir View Post
Yes but you also run the risk of a bad flash bricking your card. Pencil mods are very easy, I've done tons of em
Details, man Details!
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post #6 of 13
just move the pencil back and fourth you should turn the rig on and see what the voltage is, quickly and then turn it back off. radio shack, habor height/ B&M have cheap digital multi meters
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post #7 of 13
Yes it's very important to have NO power going to the pc while you do it. Simply go back and forth with the pencil across the resister that is highlighted and it should work. Just be careful not to apply too much pressure or you could crush the resistor. Also make sure you don't accidentally mark on any other parts. A steady hand is all you need
post #8 of 13
I think the max voltage allowed in BIOS is 1.35V, so even if you modify a BIOS for 1.5V, it reverts to 1.35V. I think it's a security lock of some kind on the BIOS itself. If you want any higher than 1.35V a pencil mod is the only way to go. Keep in mind that this amount of voltage requires a good cooling system, and I wouldn't expect a long life from a card that runs with more than 1.4V 24/7.
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post #9 of 13
Thread Starter 
Quote:
Originally Posted by Melcar View Post
I think the max voltage allowed in BIOS is 1.35V, so even if you modify a BIOS for 1.5V, it reverts to 1.35V. I think it's a security lock of some kind on the BIOS itself. If you want any higher than 1.35V a pencil mod is the only way to go. Keep in mind that this amount of voltage requires a good cooling system, and I wouldn't expect a long life from a card that runs with more than 1.4V 24/7.
My only intention is to try my hardest to get 18000+ in 3DMark06 with just my lowly Phenom and Tri-Fire. So it will be run hard for a few hours and then erased.

BTW what is max voltage that I should avoid and what is the typical voltage everyone attempts to hit.
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post #10 of 13
1.4-1.5 just stay under 1.55-1.6 unless you have the cooling
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