Actually it's not a missing step. There are two ways to undervolt/overvolt; software & VBIOS mod. For software, you can try Sapphire TRIXX.

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Added on May 6, 2011, 10:00 pmTo mod VBIOS, you can use RBE (Radeon BIOS editor).

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Added on May 6, 2011, 10:06 pmYou can skip it. It just set sub-vendor id (usually card/notebook manufacturer; Dell, Acer, etc).

EDIT: I know why he/she set the sub-vendor ID. He/she need to set it to 0x1025 (Acer) because by default it set to 0x0000. If didn't change it, RBE will refused to save the ROM file. Can skipped this step if sub-vendor ID not 0x0000.

EDIT 2: I don't understand why he/she HEX edit the VBIOS & increased the overdrive limit.

This post has been edited by kizwan: May 6 2011, 10:21 PM

WOW! kizwan! nice for you to drop by. really grateful for what u did in helping to mod bios all of us.



Unfortunately, I tried the Sapphire Trixx 4.0, didnt work for 3820tg... a few other 3820tg users also reported that it's not working.



Apparently Lennong couldnt adjust the voltage using RBE: http://forum.notebookreview.com/acer/56257...tml#post7293846

This post has been edited by cowithgun: May 7 2011, 01:52 AM

Somehow cannot complete the creating new BIOS, keep saying new BIOSCOD04.ROM is 4 bytes too big and so couldn't integrate the new BIOSCOD04.ROM.

It's confusing for me as well, first he set it using RBE to 0x1025. Then using Winhex, he looks for 0x1025 and change that to 0x0000... according to the author, somehow, this steps is irrelevant for voltage and frequency ...

so, using RBE alone should have work?!

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Added on May 7, 2011, 2:06 ami remember kizwan told me before that 3820tg BIOS is a bit problematic..., but this guy seem to have been able to unpack, modify and repack it back:

http://acer.it168.com/thread-1271947-1-1.html

ohh... since u are on it, i should try also! let me know what u get...

This post has been edited by cowithgun: May 7 2011, 02:06 AM

The one I'm trying is for SXPS 16

As for that guide, the problem I'm having is can't find the SLIC file, I tried ACPI03.ROM, ACPI04.ROM but it says SLIC wrong size file...

anyway, i m trying to pack the bios now...

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Added on May 7, 2011, 2:30 amwell, i created JM31119_SLIC.exe successfully... modified the voltage as well... just... duno.. if... i should flash it...

This post has been edited by cowithgun: May 7 2011, 02:30 AM

Create Crisis Disk first ?
http://forum.notebookreview.com/7016499-post8674.html

yes, looking at kizwan post on that... best create it first... come to think of it, i didnt even create Crisis when i unlock the intel menu...

If like that, your Intel menu should gone if flash this one ?

that is very easy to unlock, just use SYMCMOS to change 1 byte... can do it anytime

i was telling myself not to flash bios because i need this laptop for an oversea trip next week...

okay, hold your horses

i said, i was...

Crisis USB created... here goes nothing! see ya tomorrow if I cant boot up my notebook, ^o^

Good luck!

there is good news, there is bad news...

good news, yay, can boot, but only with Discrete mode... and frequency changed to whatever i set...

bad news, voltage remain at 1v...

i still wanna try something out...

i was following exactly steps from this tutorial (only that, i increase the voltage even though when he advised not to):

http://acer.it168.com/thread-1271947-1-1.html

the steps including editing the Additional Feature using old RBE 1.23.. i wanna skip that part since the new tutorial advise just leave that be...

time to mod again...

^PowerPlay still works ?

Yeah, it's not related to voltage & clocks mod. RBE v1.27 & lower produced error when trying to save the ROM file if the sub-vendor ID is 0x0000.

RBE v1.28 don't have this bug, so don't need to change the sub-vendor ID.

RBE alone should work but hasn't tested it myself (undervolt/overvolt). I only change the core & memory clocks.

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Added on May 7, 2011, 3:17 amNo need to select SLIC file. Just make sure select "No SLIC" in the Advanced options window.

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Added on May 7, 2011, 3:21 amMaybe you increased the voltage too much. Try increment by 0.1.

I think just skipped the Additional Feature part.

This post has been edited by kizwan: May 7 2011, 03:21 AM

if i use RBE 1.23 to edit the "Additional Feature" the PowerPlay is gone.

My second mod attempts, I leave that part untouched.. PowerPlay is back...

However, still no changes at voltage... i was trying 1.05... let me try 1.01

flashing bios can be addictive...

Maybe too small. Try 1.1.

Try tested it with AMD GPU Clock Tool.


I think Acer put cheap voltage regulator that don't allow undervolt or overvolt.

tried 1.01 and even lower the voltage of clock01 and clock02, but apparently, only the frequency is working...

i even tried this:

1. in RBE, set vendor to acer
2. find and change 0x1025 back to 0x0000

guess, there is no way to change the voltage, as of now...

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Added on May 7, 2011, 3:57 amAMD GPU Clock Tool cant start... "No valid devices found"

There are only 2 voltages I have seen with 3820tg, 0.9v and 1.0v .... meaning it is changeable?

This post has been edited by cowithgun: May 7 2011, 03:57 AM

Probably locked to only 0.9 & 1.0. Sometime manufacturer put cheap voltage regulator which won't allow you to increased or decreased the voltage manually.