An idle voltage for the 840M GPU of 0,943V is not correct for a mobile chip, see here for comparison with a desktop chip: http://www.anandtech.com/show/8526/nvidi...x-980-review/21. Please ckeck yourself. It seems to be that in the bioses you mention something is wrong. In the Maxwell II bios tweaker for your moded bios in the tab voltage table a voltage for CLK6 of 743,8mV to 831,3mV listed. It did not have success to mod your bios to take a idle voltage in the mentioned range or the idle voltage of 0,78V I had before with MSI standard bios so I switched back.
Thanks for the support.

@Maison1

Could you upload the VBIOS of your gpu for me so I can have a look at it?
I might be able to change the voltages of this VBIOS to match yours.
Having lower idle voltages would be interesting for me as well.
Thanks!

Here are the original VBIOSes for reference: 840M + 940M from Acer Aspire E5-572G and 940MX from Lenovo T560 (base for the ModBIOS, unlike most 940MX VBIOSes this one doesn't have a hardcoded memory frequency that can't be changed with the Maxwell II Bios Tweaker).

The sub device id in the file can be changed from MSI to Acer with a hex editor and the CRC of the file in Maxwell II tweaker repaired. I named the file to .APK from .ROM due to only these format are allowed to be uploaded in this forum.

@Maison1

Here's a VBIOS with adjusted idle voltage and all the sliders in Maxwell BIOS Tweaker unlocked (device and sub device ID are adapted to your card): https://drive.google.com/file/d/0B4NHIBM...EZTX21SWms/view
I adjusted the voltages to match those of your original VBIOS, you can further adjust the idle voltage with the slider that currently shows 775mV.
As for your throttling problem under load, you will have to reduce the core frequency till the card doesn't throttle anymore (the voltage of the according boost step will be used).
Then based on that voltage you can see how far you can overclock so that it still works properly.
After that is done (and you tested your overclock for stability), you can create a new VBIOS based on that (or tell me the values and I'll do it).

Also, according to my tests, overclocking the memory frequency is very beneficial for this card and can give a pretty nice performance boost without the card getting noticeably hotter/drawing more power.

Thank you very much. I tested your modified bios. The idle voltage is now pretty close to the origin idle voltage of 0,78V. In GPU-Z it is between 0,8410V and 0,8370V. I will mod and test futher.

The slider for the idle voltage in the voltage table tab is P08 due to in the common tab under basic clock settings for the three entries Entry#0 was selected. I have set for P08 731,3mv to 775,0mV which is displayed in GPU-Z as 0,7870V to 0,7930V. It looks like between set bios voltage and card output a tolerance exists. You can try it yourself on your card. I did not go to lower voltages yet.

Update: BIOS 1.09c is now available!

Changes:
Changed Nvidia GPU idle voltage from 0,94V to a more correct value of 0,76V - thanks to Maison1 for bringing this matter to my attention
Unlocked all sliders in the Nvidia VBIOSes for editing with Maxwell II BIOS Tweaker - thanks to WerePug from overclock.net for posting the way to do this

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@Maison1
Had some time today to test out lower idle voltages and ended up on 700mV idle voltage (which is 0,718V in GPU-Z).
Also tried 600mV (the minimum, didn't boot into the desktop with that one) and 650mV (caused sporadic problems when displaying things) before.
Actually, to go below 0,793V you also need to edit the CLK00-05 voltage slider as the GPU seems to take the higher voltage between this one and the P08 voltage slider.
Additionally, I've decided to release a new ModBIOS with a lower idle voltage of 750mV (should be around 0,768V).

Hello for Everyone.I have an old Gericom laptop with N251S6 bios .I attached the bios files, but it doesn't contains rom file to modify it, because i want to reach the fsb and other overclock menus.I didn't found any other bios file for this laptop.If anyone can help me I really apreciatate it.

Hello! I flashed the "21 cpu microcode" modded bios to my e5-572g. I set all of your recommended Bios settings. Now if I start a gpu stress test, my notebook get really warm and suddenly shutdowns. The fan is working 100%. I checked my GPU temp with AIDA64 when I ran the GPU tests, It raises 90-92 celsius before shutdown.. Sad

What should I do? What should I change from the Preferences? Can I underclock the GPU? I very like this modded BIOS, and I dont want to flash the stock one.
Here is a screenshot from GPU-Z.



Thanks your answer!
Sorry for my english.. I'm hungarian. Blush
Best regards!

@endruw00
Sorry, I can't help you with that either. Modding a normal BIOS is very different from modding an UEFI BIOS. Your best bet might be to ask there for help: https://www.bios-mods.com/forum/Forum-Bios-Mods-Forum

@sh4rky89
Looks like the GPU overclock's a bit too much for your notebook... I've uploaded a BIOS with a more stock-like 940MX VBIOS here: https://drive.google.com/file/d/0B4NHIBM...FlFbklPT1k/view
Hope that one works better for you.

@mclarke2355
Thanks for your fast reply! :) I'll flash it tomorrow and write down the result after some stress tests.

@mclarke2355

I flashed it yesterday and reinstalled my notebook operating system.
I did some stress tests with AIDA64 and IETU.
When I started a GPU stress test my CPU package temp reached 100 celsius sometimes and my notebook shutdowned immediately.
My GPU temp was a bit better than the previous, non test version bios.

I've attached a picture about the test, before the notebook shutdowned.

@sh4rky89
Sorry, the changes I did in the Test-BIOS might not have been very effective.
So, here's a new BIOS: https://drive.google.com/file/d/0B4NHIBM...jZVSG5nQ1U/view
The GPU BIOS is now mostly the stock 940MX one (aside from 1070MHz memory instead of default 1001MHz and lower idle voltage).
Also you should leave the following BIOS settings at their default values for now:

Bi-Directional PROCHOT#
Long Term Power Limit Override
Long Term Time Window

Hope it works better with this one.

If even this one isn't enough, here's one with completely stock Acer GPU VBIOS: https://drive.google.com/file/d/0B4NHIBM...VI1Zk1odWM/view
The BIOS settings above are the only ones that are relevant for temperature.

On a slightly different note, a good amount of the very high CPU temperature comes from Aida also stress testing the Intel GPU in addition to Intel CPU and Nvidia GPU. Using a test that only stress tests Intel CPU and Nvidia GPU at the same time might be more realistic.

Hello,

I've tested the modded bios you posted on my work laptop, an e5-572g, i3-4000m, 940m,8gb ram, and what i noticed is that there are some settings in there that don't seem to work, like NUM LOCK on when I boot, modifying the values for the system cooler (speeds, and temperature when to switch to high rpm), and disable the post screen. I would like to make some adjustments to the system cooler because how it is in factory mode is not ok at all, and a little bit of extra noise is not an issue.

Thanks in advance.

@faith1105
Hi,

sadly Acer didn't implement every setting properly. Aside from making the settings visible there's nothing I can do, unfortunately.
On this notebook the fan is controlled by an EC-Controller, so changing settings in the BIOS won't affect it.
I don't know how to edit the EC-Firmware to change the fan behaviour as there's no documentation about this at all.
The best I can offer you are some BIOSes where I replaced the EC-firmware with a version that was used in a previous BIOS-version (base of the mods is the Microcode 21 BIOS).
These may have different fan settings, so testing might yield a better result than you have now.

Test_EC1.04-1.06
Test_EC1.03
Test_EC1.02

As for disabling the boot logo, I actually had that one working at one point (there were more settings that needed to be changed, I believe), but I don't know what exactly it was that made it work.

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In case anyone is interested in changing the fan behaviour, feel free to try out the test BIOSes I posted above.
I'm interested in whether they make a noticeable difference or not.

Also, I will probably turn down the overclock of the GPU VBIOSes for the ModBIOSes soon (as it was too much to handle for some notebooks) and offer a special version with the currently used overclock.
That way everyone should have a suitable BIOS for daily-use.