3940XM overclocking - parameters to change.

[Siplast]

On 8/20/2026 at 9:31 PM, Busta Bloodnut said:

I know this thread is sort of old, but I will show you my specs and for future inquiring folk who want to overclock a 3940xm:

Just read your post and was hoping you might inform me as to which unlocked bios you are using on the M18xr2 ?

I have the same mods as you using 3080. On overclocking I can only set the flex ratio override to a max of 25 and yours is set to 32 ?

I know that the 3940xm and 3920xm have differing available settings are you using 3920 on the m18xr2 in the pics ? I am using Swick unlocked A11

Thanks

[Busta Bloodnut]

 

19 hours ago, Siplast said:

I am using Swick unlocked A11

I have A11 Unlocked also but the mod is sv17. Not sure if thats the same guy or two different modders as im not informed too much on that sorta stuff. I just downloaded that one since it was the first one I seen.

 

19 hours ago, Siplast said:

On overclocking I can only set the flex ratio override to a max of 25 and yours is set to 32 ?

 

When I have it enabled it just defaults as 32. Last time i changed it (I forget if I was setting it higher or lower than 32) it blue screened before windows even started and wouldn't turn on so i had to reset CMOS and im not going through that again lol.

 

19 hours ago, Siplast said:

I have the same mods as you using 3080.

What mods do you have? All same as me? Even the optional ones? Also which CPU do you have?

[Siplast]

M18xr2 with unlocked a11 by swick/ Svl7 with 3940xm 32gb of 1866(needs to be 2133mhz but impossible to find anymore) Using and xvision rtx3080mxm that the vbios is locked to 115w. Trying to get a great firestrike score with oc from the bios. Seems I will have to use Intel XTU for tuning my oc. Did you download the a11 from ssj92 on this site or another?

Thanks

[Siplast]

I have 2133 in my other m18xr2 but I don't really want to break down that set up right now

[Siplast]

Looking for custom heatsink for M17x r4 for the 3080 with backlight mod as a next project.

[Busta Bloodnut]

17 hours ago, Siplast said:

Did you download the a11 from ssj92 on this site or another?

 

I THINK it was from here. Its been a minute since Ive gotten it. I could send you the one I have if you want and you can reflash. Maybe that Swick one is outdated? Its either that or your mobo is having issues.

 

17 hours ago, Siplast said:

(needs to be 2133mhz but impossible to find anymore)

 

Lol good luck with that. I mean, i see them every now and again on Ebay but always one or two of them but i would rather just get them all at once.

 

17 hours ago, Siplast said:

Looking for custom heatsink for M17x r4 for the 3080 with backlight mod as a next project.

 

The Ebay user you probably bought your 3080 heatsink from (cicichen) MIGHT have one for that 17x r4. I say might because last time i asked him to make me a custom heatsink for the 3940xm i have in there and they said they couldn't because they didnt have the materials for it. I should message them again to see if they do have them now lol. Tired of it hitting 90c everytime it updates.

[SuperMG]

26 minutes ago, Busta Bloodnut said:

 

I THINK it was from here. Its been a minute since Ive gotten it. I could send you the one I have if you want and you can reflash. Maybe that Swick one is outdated? Its either that or your mobo is having issues.

 

 

Lol good luck with that. I mean, i see them every now and again on Ebay but always one or two of them but i would rather just get them all at once.

 

 

The Ebay user you probably bought your 3080 heatsink from (cicichen) MIGHT have one for that 17x r4. I say might because last time i asked him to make me a custom heatsink for the 3940xm i have in there and they said they couldn't because they didnt have the materials for it. I should message them again to see if they do have them now lol. Tired of it hitting 90c everytime it updates.

They are busy with my custom P775 watercooling 2 in 1 heatsink for RTX 40XX. Been 2 weeks, spent 400USD...

[Siplast]

I would like to see pictures of that when you get it !

1 hour ago, SuperMG said:

hey are busy with my custom P775 watercooling 2 in 1 heatsink for RTX 40XX. Been 2 weeks, spent 400USD...

I would like to see pictures of that when you get it !

[Siplast]

They did a great job on 3080 heatsink for M18XR2, said it was version 2. Bulged up the keyboard a bit bit trimmed small piece from the cover and it fit pretty nice.

[Siplast]

1 hour ago, SuperMG said:

The Ebay user you probably bought your 3080 heatsink from (cicichen) MIGHT have one for that 17x r4. I say might because last time i asked him to make me a custom heatsink for the 3940xm i have in there and they said they couldn't because they didnt have the materials for it. I should message them again to see if they do have them now lol. Tired of it hitting 90c everytime it updates.

They messaged me back and has a few left on Amazon. What OC have you been able to get with that 3940 ?

[Siplast]

Got the backlight mod in today from you and thanks ! Now to get the heatsink so I can try it out

[SuperMG]

51 minutes ago, Siplast said:

They messaged me back and has a few left on Amazon. What OC have you been able to get with that 3940 ?

The custom CPU heatsink isn't worth it. No improvements nothing. Only the M14X R2 fan mod is worth it

[Siplast]

1 hour ago, SuperMG said:

The custom CPU heatsink isn't worth it. No improvements nothing. Only the M14X R2 fan mod is worth it

So the stock one will work with xvision 3080 ?

[SuperMG]

36 minutes ago, Siplast said:

So the stock one will work with xvision 3080 ?

 

M17X R4:

The custom GPU heatsink is good (4 heatpipes), you also need the better fan. (+10CFM)

[Siplast]

my mistake, long day at work. Just saw that you said the cpu heatsink was not good, but that the gpu heatsink is good !

Thanks for that

[Busta Bloodnut]

On 9/8/2026 at 5:28 PM, SuperMG said:

The custom CPU heatsink isn't worth it. No improvements nothing. Only the M14X R2 fan mod is worth it

 

The custom cpu heatsink has a copper radiator/fins while the OG one only has an aluminum one. One of the m18x r2's that i have (my secondary unit) has the same model 3940xm, same model cooling pad and same thermal conductors. Only difference is that it has a gtx 1080 and the CPU is not as OC'd as my main rig (all cores being 46) and OG 3pipe heatsink and it STILL gets much hotter than the one in my primary rig that has the copper radiator/fins. I mean, this is my experience with this custom heatsink anyway. Could be that some people got a fake copper radiator one? I have heard of that happening. But cicichens never done me wrong (My only gripe is he cant/wont make me a custom heatsink for my 17x r4's 3940xm  ...yet lol). Could also be that the CPU i got for my secondary was maybe used. I dont remember if it was or wasn't since it was a few years ago, but i just upgraded my primary rig to a newer/open box 3940xm. Could also be i dont use that other rig nearly as often as my primary as its my secondary and PTM 7950 gets better and better the more you use it.

 

On 9/8/2026 at 4:36 PM, Siplast said:

What OC have you been able to get with that 3940 ?

I got mine up to 4.79 GHz (see my Task Manager pic). All cores being set to 48 and the flex video being 48 (BIOS reference pic). I have the flex at 49 now but i dont see much a difference in performance, but im too lazy to change back to 48 lol. I will probably change it back to 48 the next time i have update my RTX 3080 since i have to lower my OC because having it so high blue screens my machine every time i update the GPU. I do recommend getting a stronger adapter for your rig though if you plan on going that high with the CPU seeing as that GPU is power hungry and idk if you can OC that high (while having that GPU) with the 330w adapter. Last time tried to do that it was all cores and flex at 47 and games/browsers/other apps would close randomly out of nowhere every time, so i just assumed it was a power issue (and i had the Quadro P5000 in my main rig at the time). If that 780w adapter is too expensive (I dont blame you) I have seen a 400w adapter in my Ebay feed. Maybe that would be good for it both those components?

 

 

On 9/8/2026 at 7:50 PM, SuperMG said:

you also need the better fan. (+10CFM)

 

Wait, theres also a fan mod for the RTX 3080? First time ive heard of it. Where do i get?

 

On 9/8/2026 at 2:50 PM, SuperMG said:

They are busy with my custom P775 watercooling 2 in 1 heatsink for RTX 40XX. Been 2 weeks, spent 400USD...

That water cooling for an m18x r2???

[Busta Bloodnut]

On 9/8/2026 at 4:17 PM, Siplast said:

Bulged up the keyboard a bit bit trimmed small piece from the cover and it fit pretty nice

 

Yeah, i had to modify my palmrest also since it looked aesthetically unappealing and i didn't want any pressure on my keyboard/GPU.

[Siplast]

1 hour ago, Busta Bloodnut said:

 

Yeah, i had to modify my palmrest also since it looked aesthetically unappealing and i didn't want any pressure on my keyboard/GPU.

Was able to get flex ratio to 32 after disable and boot back into bios but the 3940 i have would not go past 4.6. I guess ill borrow the 2133 from my other m18x r2 and just populate 2 sticks in the bottom instead of 2 up top and two on bottom. This should increase my oc and make it more stable if I tighten the timings. I also have two other 3940xm's stored away loose and one in my M17x r4. Looks like a project for the weekend. Thanks for the input !

[Siplast]

On 9/8/2026 at 2:50 PM, SuperMG said:

They are busy with my custom P775 watercooling 2 in 1 heatsink for RTX 40XX. Been 2 weeks, spent 400USD...

The Laptop SuperMG is speaking of is  Clevo P775TM and I think he designed custom water cooling for his laptop that Cicichen from ebay and Amazon is building for him

 

On 9/8/2026 at 4:36 PM, Siplast said:

(cicichen)

 

[Siplast]

I think he is water cooling to use a 4080 or a 4090 which would be 150w or better

[Siplast]

1 hour ago, Busta Bloodnut said:

On 9/8/2026 at 7:50 PM, SuperMG said:

you also need the better fan. (+10CFM)

 

Do you have a part no. or any more info on the fan you suggest.

[Siplast]

20 hours ago, Busta Bloodnut said:

you also need the better fan. (+10CFM)

Found the fan and thanks

[Busta Bloodnut]

36 minutes ago, Siplast said:

Found the fan and thanks

 

Could you link me that as well? Thanks.

[Siplast]

https://www.parts-people.com/index.php?action=item&id=11980

Here it is.