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NVIDIA GeForce 840M Overclock

post #1 of 35
Thread Starter 
I"m overclocking my Acer Aspire E5-571G laptop, first the GPU. As i can see, the core clock is very high in sotck, the driver default overclock support let's me add an extra 135MHz. It's now 1259MHz, but the main issue is the Video Memory. It's stock speed is 900MHz, not so high. My overclock record is 1185MHz, but it depends on the temp. of the GPU. Normally, when it's around 50°C, it can go over 1200MHz, but at 78°C, (normal gaming temp.) it only goes up to 1185MHz. Do you have any experiences with this GPU, and how to overclock it more? Even BIOS mods are good for me. Sadly i can't take the stock vBIOS, GPU-Z says that it's not supported. But i've seen a few forum posts about modding the GPU's BIOS. So maybe if you can help me with the BIOS modding or default overlocks, I will be happy.
post #2 of 35
I can help, go to control painel , manege device and disable your gpu, now you can use gpu z...
post #3 of 35
Thread Starter 
It says that this GPU doesn't support BIOS reading.
post #4 of 35
i mean disable your gpu and try again...
post #5 of 35
Thread Starter 
I know, Ive tried it, it sayd that with disabled GPU.
post #6 of 35
Thread Starter 
Quote:
Originally Posted by AndreOliveira View Post

i mean disable your gpu and try again...

The Windows is in hungarian language, but i think you can see that it is still doing it. I've tried it with the GPU disabled while GPU-Z is running, and disabled before starting GPU-Z.
post #7 of 35
384 @ 1029 MHz HI donwload nvflash, Make a folder ind drive c: , go to that folder and tip nvflash --list . Can you see your card? Yes or not
post #8 of 35
Thread Starter 
Ok, thanks, i will try it in a moment. It is a BIOS mod, so it will apply to any OS installed on this machine, the GPU will controll itslef, and no OS-level tweaking needed, right? (Windows 10/Ubuntu 14.04)
post #9 of 35
Thread Starter 
Yes, i can see it.

C:\nvflash>nvflash --list

NVIDIA Firmware Update Utility (Version 5.236)
Simplified Version For OEM Only

NVIDIA display adapters present in system:
<0> GeForce 840M (10DE,1341,1025,0867) H:--:NRM S:00,B:03,PCI,D:00,F:00

C:\nvflash>
post #10 of 35
Thread Starter 
Quote:
Originally Posted by AndreOliveira View Post

384 @ 1029 MHz HI donwload nvflash, Make a folder ind drive c: , go to that folder and tip nvflash --list . Can you see your card? Yes or not
I can see a --save option for nvfalsh. Is that good for me? Or should we try to fix the GPU-Z problem?
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