Geforce 940m default vRAM frequency

[AlkaliX]

Hello All,

I'm keep using my new laptop Pavilion 15-ab208ur.

Now I'm researching the Video subsystem. It consist of Intel HD Graphics 520 and Nvidia GeForce 940M with 4Gb DDR3 vRAM.

I'm running some tests and see results lower than Nvidia Geforce 840M with 2GB DDR3 vRAM.

I made research and found that vRAM in my laptop operating at 900Mhz (1800Mhz effective) but as far as I know it should work at 1000Mhz (2000Mhz effective http://www.notebookcheck.net/NVIDIA-GeForce-940M.138027.0.html).

Is this only for 4GB version or 2GB version has the same downclocked vRAM?

Best Regards,

Alexey.

[AlkaliX]

After removing back cover of my laptop today I made a bit more research:

The video memory installed at my system is Micron D9PZM ( MT41J256M16HA-093G

https://www.micron.com/parts/dram/ddr3-sdram/mt41j256m16ha-093g)

From Micron official site we may see that default clock rate for the Micron D9PZM is 1000Mhz.
I'm not sure why it is set to 900Mhz in vBIOS as actually it should work at 1000Mhz.

The GPU is already has 64 bit memory bus so downclocked vDDR memory by effective 200Mhz is very upseting me.

HP laptops have very limited settings in the BIOS so possibly there are other components that were not tuned well but the end user can't change anything. This is very frustrating.

Is there are any way to unlock HP laptop's BIOS settings so end user can set all settings manualy?

[AlkaliX · Accepted solution]

Will reply to my question by myself.

It seems that HP locks the BIOS settings to avoid users to make damade to laptops by setting invalid BIOS settings.

There are no options to enable these parameters without modification manually laptop's BIOS ROM by using specific tools.