Question Help me please.

[Hannan_Persis]

Hello dear friends, I have a huge and annoying issue that I need to resolve, as a new student of hardware specialist I need help
I have a fairly old but serviceable gaming laptop, an ASUS FX553VD.
I just recently replaced one of my Rams (4 GB with a new 16 GB Dual)
everything works perfectly as always except one thing has changed, In certain games and software that take a longer loading time, I get a BSOD/ Video_TDR failure/ Nvlmkm.sys or something.
Before the upgrade when in heavy cases the loading took a long time, it would say not responding, and after a few seconds it would always work with no problem and even if I wanted I could exit the app with no problem, BUT now
if that happens and the app doesn't get itself together in 3-5 seconds it is a BSOD, even if I try to exit the app it freezes and causes it again, and no it's not the graphics card they work completely fine in the newest of games and software without any problem in long periods.
My theory is that the different ram speeds and the manufacturer are the culprits, Please HELP.
Now here are the specs...

Asus FX553VD
Graphics Card: Nvidia GTX 1050 TI 4GB VRAM
Cpu: Core I7 7700 HQ/ 2..80 GHz
Ram: 24GBs DDR4 Dual
Ram Sticks: 1-Samsung DDR4-2666/ 16GBs Dual - 1333MHz
3-SK Hynix DDR4-2400/ 8GBs Single- 1200MHz
PS. The motherboard has 4 slots for ram but only 2 ports exist, slots 1 and 3.

 

[logainofhades]

The mixed ram is probably the problem. Ram should always be in matched sets.

 

[Hannan_Persis]

The mixed ram is probably the problem. Ram should always be in matched sets.

Thank You, I gave the Laptop to the service center and they did this, did they not know or are they just trying to mess with me.LOL

 

[Bob.B]

Thank You, I gave the Laptop to the service center and they did this, did they not know or are they just trying to mess with me.LOL

Put a copy of memtest86 on a flash stick.
Boot the stick and let it run.
If you get any errors take the pc back to the service center and have them fix it.