Lockups During Memtest and Mem Diagnostics

[FreeerunFlame]

I've been experiencing random lockups (mouse and keyboard both unresponsive) requiring hard reset. Sometimes it runs for hours without issues and sometimes it locks up minutes after login.

So I ran windows 10 memory diagnostics and it locked up during the extended test at 21%, the standard test ran smoothly but failed to show any result upon re-login. For memtest, it freezes near the end of the first pass twice (at two different points of the test & different CPU modes: parallel and single core).

I'm using 2x Corsair Vengeance PC12800/1600MHZ 4GB (CL9)
1x G Skill NT PC12800/1600MHZ 4GB DDR3 (LLT)
they are both at 1333MHz according to the bios (in auto mode: Asus Maximus Ranger VII) does this affect anything or is one of my DIMM faulty?

Thanks in advance


PC specs:
CPU: Intel i7-4790 3.6GHz
GPU: GTX 780 Direct CU II 3GB
Mobo: Asus Maximus Ranger VII
PSU: Corsair RM650
RAM: 2 x Corsair DDR3 4096MB + 1 x GSkill Intl DDR3 4096MB
CPU Cooler: Cooler Master Hyper 212X
OS: Win 10 x64 Home
+ N14 ASUS USB Wifi Dongle

 

[burgessanthony]

Mixing RAM...not a good idea. Get rid of the G skill.

 

[FreeerunFlame]

Mixing RAM...not a good idea. Get rid of the G skill.

I've been using the mixed rams for quite before the freezing started. when you mean mixing rams, do you mean the RAM manufacturer? if i buy other corsair RAMs does it have to be the exact same model as the others?