BSOD (Reason is completely unknown)

So,
some days ago i got Random BSOD (i thought Random), first i was thinking "Hmmm Propably some random Software issue" and i didnt even care but now i got almost everyday a BSOD. Just 1h ago i got one while watching Youtube and it didnt creat a dump file at all...

Here is the File:

EDIT: UPDATED 22.04.2016 (another BSOD)

• DESKTOP-OI3BEP2-22_04_2016_154605,11.zip (418.9 KB, 1 views)

Anndddd. Next BSOD:

• DESKTOP-OI3BEP2-21_04_2016_220255,69.zip (379.9 KB, 0 views)

All the crashes that have a dump saved are 0x124 which is basically a hardware crash, although it could also be something that lets the system think there is a hardware crash.
To start, please make sure your BIOS is up to date
P8P67-M | Motherboards | ASUS Global

The newest Driver is already installed (Bios Driver)

Current BIOS version

Code:

BIOS-Version:                                  American Megatrends Inc. 0901, 01.04.2011

BIOS version that is most recent: 3703 dating 2013/08/08

Current BIOS version

Code:

BIOS-Version:                                  American Megatrends Inc. 0901, 01.04.2011

BIOS version that is most recent: 3703 dating 2013/08/08

ok, now i have the newest Bios i am gonna let it idle for like 24h and see if its gonna crash, thanks for your help so far.

If another BSOD occurs, follow the BSOD Posting Instructions

Ok, i just got another BSOD:

• DESKTOP-OI3BEP2-22_04_2016_154605,11.zip (418.9 KB, 1 views)

I've gone a bit through the dumps, they're all showing generic errors on the level 2 cache of the CPU with core 3, this rises a flag for me with the CPU.

Diagnostic Test

 CPU TEST

Run Prime95 and/or IntelBurnTest to stress test your CPU. Prime95 - Stress Test Your CPU - Windows 10 blog CPU - Stress Test Using IntelBurnTest - Windows 7 Help blog

   Note

If you're overclocking anything, please stop it and set everything back to default while troubleshooting

   Warning

Your CPU temperatures will rise quickly while under this stress test. Keep a keen eye on them and abort the test if overheating occurs.

Code:

=============================================================================== Section 2     : x86/x64 MCA --------------------------- Descriptor    @ ffffe00078b15138 Section       @ ffffe00078b152c0 Offset        : 664 Length        : 264 Flags         : 0x00000000 Severity      : Fatal  Error         : GCACHEL2_ERR_ERR (Proc 3 Bank 8)   Status      : 0xbe2000000005110a   Address     : 0x000000017c7c1a80   Misc.       : 0x000000d086008086

i have currently my CPU undervolted to -0.215 and it was running fine for over 6 Months in Windows 7.... i am gonna Try to get it back as low as possible and stress test it, but the CPU Temps are pretty high even undervolted (The cooler is properly installed and there is enough Thermal paste but not to much.