Sorry for English. I will understand anything you answer in English, German or Russian 
My system:
[CPU] i3-8350K 5200 MHz @ ~1.36V LLC6 (see below)
[CPU COOLER] Scythe Mugen 5 (Kaze Flex x2)
[GPU] GTX 1050 Ti STRIX OC
[MB] ASUS Z370-A PRIME
[RAM] 2x8 Gb 3000MHz CL15 VENGEANCE LPX
[SSD] SAMSUNG 960 EVO 250 GB
[PSU] Chieftec GPS-650C
[CASE] Thermaltake F31 Supressor (TY-147A x3)
Well, here is the story how (as I currently think) overclock disrupts SSD work:
I have a 960 EVO. It is NVME and is plugged in lower M2 slot (one under the Z370-A PRIME heatsink) in PCIE x4 mode. A few weeks ago I tweaked my system VCCIO/VCCSA and made them lower, which allowed me to set even lower Vcore. PC was tested with an 1 hour of Prime 95 ver. 26.6 1344k (non-AVX) and was stable. Also i played BF1 alot (for two weeks or so) and system behaved well too.
Settings were the following:
Vcore 1.355 (5.2 GHz) LLC6, CPU-Z vcore 1.34-1.36 or so.
VCCSA 1.15
VCCIO 1.15
0430 bios (a bit dated).
Memory stock XMP 3000 MHz 15-17-17-35
And everything was OK for about 2 weeks until I installed Lineage 2 (game which is known for severe hard disk/SSD abuse due to poor and obsolete design). I launched it and started to have random hardlocks (everything doesn't move, sound buzzes). Hard locks happened when the game loaded large pieces of terrain.
I tried to test my SSD but I have no idea how to do it better so I just launched Samsung Magician Benchmark and ASS Benchmark. The results are below:
VCORE 1.355
Samsung Magician stops at 35%, 1 min no progress, and then bsod "dpc watchdog violation".
ASS Benchmark - hardlock at 4k-64rd
VCORE 1.365
Samsung Magician stops at 39%, 1 min no progress, and then bsod "dpc watchdog violation".
ASS Benchmark - passes, works good
VCORE 1.37
Samsung Magician - pass
ASS Benchmark - pass
RAM in stock (2133) doesn't help. Bumping IO/SA voltage to default 1.32/1.22 don't help either.
What I'm going to do:
1) Take old SATA SSD and test wether it will be stable. Old SSD is Crucial M4 so I won't be able to use Samsung Magician bench
2) Really don't know.
I want to ask you guys if you have encountered something similar before, maybe you will advice something...
a) What voltage apart VCORE I can bump to stabilize it? Is adding VCORE is right at all (really fixes problem not walkarounds it)?
b) What are good things to check my SSD for good condition and stability? If it has stability at all or it is thing between it and CPU which causes the problem?
c) Current SSD is too small (250 GB) and I wanted to change it for 500GB, what can you recommend? I don't know much about this TLC/MLC stuff... I don't mind SSD resource being lower but when it causes hardlocks it pisses me off (know probably it's my faulty settings somewhere but still)...
d) Read somehwhere (don't laugh) that in one SSD slot SSD is conneced top CPU "directly" while another uses "southbridge" to connect it to CPU. Is that true?
My system:
[CPU] i3-8350K 5200 MHz @ ~1.36V LLC6 (see below)
[CPU COOLER] Scythe Mugen 5 (Kaze Flex x2)
[GPU] GTX 1050 Ti STRIX OC
[MB] ASUS Z370-A PRIME
[RAM] 2x8 Gb 3000MHz CL15 VENGEANCE LPX
[SSD] SAMSUNG 960 EVO 250 GB
[PSU] Chieftec GPS-650C
[CASE] Thermaltake F31 Supressor (TY-147A x3)
Well, here is the story how (as I currently think) overclock disrupts SSD work:
I have a 960 EVO. It is NVME and is plugged in lower M2 slot (one under the Z370-A PRIME heatsink) in PCIE x4 mode. A few weeks ago I tweaked my system VCCIO/VCCSA and made them lower, which allowed me to set even lower Vcore. PC was tested with an 1 hour of Prime 95 ver. 26.6 1344k (non-AVX) and was stable. Also i played BF1 alot (for two weeks or so) and system behaved well too.
Settings were the following:
Vcore 1.355 (5.2 GHz) LLC6, CPU-Z vcore 1.34-1.36 or so.
VCCSA 1.15
VCCIO 1.15
0430 bios (a bit dated).
Memory stock XMP 3000 MHz 15-17-17-35
And everything was OK for about 2 weeks until I installed Lineage 2 (game which is known for severe hard disk/SSD abuse due to poor and obsolete design). I launched it and started to have random hardlocks (everything doesn't move, sound buzzes). Hard locks happened when the game loaded large pieces of terrain.
I tried to test my SSD but I have no idea how to do it better so I just launched Samsung Magician Benchmark and ASS Benchmark. The results are below:
VCORE 1.355
Samsung Magician stops at 35%, 1 min no progress, and then bsod "dpc watchdog violation".
ASS Benchmark - hardlock at 4k-64rd
VCORE 1.365
Samsung Magician stops at 39%, 1 min no progress, and then bsod "dpc watchdog violation".
ASS Benchmark - passes, works good
VCORE 1.37
Samsung Magician - pass
ASS Benchmark - pass
RAM in stock (2133) doesn't help. Bumping IO/SA voltage to default 1.32/1.22 don't help either.
What I'm going to do:
1) Take old SATA SSD and test wether it will be stable. Old SSD is Crucial M4 so I won't be able to use Samsung Magician bench
2) Really don't know.
I want to ask you guys if you have encountered something similar before, maybe you will advice something...
a) What voltage apart VCORE I can bump to stabilize it? Is adding VCORE is right at all (really fixes problem not walkarounds it)?
b) What are good things to check my SSD for good condition and stability? If it has stability at all or it is thing between it and CPU which causes the problem?
c) Current SSD is too small (250 GB) and I wanted to change it for 500GB, what can you recommend? I don't know much about this TLC/MLC stuff... I don't mind SSD resource being lower but when it causes hardlocks it pisses me off (know probably it's my faulty settings somewhere but still)...
d) Read somehwhere (don't laugh) that in one SSD slot SSD is conneced top CPU "directly" while another uses "southbridge" to connect it to CPU. Is that true?
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