troubleshoot Build restarts under load

[Stephencatel]

Hello,i am a beginner in the pc building field, and i decided to change graphic card about 4 weeks ago, from a gtx 960 2 (msi) go to a 1070 i (gigabyte), a week ago i received a new processor (9600KF) and a msi Z390 a pro motherboard, the 1070 ti and motherboard were bought used, the problem is when i installed the new board and processor, despite running great, with seemingly good temps, under 70° C for bothCPU and GPU, my pc restarts when gaming, and sometimes when idle, i tought it was a PSU issue, my psu was a raider S550, which was like 4 years old, so i bought a cx750, but still the same problem, i tested a bunch of stuff, but nothing worked, so i went to my previous config (+1070ti) but despite running fine before i changed motherboard, i experience the same restarts with the old motherboard now, so i don't get it, only config that works is the stock one.

Config one (stock) = works normally

Mobo : MSI B150 gaming M3

MSI GTX 960 2 go

Intel I5 6600k (Be quiet pure rock cooler)

32 go LPX Corsair RAM (2400)

Corsair CX750m or Raider S550 (both works)

Samsung SSD 860 evo 500Gigs

Seagate HDD 1TO (desktop)

 

Config 2 = works initially but now restarts while gaming and OCCT graphic stress test

Mobo : MSI B150 gaming M3

Gigabyte 1070 Ti

Intel I5 6600k (Be quiet pure rock cooler)

32 go LPX Corsair RAM (2400)

Corsair CX750m or Raider S550 (Raider worked initially but i haven't test it again)

Samsung SSD 860 evo 500Gigs

Seagate HDD 1TO (desktop)

 

Config 3 = always experienced restarts (gaming and idle)

Mobo : MSI Z390 A pro

Gigabyte 1070 Ti

Intel I5 9600KF (Be quiet pure rock cooler)

32 go LPX Corsair RAM (2400)

Corsair CX750m or Raider S550 (Same result)

Samsung SSD 860 evo 500Gigs

Seagate HDD 1TO (desktop)

 

BIOS and graphic driver updated, fresh windows install on each config

 

What course of action can i take to troubleshoot ?

Is the CX750M still not enough ? I know they doesn't get good reputation, if so, what can i get instead ? I can still return the cx750

I have HWinfo64 installed and i can provide log before crash for config Z (currently installed)

Thanks for reading me, and to those willing to help me, have a nice day

Log Idle.CSV Log OCCT (crash).CSV