My rig shuts down when I start mining

[Args]

Please, I need help. My rig shuts down every time I apply a flightsheet. These are my specs:

1X ASUS RTX 2060 DUAL 6GB EVO / 2X ZOTAC GTX 1660 SUPER
Intel Celeron G5920 3.5 Ghz Comet Lake
ASUS PRIME Z590-P
RAM CRUCIAL 4GB DDR4 2666
SSD Kingston A400 120 GB SATA
750w Gigabyte P750GM 80+ Gold

4G decoding is enabled. PCIe speed is set to Gen1.
I have not applied overclocking to any card.

[keaton_hiveon]

No oc = bad oc.
Have you tried setting conservative clocks instead?
What does the miner say before it shuts down?
Any error messages?