Question gtx 970 with galax A320m

[YanCOM&PRO]

My PC with GTX 970 goes blank and my pc hang, when I render using gpu render like Lumion, V-Ray, etc, even when i goes to game, it always Blank screen and hang
my gtx 970 temp. max only 55° c, and work in PCI-E X16 3.0 @X16 3.0 in GPU-Z
and its blank and hang….😣😣😣

Before I upgraded to GTX 970, my PC use GTX 670 and it's fine all, but my GTX 670 work in PCI-E X16 3.0 @x4 1.1 in GPU-Z

my CPU spek now :
Motherboard AM4 Galax A320M
Ryzen 7 Pro 1700x with custom watercooling
RAM DDR4 16 (2x8GB) 2666mhz
gtx 970 updgraded with custom watercooling
NVME SSD 512GB
HDD 2TB
PSU Corsair RM850x
2 Monitor
1 1920x1080 @75hz
2 1920x1080 @60hz

Please any solution...????

 

[wilds]

If you use MSI Afterburner to force the 970 to 50% power limit does it still crash?