New build keeps shutting down

[obsweats]

Hi all,

I am having some difficulty since upgrading the core of my PC

I recently added a new motherboard, graphics card, processor and RAM

When gaming, my PC will suddenly turn itself off without warning. It seems to happen mostly on higher graphics settings. This happens every 30 - 40 minutes.

As far as I can ascertain, my PSU is the correct wattage and I think its unlikely to be failing as it wasnt a problem before the upgrade a week ago.

I have tried reinstalling the graphics card drivers to no avail. The fans are working well on the graphics card and PSU, so I doubt its a heat issue especially as I am not overclocking. Is there a way to check this?

I am using a cable which splits to 2x 6+2 heads to connect the PSU to the 8 and 6 pin plugs on the graphics card, should I be using 2 cables instead?

Any advice on what to check next? From my research, it may be a problem with the RX 5700 XT, if so does anyone know a workaround or should I return it for a different card?

My build

Processor: AMD Ryzen 7 3700X Eight Core 4.4GHz (Socket AM4)

MB: MSI B450 Tomahawk Max (socket AM4) DDR4 ATX

Memory: Patriot Viper Steel 16GB (2x8GB) DDR4

Graphics Card: Gigabyte Radeon RX 5700 XT Gaming OC 8GB GDDR6 PCI-express

SSD 1: Samsung 860 EVO 500 GB SATA 2.5" Internal SSD
SSD 2: M.2 Sabrent Rocket 2280 SSD 1TB (plugged in but not set up as yet)

HDD: Hitachi HDS72101 1TB

DVD/BLU-RAY Drive 12x BLU-RAY ROM DRIVE, 16x DVD ±R/±RW

Power Supply Superflower Leadex Gold 550W "80 Plus" Power Supply

Processor Cooling INTEL SOCKET LGA1155 STANDARD CPU COOLER

1440p Monitor

 

[obsweats]

Just to update, Event viewer reports a critical error at the time of the most recent crash

Event ID 10110 :A problem has occurred with one or more user-mode drivers and the hosting process has been terminated. This may temporarily interrupt your ability to access the devices.

this seems to imply a problem with the graphics card driver? Would that explain crashes mid game on higher settings?

 

[EsaT]

I am using a cable which splits to 2x 6+2 heads to connect the PSU to the 8 and 6 pin plugs on the graphics card, should I be using 2 cables instead?

Any higher power draw card should be used with two completely separate power cables.
Using one split in the end cable doubles voltage losses not only for 12V wires, but also also for ground wires compromising ground reference.
The former definitely puts graphics card's VRM under more stress and the latter could increase problems besides certainly not being helpfull for logic level operation.