— RX 9070 XT New Build, crashing across multiple games, exhausted all fixes. Need help.

Hey everyone. I built a brand new PC about a week ago and have been dealing with constant game crashes ever since. It’s not just one game — multiple titles are affected. I’m at my wit’s end after trying everything I can think of.

Specs:

∙	GPU: Sapphire Pulse RX 9070 XT 16GB

∙	CPU: AMD Ryzen 7 9700X

∙	Motherboard: MSI MAG B850 Tomahawk WiFi

∙	RAM: Corsair 32GB DDR5 6000MHz (in correct A2/B2 slots)

∙	Storage: Samsung 990 Pro 2TB NVMe

∙	PSU: Corsair RM850x 850W (second hand Amazon Resale — unused condition)

∙	OS: Windows 11 fresh install

The problem:

Games crash randomly — sometimes on launch, sometimes mid game. Dune Awakening is completely unplayable. Other titles also crash. Desktop and light apps work fine.

Everything I’ve already tried:

∙	Multiple fresh Windows 11 installs

∙	DDU clean driver wipe and reinstall across multiple driver versions (25.9.2, 25.11.1, 26.1.1, 26.3.1)

∙	Virtual memory increased to 16000MB manually

∙	Hardware Accelerated GPU Scheduling disabled

∙	All overlays disabled (Steam, AMD, Xbox Game Bar, Discord)

∙	Disabled integrated graphics through Device Manager

∙	BIOS already set to PEG for dedicated GPU

∙	High Performance GPU set to RX 9070 XT in Windows Graphics Settings

∙	Verified game files multiple times

∙	BIOS updated to latest version

∙	EXPO enabled — RAM confirmed running at DDR5 6000MT/s

∙	PBO enabled

∙	Two separate PCIe cables from PSU to GPU

∙	SFC /scannow and DISM health restore run

∙	GPU fully reseated

∙	RAM in correct dual channel slots A2 B2

Current suspicion:

Starting to wonder if the PSU is faulty. It came second hand from Amazon Resale but looked completely unused. & once I run dune and it crashes after few seconds, apps on pc start having issues like slowing down or crashing. Every game crash I have to restart pc. So far old games work but new titles I’ve tried simply dont.

TL;DR: Brand new build with RX 9070 XT crashing across multiple games. Fresh Windows, DDU clean driver installs across 4 different driver versions, BIOS update, all settings tweaks done. Second hand PSU now suspected. Desktop runs perfectly fine. Need fresh eyes.

Thank you 🫠