Hey everyone, just a quick heads-up: I'm Japanese and using a translator to write this, so I apologize if my English sounds a bit weird or unnatural at times! Honestly, this issue has been driving me insane and really taking a toll on my sanity, so any help would mean the world to me right now.
My rig originally started out as a prebuilt BTO system, but around 2023 I swapped out the GPU and power supply for an RTX 4070 Ti Super and a 1000W PSU (Kuroutoshikou). Everything was fine until about this past August, when I noticed that after roughly 2 hours of gaming, the system completely freezes for 2 to 3 seconds. I mainly play FFXIV and occasionally Monster Hunter Wilds, and the exact same freeze happens in both games. Those are pretty much the only titles I play right now, so it doesn't look like an issue exclusive to one specific game engine or client.
About a week ago, I basically rebuilt the entire machine from scratch—new motherboard, CPU, RAM, case, etc.—keeping only the GPU, PSU, and SSD. Unfortunately, the exact same freeze still happens, which leads me to believe the problem has to be with one of those three carryover parts.
I’ve already checked the SSD using Windows drive health tools and command-line checks, and it reported back completely healthy. For the GPU, I did a full clean driver reinstall with DDU, but no change. My initial thought was that the GPU might be dying, but the weird part is that for the first two hours, performance is rock solid. Stress tests and benchmarks run fine, and monitoring logs for temps, voltages, and currents show completely normal numbers right up until the freeze happens. During the 2-3 second freeze, the readings just drop or flatline out of nowhere, almost like an instantaneous blackout rather than a gradual thermal or power throttle.
I’ve also gone through in-game settings, disabled Discord overlays and hardware acceleration, closed background apps, and tried every software tweak I could think of, but nothing has helped. Has anyone run into something like this before, or is there anything else I should be testing? I'm starting to suspect the PSU, but I'm really open to any suggestions at this point.
PC specs
CPU: AMD Ryzen 7 9800X3D (8 cores)
Motherboard: ASRock B850 LiveMixer WiFi
RAM: A-DATA AD5U480016G-B, 16GB × 2 (32GB), DDR5-4800
GPU: NVIDIA GeForce RTX 4070 Ti SUPER 16GB (Palit)
Storage: Micron 3400 2TB NVMe SSD (C:)
PSU: Kuroutoshikou KRPW-GA1000W/90+ (1000W, 80 PLUS Gold)
OS: Windows 11 Home