My PC crashes randomly at idle and while gaming, but seems stable when I force the GPU slot to PCIe 4.0 x16. The GPU is plugged directly into the motherboard, with no riser.
The system is about three months old and still under warranty. Does this point to a faulty GPU, motherboard, or CPU? Is it worth pursuing a repair if 4.0 works?
It points toward a problem with the PCIe 5.0 link, but it doesn't identify which part is responsible. The GPU, motherboard, CPU, firmware, or their interaction could all be involved.
Check for a stable motherboard BIOS update and current chipset and GPU drivers. If the crashes continue, document the BIOS settings and what happens at each PCIe speed. Testing the GPU in another compatible system, or another GPU in this one, could help narrow it down before a warranty claim.
PCIe 4.0 x16 is a reasonable workaround if the machine stays stable. The performance loss may be small, so there's no need to rush into pulling the system apart just to get 5.0 working.
That said, keep a record of the issue while the warranty is active. A workaround doesn't establish that the hardware is fault-free.
noodleproof:
That's the part I'm unsure about. It works at 4.0, but I don't love the idea of accepting a possible defect on a new system.
I'd contact the seller or warranty provider now rather than wait. A board and GPU advertised for PCIe 5.0 should be able to operate at that speed in a compatible setup, even if 4.0 is fast enough for your games.
Give them the crash symptoms and the result of forcing 4.0, but don't assume the motherboard is the defective part. Ask what tests they want before sending anything in.
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sparse__but_ready:
It's also worth telling support that the card is connected directly to the slot, so they don't spend time chasing a riser cable.