Have you checked this thread where there’s discussion of DPC_WATCHDOG_VIOLATION blue screens? A lot in that thread is pointing at possible iGPU driver issues. Perhaps your case might be related (especially if your memory checks out, though it’s not the recommended speed).
Also, if you have dump files, could you trace down the problem through WinDbg? That might give you a clearer indication of what might have led to the watchdog error.