Understanding the 0x133_ISR_nvlddmkm!unknown_function Error and Its Connection to Overheating in Mini-ITX Builds
Introduction
Building a high-performance PC with a compact Mini-ITX case and a powerful GPU like the NVIDIA GeForce RTX 4080 Super can deliver exceptional performance, especially during intensive tasks like rendering. However, such setups can sometimes encounter stability issues, such as unexpected shutdowns and error messages. One common error that users report is related to the 0x133_ISR_nvlddmkm!unknown_function code, often accompanied by sudden black screens and system restarts. In this article, we explore whether overheating might be a contributing factor and how to address this problem effectively.
Overview of the Error
The 0x133_ISR_nvlddmkm!unknown_function error pertains to a hardware or driver-level issue, typically associated with the GPU. It is often reported in event logs or as part of system crashes, and can manifest as:
- Sudden system shutdowns or restarts
- Black screens during high load
- Fan speeds increasing dramatically prior to shutdown
- No Blue Screen of Death (BSOD) visible
Unlike typical BSOD crashes, this error can cause the system to reboot abruptly, with fans running at maximum speed until the system restarts.
Case Study: Mini-ITX Build with RTX 4080 Super
Consider a user with a compact Mini-ITX build equipped with an RTX 4080 Super during intensive rendering sessions. After approximately one hour under load, the computer shuts down unexpectedly. The issue initially emerged after the user increased rendering durations, moving from shorter to longer sessions.
In an effort to mitigate the problem, the user opened the case’s vent side panels to improve airflow, which seemed to eliminate the crashes for a period. Over multiple occurrences (six times prior), adjusting ventilation appeared to help. Interestingly, during the last crash, thermal monitoring via Armoury Crate indicated that:
- The GPU remained below 90°C
- The motherboard was at 61°C
- Other internal components were within safe thermal ranges
This suggests that while high temperatures might seem the obvious culprit, actual thermal stress might not be the sole cause.
Is Overheating the Culprit?
While overheating is a common cause of system instability, in this scenario, thermal readings suggest that temperature alone may not fully explain the crashes. The GPU temperature remaining below critical levels indicates that other factors—such as driver issues, power
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