For a disk I/O spike, look for STATE = disk and high %CPU (waiting for I/O). Use iostat view to confirm.

Some versions include a net view. In hot mode, you can see packet-per-second counts bounce with every incoming ping or web request.

Unlike top, systat shows memory in a historical wave format. hot mode makes the page-in/page-out rates feel almost real-time. If you see pgin or pgout spiking every second, you have memory pressure.

If you suspect your unit is "SYSTAT 132 hot," follow this immediate action plan.

If your SYSTAT 132 remains "hot" after cleaning and voltage checks, the internal thermal paste between the CPU and heat sink has likely dried out (cracking). While a technically skilled user can reapply Arctic Silver thermal paste, SYSTAT recommends board-level replacement for units over 10 years old. Refurbished power boards for the 132 series are available for roughly $400–$600.

When systat 132 hot shines: Narrowing down a transient spike that top misses because its update interval is too slow. When it fails: on Linux, where you’ll need htop with I/O columns enabled.

Now go watch your system run hot.

The SYSTAT 132 motherboard contains a thermistor (thermal resistor) located near the voltage regulator module. When the ambient internal temperature exceeds 85° Celsius (185° Fahrenheit) , the system logic interprets this as "Hot" and does one of two things: