I'm experiencing two issues, which I suspect are related.

I have two RB450Gs as follows:

RB450G 1:
- V6.2, FW 3.0.7
- Standard aluminum case
- Indoors in an air-conditioned room
- Basic config: Masq, DHCP, firewall, no hotspot/connection tracking
- ~10-20 users
- 15Mbps or less of WAN traffic at any given time
- 12V power supply, /system health shows 12.7V
- Average operating tempurature: ~70C at boot to 90C during CPU issue
- Unit is placed on top of a DSL modem

RB450G 2:
- V6.2, FW 3.0.7
- Standard aluminum case
- Indoors in a non air-conditioned room
- Basic config: Masq, DHCP, firewall, no hotspot/connection tracking
- No users at this moment (lab setup)
- No/minimal traffic
- 25V power supply, /system health shows 25.4V
- Average operating tempurature: ~54C
- Unit is placed on top of a server in a rack


The issue I'm experiencing pertains to RB1. RB2 was purchased as a backup for RB1 and has virtually the same configuration, just no users or traffic. I'm using it as a comparison to troubleshoot RB1.

The problem is, RB1's temperature runs significantly hotter than RB2, despite being in an air-conditioned room. It boots at about 70-72 degrees, which is fine, but over time, will climb up into the high 80's to low 90's. About that same time, the CPU utilization will go from 0-2% average that I'm used to seeing, to 100% solid. /tools profile shows 89%+ being used by "Unclassified" during this time. A power cycle or /system reboot resolves both issues for a few days or weeks, then resurfaces. I don't currently graph CPU utilization or temperature on this box, so I'm not sure if it's creeping up, or jumping up to 100% when the problem occurs.

Either way, the board temperature and the CPU utilization seem to be correlated; I would take that to mean the temperature is causing the CPU voltage to drop, causing a lower operating frequency and a higher utilization, but that doesn't explain why a /system reboot would fix it as the actual temperature would be the same.

I guess my questions are:
- What's the expected operating tempurature to be for the RB450G?
- Could the voltage of the PSU I'm using be contributing to the issue?
- Why would a reboot 'solve' the temperature problem (at least temporarily)?

Bump, anyone?

To rule out the possible difference between power supplies, you could try to swap them and see how it goes. Basic electrical rules indicate that if volts go down, current goes up to have same power. More current could result in more temperature.
P.s. I hope you are referencing to Fahrenheit temperatures

Thanks, I'll give that a try. RB1 is remote, so it might be awhile before I can get to it to swap the PSU.

And no, unfortunately not, I was referring to Celsius, temps were copied straight out of terminal /system health print