Hi,

I have a new (used) i9 9900kf. I’m testing it with various stress test tools, and I have a question: what is the normal temperature/frequency range for the cpu?

I have a stock Intel heatsink from an ‘old’ i7 8700.

I have a small undervolt of -50mV, if I do more (e.g. 80mV) the cpu crashes during the stress test. Probably I have a bad CPU :)

I limited the temperature to 85°C using intel-undervolt (Linux system).

Some seconds (half a minute?) after I launch a CPU stress test, the temperature goes to the limit (85°C) and of course it stays there for the full test duration. The frequency stays stable to 4.4/4.5GhZ on all cores.

I know that the Intel heatsink is pretty bad, so I’m assuming this is normal. At the moment I don’t care about it, I think it is normal for it to go at 4.4GhZ at 85°C with the default heatsink.

So, is this expected?

Thanks!

  • Cradenz@alien.topBEnglish
    1·
    10 months ago

    not normal. 9900k is supposed to be 4.8ghz all core with stock speeds. with overclocked its around 5-5.1ghz

    something else is going on. check bios settings. reset cmos and see if that fixes it. if not try updating bios.

  • Al-hwj@alien.topBEnglish
    1·
    10 months ago

    My 9900kf hit 90 degrees pretty often at 4.8ghz with a Dark Rock Pro 4 even 100 in summer.

    I’ve tried undervolt but got the same results as you -50mV max stable.

    So I guess it’s normal behavior for a 9900kf.

  • vivaramones@alien.topBEnglish
    1·
    10 months ago

    i9 9900kf is the same processor I have. This processor is not made for crappy coolers. This thing runs very hot and needs a ton of cooling. I would recommend an AIO or a very very very beefy huge cooler. I would recommend at least a 240mm AIO or a 200 watt air cooler.

    I have a Z63 NZXT and my processor runs 5Ghz all cores at 63 C.