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Cake day: October 28th, 2023

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  • merkuron@alien.topBtoHomelabNUC 13: Random Freeze
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    10 months ago

    Number one cause of random hard crashes/hangs is RAM. Re-seat it, replace it, down-clock it, run a single stick, do everything you can to either rule it out as a problem, or to isolate the problem to a particular module or channel.


  • Maybe it’s clear this way:

    For every 2 lanes you want allocated to the PCIe slot (up to 4), you lose two SATA lanes. Since there are 8 lanes total, but 12 possible lane destinations, they pre-made combinations of destinations that they think would be useful:

    • All 8 lanes to SATA, 4 onboard and 4 through MiniSAS
    • 2 lanes to PCIe and 6 to SATA, 2 onboard and 4 through MiniSAS
    • 4 lanes to PCIe and 4 to SATA, either activating the 4 onboard ports or the MiniSAS (but not both)



  • CPU1 handles almost everything about being a normal computer: booting, chipset, most of the I/O, etc. CPU2 is along for the ride and handles its own I/O lanes (PCIe) and whatever work the kernel wants to send to it. The load is not symmetrical, so if you have turbo enabled, CPU1 will be consistently boosting more than CPU2 as it is handling all of its tasks —> warmer CPU1. This is why “tandem” dual-CPU setups have CPU1 upstream in airflow from CPU2.








  • merkuron@alien.topBtoHomelabPlease help me with my Epyc build
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    10 months ago

    Is your RAM on the QVL? Ryzen’s notorious pickiness about RAM carries over to TR and EPYC, too. One of the first things before POST and BIOS splash display is memory training. If it can’t get past that, something about memory needs adjustment. Have you tried downclocking it?




  • E3-1230v2 is completely different to an E5v2 or an E5v3. The E3’s were all 4-core dies. E5’s were built from two different dies, both of which had well more than 4 cores. The chipset is different between E3 and E5, the memory controller is different, and the PCIe lane count is different. You can’t directly compare an E3 to an E5.

    Idle power can be estimated (CPU+RAM+chipset+drives+GPU), but is also majorly affected by:

    • Efficiency of the PSU: big OEMs were pretty good about putting efficient PSUs in their workstation products, but below 10% of rated load capacity, efficiency will be crap. Exactly how crap, depends on the specific PSU.
    • BIOS settings: there are a dozen different BIOS settings that can dramatically change how the CPU behaves, and the defaults vary for each system. Sometimes the defaults do not allow the processor to throttle all the way back under low load.

    Your measured power consumption of 100W at low/no load is about what I’d expect. Can you reach lower? Maybe with the right combination of settings, and switching to slower/lower voltage memory, and making sure that the GPU is also throttling down, you could reach 65-80W idle. But I wouldn’t expect less than that.