6 Replies Latest reply on Mar 12, 2015 4:39 PM by R.stv

    Underclocking/undervolting CPU to reduce heat?

    R.stv

      I have the 4th gen i5 version of the NUC. I would like to reduce heat output and fan noise by reducing the performance of the CPU. Is this possible? I am running Xubuntu 14.04 so it already runs plenty fast at 1.3GHz. Thanks.

        • 1. Re: Underclocking/undervolting CPU to reduce heat?
          R.stv

          As a follow up to reducing fan noise, if I lay my hand on top of the unit, or set something like an empty glass on it, the sound is greatly diminished. Could this suggest a solution to the issue of fan noise, or imply a potential hardware problem?

          • 2. Re: Underclocking/undervolting CPU to reduce heat?
            Apachez

            According to some other posts Intel might have a QA problem regarding the quality of the fans used for their NUCs.

             

            Either you can RMA the unit to have it replaced or you can invest in a fanless chassis made for the NUC to properly solve the noise issue (by making the NUC completely fanless).

             

            I use a Akasa Newton X for my D54250WYK along with 2x8GB RAM Kingston HyperX and 1TB Samsung 850 Pro SSD:

             

            Akasa Thermal Solution

            • 3. Re: Underclocking/undervolting CPU to reduce heat?
              R.stv

              This looks like a great solution, though its a bit out of my price range right now. I am assuming that it will be safe to use a 2.5" HDD in that type of chassis? I was planning to get the 2TB drive by Samsung/Seagate eventually.

               

              Also, would the RMA process go through Intel? I originally bought it at Microcenter just this past weekend.

              • 4. Re: Underclocking/undervolting CPU to reduce heat?
                Wolf666

                Apachez can you share some operating temperature? Like gaming, playing HD content. Thanks.

                • 5. Re: Underclocking/undervolting CPU to reduce heat?
                  Apachez

                  Sure thing... these numbers are very approx but measured through Psensor in an up2date Ubuntu 14.10, the box itself sits ontop of my desktop next to my monitor. There is no additional fan(s) currently in the room and the room temperature is +22C.

                   

                  Within this box except for the NUC itself there is also 2x8GB Kingston HyperX and one Samsung 850 Pro 1TB SSD.

                   

                  There are several temp sensors, currently writing this in chrome with hexchat running in the background (in total 132 tasks according to htop with approx 1-2% cpu on all 4 cores (well this nuc has 2 cores but thanks to HT it shows as 4)):

                   

                  temp1 +28C

                  temp2 +30C

                  Physical id 0 +37

                  Core 0 +36C

                  Core 1 +36C

                  fan1 0RPM

                  fan2 0RPM

                  fan3 0RPM

                  SYSTIN +123C (I dunno what this actually shows)

                  CPUTIN +38C

                  AUXTIN +39C

                  PECI Agent 0 +37C

                  PCH_CHIP_TEMP +0C

                  PECI Agent 1 +0C

                  PCH_CPU_TEMP +0C

                  cpu usage 6%

                   

                  After playing a 1080p HD-clip at youtube in fullscreen for 3 minutes (Måns Zelmerlöw - Heroes (Official Video) - YouTube) the CPU temps are between +40-45C.

                   

                  Going for Left 4 Dead 2 in windowed mode (but fullscreen that is 1680 resoltion) the temps are between +45-65C (average +50-55C).

                  • 6. Re: Underclocking/undervolting CPU to reduce heat?
                    R.stv

                    Thanks for the information. From my readings elsewhere on here, I think that SYSTIN value can be ignored as it represents a non-functioning sensor