mersenneforum.org How to lower cpu usage?
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 2021-10-14, 10:14 #1 ProbableUser   Oct 2021 216 Posts How to lower cpu usage? Hi, i just installed gimps and it said it uses the energy of a small lamp. But actually my CPU is running on 50% and the fan is very loud. How can i change that?
 2021-10-14, 13:36 #2 Uncwilly 6809 > 6502     """"""""""""""""""" Aug 2003 101×103 Posts 13×19×41 Posts Welcome to the forum and GIMPS. Prime95 is designed to use all of you CPU capacity (the 50% is just the machine pretending it has more CPU than it does [hyperthreading].) Prime95 does have a setting that you can use to reduce the amount of time it uses the CPU. Here is the section about it in the undoc.txt file that comes with Prime95 Code: If you are running on a laptop or in a hot room and you want to slow the program down to reduce heat, then you can add this line to prime.txt: Throttle=n where n is the percentage of time the program should run. For example, Throttle=40 means the program will run 40% and be idle 60% of the time. Hope that can get the noise down some. Also, if this is an older machine, consider opening the case and cleaning out any dust.
 2021-10-14, 13:57 #3 kruoli     "Oliver" Sep 2017 Porta Westfalica, DE 28·3 Posts If you have interest/experience in underclocking and undervolting, this might give you a larger decrease in power usage than in throughput. You might even be able to keep your throughput and lower the power usage somewhat. But be warned, this may cause instabilities and/or errorneous calculation results!
 2021-10-14, 15:19 #4 Prime95 P90 years forever!     Aug 2002 Yeehaw, FL 11110000010112 Posts Better than Throttle=n is to reduce the number of worker windows and/or the number of cores used by each worker. This can be done from Test/Worker Windows dialog box. Though, undervolting and underclocking is the best solution. Welcome to the forum!
2021-10-14, 20:09   #5
ProbableUser

Oct 2021

28 Posts

Quote:
 Originally Posted by Prime95 Better than Throttle=n is to reduce the number of worker windows and/or the number of cores used by each worker.

Hey thank you, that fixed it!

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