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However, if you're wanting to use it, then you need to run it for at least 3hrs. So, for me, prime95 is the wrong tool for the job you're trying to perform (but that's a personal opinion). The reason it's popular for stability testing is because users will overclock their CPUs and then need a way to test how stable they are afterwards. Prime95 can be useful for determining stability, but I'm not particularly a fan of it as a troubleshooting/diagnostic tool. Reaching a temp of 95☌ is not surprising if the CPU is under heavy load for a prolonged period. Seems wrong to me, but who am I to argue with Intel? Apparently Intel claims its temperature spiking to 90 C during normal use and hitting 100 C during heavy use is normal. So no worries there.Įdit 2: After doing more research I've discovered this is a widespread issue with the Intel Core i7-7700k, and affects all iMacs that have it. Is that temperature too hot, or is this normal for an iMac?Įdit: After the system was idling all night the temperature went down to 45 C, which is of course a good idle temperature. I stopped prime95 and after my system was idle for a little while the core temperatures are now hovering around 60 C. Ordinarily I'd think that's way too hot but with the design of the iMac I'm not sure. So to see if there's a hardware issue, I started running prime95 in stress test mode to see if any errors were detected.Īfter running for about 20 minutes, I checked the core temperature readings for my CPU and they were all hovering around 95 C. It's been having some issues lately where every now and then the entire system will gradually freeze, forcing me to hard reboot the computer.
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He suggested that if I wanted to turn it back on, to download all my iCloud documents, delete them from iCloud and slowly put them back, while watching Activity Monitor for runaway processes.I have a 2017 27" iMac with a 4.2 GHz Intel Core i7.
I really don't use "Documents & Data" iCloud syncing on OS X (while I do on my iOS devices) so I'm ok with leaving it turned off for the time being, but the genius suggested that it could be a corrupt iWork file that iCloud is trying to sync. Unchecking "Documents & Data" made the process go away and the fans spin at a much more reasonable (and quieter) speed. no runaway processes) until we checked the box for "Documents & Data."Īs soon as we checked the box for "Documents & Data" the udb process spawned and jumped to the top of the "% CPU" list and the fans kicked on. With Activity Monitor open, we slowly turned on iCloud sync items one at a time, and everything was going great (i.e. The solution was to sign back into iCloud and uncheck all the options. Signing out of iCloud (in System Preferences) effectively killed the runaway "udb" process, but wasn't sustainable long term as a I use iCloud on a daily basis for Mail, Contacts, Calendars and Photo Stream. The Genius at my local Apple Store narrowed "udb" down to something to do with iCloud syncing.
The problem is that simply killing the process didn't help, it would immediately respawn and peg the CPU. It immediately pegged the CPU at over 100 percent and kicked the fans into overdrive. I identified a process called " udb" that only spawned when my rMBP was connected to a Thunderbolt display. To troubleshoot the noisy fans, I opened Activity Monitor and sorted by the column labeled "% CPU" to identify any runaway applications, which can shorten battery runtime, affect performance, and increase heat and fan activity, as documented in Apple knowledge base article TS1473. The fans increase in speed as more CPU cycles are used and when the temperature rises. Point of order: According to a Genius at my local Apple Store, the fans in all MacBooks run any time that it is powered up, but at a very low (and quiet) speed.
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Needless to say, excessive fan noise is extremely distracting and it got to the point where I couldn't hear the TV over the blaring fans in my MacBook. Almost immediately after installing 10.8.4 the fans in my rMBP would run at almost top speed every waking minute.
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Until shortly after the time the OS X 10.8.4 update came out, that is.
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I use a MacBook Pro Retina 13-inch as my primary Mac and love it. White House: Brace for potential Russian cyberattacksĤ1 impressive questions to ask in a job interviewĪpple's largest laptop adds Touch Bar support for serious design apps
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