Some of the staying cool with that processor could be related to the lack of hyper-threading in the 2019 i5 series. I ended up getting rid of my 2019 i5 6 core 3.7G because while I agree it stayed cooler I found it to be very underpowered.
Got a tip for us?
Let us know
Become a MacRumors Supporter for $50/year with no ads, ability to filter front page stories, and private forums.
Alarmingly High CPU Temperature on 2020 27" iMac
- Thread starter 1229175
- Start date
-
- Tags
- cooling cpu imac temperature
- Sort by reaction score
Some of the staying cool with that processor could be related to the lack of hyper-threading in the 2019 i5 series. I ended up getting rid of my 2019 i5 6 core 3.7G because while I agree it stayed cooler I found it to be very underpowered.
The 6 core was such a nice jump from my previous 4-core iMac that for me it didn't feel anywhere close to being 'underpowered'. Plus the vega 48 gave me a similar leap on the graphics side.
As it is, I can edit 4k on the timeline in premiere pro in full resolution with no lag, so that's really all the power I need.
So bottom line, it's more than fast enough for my uses, and it runs a good bit cooler than the i7 or i9. Really a slam dunk thumbs up from me.
Well, I think the 580x would still have been fast enough for smooth 4k editing in premiere.
But the real difference may be, I swapped out the spinning sata disk part of the fusion drive with a SATA ssd. If you had the standard fusion drive model I do think those feel dog **** slow in comparision.
Respectfully, it's completely on point and I doubt you have any data to support your statements, whereas we do. 100C is very hot and the throttling, if it behaved the way you say it does, would have kept those Mac's from killing themselves.
100C is just a number on a spec sheet. Lower heat is ALWAYS better ... and the real world is a spectrum of consequences, not a binary if/then. The real question is how much worse does the failure rate over time get as you approach 100C? And Intel doesn't give you that number.
The fact is that no one who builds PC's for themselves targets 100C as their running temp. Throttling is a safety mechanism for preventing your CPU from exploding right then and there, but does hitting that limit constantly affect the lifetime for the device in a very noticeable way? Absolutely.
That’s what I was waiting for. I have an aging, but quite functional, ‘13 MP. I was ready to replace it, and the iMac form factor seemed the only choice. I was expecting that if we didn’t see an updated iMac Pro, it would be because they moved the pro cooling system into the base iMac. I’ve heard the fan in the 2017 iMac and don‘t want to put up with that.
My MP’13 is whisper quiet. I love that thing. The only thing it lacks is hardware acceleration for H.265, but I’ll hold out until I can replace it with a machine I’ll be happy with.
No issues so far, though I’ve only had the machine three days now. Just curious, what is your RAM setup like in your machine? You just using Apple stock RAM or did you augment or switch with other RAM you bought?
Is it possible to run a MEMTEST86+ on a Mac ??? lol Might be your problem. Bad memory stick.
A MemTest86+ can take days on a 32 GB kit. It tests a lot more thing than Apple can do in a 3 min self-test.
Someone here had panics to the point they returned the machine. Their second one seems to have no crashing issues. Can’t remember which thread this is documented in, or I’d put the link here.
Had trouble running memetest86 on the 2020 iMac.
Anyone successfully get it to run and test their ram?
Nice, I have basically the same setup incoming but I added a 1TB SSD. I also bought 2 32GB Samsung RAM sticks to load in. How's the RAM running for you? Did you mix with the Apple RAM or are you just running the Samsung Sticks?
Thanks!
For comparison to my 2018 Mini i7…
Cinebench running on a 2020 iMac, 3.8GHz 8 Core i7, Radeon Pro 5500 8GB, 8 GB RAM, 2TB SSD.
iMacBench1 — Core temps a little over 40C with a fan at 1,200RPM under minimal load.
iMacBench2 — Under full load
All 8 cores increase quickly to turbo boost then begin dropping back down
All 8 core temps rise quickly to a little less than 90C
Fan speed stays 1,200RPM
iMacBench3 — Still under full load, task nearing completion.
Package power drops slowly down to 120
All 8 core temps climb slowly and plateau at just under 100C
Fan ramps up to near max 2,700RPM
iMacBench4 — Task complete, cooling down.
Package power drops rapidly as load decreases
Core temps drop fairly quickly
Fan speed drops more slowly
At full load, the fan at 2,700 RPM is audible but not really “loud” unless you listen behind the screen. I’d say the thermal performance of the 2020 iMac 8 core i7 is quite acceptable IFF you use it as a “sprinter” — i.e. long periods of light to medium CPU usage with short periods of heavy load.
GetRealBro
Last edited:
If it eases your mind I've been running my 2013 iMac around 90-100c since 2013 since I constantly have a transcode running in Handbrake and add to the queue once or twice a day. I replaced the thermal paste 1 1/2 ago and to my surprise it wasn't dried out.