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miretogo

macrumors regular
Original poster
Aug 19, 2014
137
133
Do we have any indication if the cooling in the new 2020 27" iMac has been improved compared to the 2019 model?

Do we have any indication if the cooling in the new 2020 27" iMac will be sufficient to cool the highest-end configuration (without it overheating or becoming incredibly loud)?

I plan to order the 8 core i7 (instead of the 10 core i) but am still unsure whether I should order it with the RX 5700 or the RX 5700 XT because of the cooling uncertainties. I once had a high-end 2015 iMac that reached absurd 107 °C during gaming despite manual fan control on full throttle and don't want that experience again.
 

LiE_

macrumors 68000
Mar 23, 2013
1,698
5,438
UK
Will probably need to wait for the reviews and tear downs to check cooling and fan noise.
 
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CWallace

macrumors G5
Aug 17, 2007
12,202
10,967
Seattle, WA
It does not sound like Apple made any substantial changes to the cooling system and the iMac does have a custom i9-10910 CPU that runs a bit slower at base and boost (by about 100Hz) which would imply it runs cooler to fit better in the existing cooling system, which is designed for 95W TDP chips while the top-end i9-10900K is a 125W TDP part.
 

Nismo73

macrumors 65816
Jan 4, 2013
1,169
1,000
It doesn‘t have the slot in the back like the Pro, but still don‘t know for sure if cooling has changed.
41B77E9B-183F-4DCC-9278-EBD2B6E7B981.jpeg
 

dapa0s

macrumors 6502a
Jan 2, 2019
522
1,033
Considering that the design hasn't changed, I really doubt it. We will find out soon enough (tomorrow).
 
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Mr. Warbles

macrumors member
Jun 5, 2020
75
68
The cooling issue is the only thing keeping me from deciding on this new 10 core iMac or splurging on a 10 core iMac Pro. I need this to run cool with no fan noise. I’m in Audio production.
 

Homy

macrumors 68020
Jan 14, 2006
2,219
2,088
Sweden
while true there isnt a fusion drive in there anymore so maybe used that extra space for better cooling
But since you can order Fusion Drive the space can not be occupied with new cooling so I don't think they've changed much. On the other hand I wonder how they cool Radeon 5700XT and i9 unless they have underclocked both a lot.
 

Whiteman007

macrumors regular
Dec 21, 2008
179
61
But since you can order Fusion Drive the space can not be occupied with new cooling so I don't think they've changed much. On the other hand I wonder how they cool Radeon 5700XT and i9 unless they have underclocked both a lot.

you cant order a fusion drive on any of the 27 inch models just checked
 
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miretogo

macrumors regular
Original poster
Aug 19, 2014
137
133
Arguments for the existence of better cooling in 2020 iMacs:
* The absence of Fusion Drive brings extra space to work with
* Lower noise compared to 2019 model according to Apple (13 vs. 16 dB): https://support.apple.com/kb/SP821?viewlocale=en_US&locale=en_US
* quite powerful CPU & GPU, especially the i9 and the RX 5700 XT

Arguments againts
* No iMac redesign & no vets on the rear like on the iMac Pro
* Apple's often careless negligence of cooling
 

miretogo

macrumors regular
Original poster
Aug 19, 2014
137
133
There's a new report that the SSD on the 2020 iMac is soldered to the mainboard. While I dislike that, it means more space that Apple maybe uses for better cooling. We'll find out soon.
 

Martius

macrumors 6502a
Jul 12, 2008
544
1,720
Prague, CZ
I actually think it's quite possible they redesigned the internals to allow better airflow. Maybe a bigger fan, different motherboard layout... who knows. It would be stupid to not use the extra space left after Fusion Drive.

Hope iFixit will do a teardown soon.
 
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wave84

macrumors member
Sep 11, 2014
76
182
So far, this seems to be the only review of a superior version (10 core, 5700XT) that actually has benchmarks and useful information. Unfortunately, it's in German, and I didn't understand too much. But the takeaway is that the CPU seems to be better than the one in the iMac Pro, and the 5700 XT also scores higher than the Vega 64.



Tally Ho also has some thermal and noise observations regarding the base version:

 
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Homy

macrumors 68020
Jan 14, 2006
2,219
2,088
Sweden
So far, this seems to be the only review of a superior version (10 core, 5700XT) that actually has benchmarks and useful information. Unfortunately, it's in German, and I didn't understand too much. But the takeaway is that the CPU seems to be better than the one in the iMac Pro, and the 5700 XT also scores higher than the Vega 64.



Tally Ho also has some thermal and noise observations regarding the base version:

Try auto translate and choose english! :)
 

ondert

macrumors 6502a
Aug 11, 2017
691
997
Canada
Isn't here any review yet to show iStatMenus or MacsFanControl? So, we can at least see if the iMac still has one fan or more?

btw, just watched the German video and around 7500 score on 3dmark time spy is low. Normal 5700xt gets over 9000 score. That 5700xt should be heavily down clocked and I doubt the cooling system has changed. Just as I expected from Tim Apple. Gross..
 
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Roxy.music

macrumors 6502a
Jun 9, 2019
858
90
uk
I like this guy videos
are you going to buy one? or will you wait tell the Apple silicon new design models are here.? And it has the 10.80 webcam :)
 

Roxy.music

macrumors 6502a
Jun 9, 2019
858
90
uk
Isn't here any review yet to show iStatMenus or MacsFanControl? So, we can at least see if the iMac still has one fan or more?
Hows your other halfs Thunderbolt 3 drive going? i am not sure how long it will take for me to get it here in the UK?
 
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ondert

macrumors 6502a
Aug 11, 2017
691
997
Canada
Hows your other halfs Thunderbolt 3 drive going? i am not sure how long it will take for me to get it here in the UK?

You're asking for the jeyi tb3 drives right? Still rock solid. No restarts or any issues. My wife's iMac is in sleep mode always when not in use, it works without any problem also.
 

timerickson

macrumors regular
Jan 23, 2019
127
118
Isn't here any review yet to show iStatMenus or MacsFanControl? So, we can at least see if the iMac still has one fan or more?

iStat Menus needs to code support for the new models, and their fans and sensors, they don't automagically see them. This likely won't be a source of truth for fan count or other details
 
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