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Someone with a 2020 iMac with Radeon pro 5000, test the watts
- Thread starter Kung gu
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It won’t overheat. There is a lot of things heavier than driving a single 1080p external monitor and the iMac doesn’t overheat. It gets hot yes but it’s mostly correct.
See here :https://support.apple.com/en-ca/HT201918
I already told you it won’t be a problem. iMac isn’t a laptop form facotr. Yes it heats but a 1080p external monitor is nothing for a 5500XT. The form factor isn’t prone to just heat like a laptop. The MBP heats more because the GPU is solicited as soon as you plug an external monitor, which is normal because it won’t run on the iGPU and then consumes more power. An iMac *always* run on dGPU so it’s not a problem. There is nothing to worry about.
He's not interested in the iMac overheating, he wants to know if the same issue as in the MBP 2019 still prevails.
@pldelisle No, that's not normal at all. Neither Nvidia nor Intel iGPUs show that behavior.
And even though I've not tested it, I would assume yes because the underlying issue seems not to be firmware nor Apple related but AMD and their memory clocks when attaching external LCDs.
@pldelisle No, that's not normal at all. Neither Nvidia nor Intel iGPUs show that behavior.
And even though I've not tested it, I would assume yes because the underlying issue seems not to be firmware nor Apple related but AMD and their memory clocks when attaching external LCDs.
My old 750M heats a lot more when an external monitor is plugged. And it’s normal. When running only the retina display and running no dGPU dependant applications, the iGPU is sufficient. It’s on the same package as the CPU so it doesn’t heat that much. When external monitor comes in, the dGPU is automatically switched on. The 750M uses something like 35w. This is 35w more to dissipate. It’s basic physics.
It could be that also. Maybe the clock speed cannot be lowered when idling because of a firmware issue.
I was referring to more modern GPUs. More recents ones don't have to up their frequency (neither VRAM nor GPU) in order to drive an external LCD. They can remain in a low power state in that case. Only these Polaris/Navi GPUs for some reason need to run their memory frequency higher and therefore generate more heat.
well switched it to 1080P and the watts are around 47-50 and when in 2560 by 1440 watts is around 52-55
hrmm little odd but in 4k Res its same watts as 1080P maybe less avg
can you test again with no apps open? and at idle?
oh and are u reporting the radeon high side?
what resolution did u set the iMac's display?
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i dont have that i'm going off GPU package watts
Imac is the native scaled 5k to 2560/1440.
i dont see how any of this matters
I have the MBP 16", I have the 5300M and when I plug in my 1080p monitor it the wattage increases to 18w with no apps open. Causing the CPU temps to go up.. Theres a 140 page thread about this in the MacBook Pro fourm.
well that will happen on an imac too. using more of the hardware then not when connecting 2nd monitor so it should run alittle warmer
before I plug in the monitor the watts are 4-5 and when I plug it in its 18watts..