Having owned the iMac 5k maxed out i7 cpu and radeon GFX I can tell you heat is an issue when you push it, even the new iMac Pro's people have reported heat up issues. a work horse they were not designed for, casual work and the odd home project they can work well. and the yellowing of the bottom of the screen is well reported, and if it doesn't happen under apple care after that its an expensive repair, with a Mac Pro you can buy another screen a lot cheaper.
As for the Mac Pro, can you drop an RX580 8G Gfx card in, or Vega with a few Mods? the iMac you can't just upgrade a few years down the line like a Mac Pro 5.1 yes the iMac has T bolt and you can use external GFX cards but this guy has 2k to spend not 4k+ if his budget was no limit then an iMac Pro maxed out with external Vega GFX would be a recommendation to consider. all in all the Mac Pro 5.1 has some upgrade paths to include Nvme drives if you want with some help from forum members here with boot rom's. I expect the new Mac Pro 7.1 will out perform them all, but at what price? 7k plus or a lot more.
Mac Pro 5.1
duel 3.46g CPU's
48G ram to 196G
GX580 8g GFX
Pcie angel wings PC1
500G Nvme drive
USB 3 card if needed.
and can be had for under 2k to me this offers the best bang for buck! but if an all in one is what's required then an iMac to the highest spec you can get for 2k is the way forward.
Well, when you say overheating, it means the system either shuts down or the CPU starts to severely throttle, where performance would be impacted because the CPU, fans, cannot keep up. I don't see it happening in an iMac, TBH.
I know there are concerns of iMac running hot, but, from my perusing of such cases in this forum, it just seems like people are concerned that the iMac is getting hot. But, to me, it isn't the same as overheating as you stated. Overheating would mean the system shutting down and/or the load is too high for the fans to keep up. And/or the iMac is in a less ideal ambient temperature environment causing the fans to not properly keep the machine in a safe and normal operating temperatures...
PS... in your prior post you used the word "overheating issues to iMacs" and in this post you use a less severe description of "heat is an issue..."
PSS... heat is an issue to any computers, be it an iMac or a cMP 5,1... it is just that with an iMac, the "heat" source is closer to you since the machine is inside the screen, as well. Like, a laptop, you can feel the heat of the machine as you use it extensively. In a cMP 5,1, where it is a tower, the "heat" source is not as close to the user as an iMac... I don't even know why I need to explain this...
PSSS... as for yellowing of the screen, I am not 100% on this, but I think LED backlights has made yellowing of the screen over time in years less severe or less of a concern than prior backlighting tech such as CCFL, which my mid-2007 20" iMac uses and my iMac's screen has over years yellowed a tiny bit.... The yellowing in current iMacs might just be defects where the user notices it on day one and can return it. And, IMO, if a screen is perfect on day one, I wouldn't worry of it yellowing over time because you're then worried about something that might or might not happen...
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