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I read from some threads mentioning about the thermal control thing on old iMacs. Especially when replacing the hhd, we have to buy a thermal control sensor from OWC. im not sure if we still it for the iMac 2019. Because I’m planning to upgrade the ssd on my own. can someone help? Thx a lot

I doubt any of us have done an upgrade on a 2019. Why not get it from iFixit, try it, let us know your results. If you don’t need it, return it. UPDATE 9/5/19 OWC is still showing the thermal sensors on the models with standard hard drives: https://eshop.macsales.com/upgrades/imac

Dear Taiyuento I planned to do the same and came across the info on the thermal sensor cable. Are there any crazy fan noise, I mean high spinning noise, after your upgrade ? Daniel from Hong Kong

Hi there, +1 can you please confirm that it is workis fine in terms of fan speed for you?