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Message: <blockquote data-quote="pm-r" data-source="post: 1935199" data-attributes="member: 175845">Those temperatures under load still seem to be well within spec and as Nick said in a previous post, has others on the internet have also mentioned, your iMac Pro 5,1 Ram did not and does not normally use heat sinks on the RAM modules:[URL unfurl="true"]https://www.mac-forums.com/threads/heat-spreaders-cmp-5-1-yes-or-no.371567/[/URL]So why bother creating extra work or expense in the mess of thermal paste Etc that may actually hinder heat build-up if not applied properly.I would say you are good to go the way you are without any heat sinks or spreaders on your existing memory modules. And keep Macs Fan Control fan speeds set properly as you seem to have done already.- Patrick=======</blockquote>