Mac pro upgrade cpu7/3/2023 ![]() The firmware upgrade to a 5,1 is very simple and required to use Westmere processors. De-lidded CPUs cost quite a bit more and are not worth it IMHO, or worth the risk of de-lidding them yourself. I used lidded CPUs and did the 'washer stack' method mentioned on the site to upgrade my 4,1 with few problems following the guide on how to tighten down the heat sinks. Drop me a line if you are having problems finding a particular guide and I will see what I can dig up and upgrade the answer here if relevant. Double check everything and ask questions(I recommend the same site again) if you are unsure about something. I spent a lot of time making sure I had it all clear in my head before buying the processors and starting the job. Read everything through before starting and you should be fine. This post at the macrumors forum lists which CPUs are capatible, outlines the various issues with upgrading, and has links to detailed guides on the upgrade process, including the firmware upgrade.
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