Mac Pro 5,1 and 4,1
- 4,1 dual-processor Mac Pros use special, "lidless" CPUs. You either need to buy lidless CPUs, de-lid them yourself, or pay for de-lidding service, so that the CPUs are the proper height. Failure to do this results in very expensive damage when the heatsink is tightened down. Some people have kept the lids on, but were extremely careful about not tightening down the heat sink too much. Other people have kept the lids on, but added washer stacks (of equivalent height to the lid difference) to where the tightening screws go--this is intended to prevent the heat sink from overtightening and causing damage.
When I discovered that upgrading the processors in my Mac Pro with dual-processor's was a possibility, I was amazed that there was not a lot of resources or complete guide on how to remove the soldered IHS's off the cpu's. So I went about to teach myself how to do this consistently, and have successfully done so many times now without issue.
I have created a video tutorial on how to perform this, from the de-lidding of the IHS and then the fine removal of the solder left on the die.
Clearly, the benefits of removing the IHS outweigh any concerns that someone may have since it's not difficult to do just as long as you prepare yourself with the right tools and take your time doing it.
The tutorial can be viewed here on Youtube:
Thanks.