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Two issues.
One as mentioned these boards have some pretty crazy thermal mass so most irons you would competently repair them with are not powerful enough or will not stay above the melting point long enough to melt the joint.
The other is lead-free solder requires significantly higher temperatures to work with.
When I recap modern motherboards I'm forced to use a Weller ETDD tip with the station cranked to max. It's really hard on the tools and tips.
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