I think he should have new case since the cooler is pretty big . It won't fit normal case , especially OEM case (Well , those Cooler Master cooler ain't small either 
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As long as his old HDD doesn't use IDE but SATA connection , he can reuse it
)As long as his old HDD doesn't use IDE but SATA connection , he can reuse it
Laptop: (Show Spoiler)
Mini PC :: (Show Spoiler)