If you go to NOW, you will find upgrade instructions for a head
swap.
Bruce
Indeed. I did a search on Knowledgebase for "upgrade F740 to F840"
and up it came. (I should heave done that first.)
Solution ID: 3.0.6869703.2865011
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Matt Phelps
System Administrator, Computation Facility
Harvard - Smithsonian Center for Astrophysics
mphelps@cfa.harvard.edu, http://cfa-www.harvard.edu/~mphelps