Longer answer is your 740 DT (SFF is the other smaller size) should already have a 280w PSU. The Optiplex XE SFF came with a 280w PSU, and sometimes people with lesser 235w PSU's use the XE PSU to upgrade. Videos are on YouTube. That's the only known exception. Much easier to do upgrades on MT's.
speedstep
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March 16th, 2019 17:00
No.
bradthetechnut
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March 16th, 2019 18:00
Longer answer is your 740 DT (SFF is the other smaller size) should already have a 280w PSU. The Optiplex XE SFF came with a 280w PSU, and sometimes people with lesser 235w PSU's use the XE PSU to upgrade. Videos are on YouTube. That's the only known exception. Much easier to do upgrades on MT's.
https://www.dell.com/community/Desktops-General-Read-Only/Dell-Optiplex-740/td-p/4113981
YouTube Optiplex XE PSU Fit...
bradthetechnut
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March 16th, 2019 18:00
True.