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I have an old laptop that I need to get a new power supply for, and it seems the only one I can find with the proper connector is 90W, rather than the 65W the original had.

Would it be safe to use the higher wattage? (The laptop is a Dell Inspiron 8600)

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As a rule of thumb, it generally should be safe, but I can't guarantee that for this particular machine so I'm not making this an answer. –  Shinrai Nov 16 '10 at 15:53
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2 Answers

up vote 4 down vote accepted

Presuming connectors, voltage etc are the same the wattage increase won't be a problem at all.
From: http://ask-leo.com/is_it_safe_to_install_a_higher_wattage_power_supply_in_my_computer.html


It's better to have too much power than too little

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The external power-supply "brick" can be a higher wattage but the voltage must match within a few percent. The laptop power connector polarity must be correct too. It should ideally be a properly regulated switched-mode power-supply designed either for that model or similar.

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