Identifying fake fets and genuine ones

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Here is a short video that describe how to identify fake mosfets with genuine ones.
Recently I was experimenting with a SMPS and decided to buy some cheap fets from the internet. I do not remember exactly if it was from E-Bay or Aliexpress but however when I tried these IRF740 they where giving up at around 1/3 of the specified load they should handle.

The video link shows a simple test that I made and shows what to look for.
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