Ok, I was just about to start a thread on a similar, topic but this one is close enough so I'll temporarily hijack if that's OK
My bros Corsair PSU died earlier in the week (also a 620 funnily enough), it's still in warranty but he has no invoice anymore.
Do you need proof of purchase to RMA or just the serial number on the unit?
You dont need either, just enter the date of when you purchased it with a description of whats wrong with it and they should reply with "Approved or "Denied" etc.


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