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I did a complete update a while back with SSS Progman. It took all night and my 50 amp Astron kept up (pegged the meter when I first hooked it up but settled down to about 30-40 amps) so you should be good with 50 amp or better. If you can, go with the recommended 70-80 amp though; Astrons are pretty much bullet-proof and could handle being pegged at 50 for a few minutes until it settled down. I don't know about some of the cheap switching PS's.
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