Mining any coin with that rasp will never make any profit for you, but if you use it just for staking/minting like OP says it may be make some good profit to you, just pick some good PoS coin outhere and start staking, you can get from 1% to 100% a years.
Edit, just found this
https://steemit.com/cryptocurrency/@andrebarn/list-of-pos-proof-of-stake-coins that article can be some good refference for both of you