Yes, Grin is without any form of pre-mine or ICO. So the only way to get is to mine after the mainnet launch. Cause this project is super popular now, solo miner might not get any profit.(To clarify, just my personal guessing after reading through the thread of different chatting groups of Grin.) As for the hardwares , I think you could get better answer in this telegram group @Grinfans. Hope this helps.