Does the power supply matter? I have a Gridseed 5-chip ASIC miner and am running 2 amps into it. Will this impact how it works and if it works at all if I use 2 amps instead of 5?
Yes. If you use a 12V/2A power supply rather than a 12V/5A supply, the voltage will drop, causing hardware errors. You will effectively be undervolting the chips.