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?
Using a 12V 2A supply will be OK in scrypt only mode. I am using a 12V 1A for a gridseed in scrypt only mode. If you remove the fan @850Hz you can get the power usage down to 6W, other wise it is 8W. 12V x 2A gives maximum of 24W power available so loads of overhead.
CCTV 12V DC power splits are available for a few $/£ which can power multiple gridseeds if you have a 12V 5A supply. I am powering 4 from a 12V 5A supply with fans removed.
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.