using a psu on a rig

[thresher]

1. Could I attach an antmier to a psu on a scrpyt rig?  For example, could I run one 270 or 280 on a rig and run the antminer off the same 900w psu.
2. Could I do this paper clip trick to a psu, not have to buy a psu connector thing, directly plug that psu into a gpu, and then run it on an established rig?  (The rig is powered normally with its psu, but there is an independent psu powering another card.)
Thanks.