dumpstered about 25 ATI Radeon HD4550

ei team. i've been thinking about setting up a rig for a while and checked out some rigs for about 500 usd (obviously w/o gpu's). some of them have 13 slots for gpus and then i found a butt load of old ones. i'm in the north and have some solar panels so i was thinking about setting something up for this winter. i'm not really sure if it would be worth it to mine kawkaw with these old gpu's but if they were working in series maybe. in any event, if anyone has any thoughts about this, let me know. because i'm not even sure if these gpus would be compatible with a rig.