Hi can anyone help me i have a psu on 700w and 2x rx 470 xfx 4gig & 1x rx 480 nitro 8gig and i dosen't get it to work when i start the miner my computer hangs and i have to restart it a fast easy guide to undervolt cards or something pls!
Check the PS +12VDC rails - if it's not a single-rail design you might be overloading one of the rails.
If it IS a single-rail design it still might be marginal for the +12VDC draw.
Not all "700w" power supplies are built equally.