3x 280X
GPU1 360kH
GPU2 360kH
GPU3 20kH WHY ??
Lack of system RAM.. scrypt-n is a bitch.
8GB RAM
Yup.. for 3 cards you'll need 12GB.. 4GB per card.
Not at all, I'm running six on a H61 Pro BTC motherboard and 8GB of RAM at 6x370KH/s.
Sometime when relaunching the miner after changing settings a card or two does get very low hash rate in the 5-30KH range, a reboot solves it.