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.
having same probs here. my r9 270x just gets hillarious 20kh/s. rebooting didn't solve it
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Re: [PRE][ANN][QB]QuarkBar - Quark based | POW | KGW | CPU Mining | Zero premine