Yeah that's not a good roi. Underclock and under volt a set of 6 used r9 290x. Mem clock to 1160 and you'll be at aboit 1100w. Mine eth and lbry. Sell your coin and buy zcash if in the end you want zcash. You'll spend about 2100 on the cards. Profit should be about 400 a month, double what you have priced. Take that extra cash and buy a steak every week while you sit back and smile at you acct value
I am not a fan of the topic starter's idea of building such a rig, but buying 3+ years old that have been mining at 300W and 90 degrees C is not any better.
Not to mention that lbry now belongs to asic's territory, you won't make more than 10 cents per card per day - dual mining is not that worth it anymore.
NAAAAAAH, you must not know much about electronics. if they have ran 3 years they are good, probably wont die, just do semi annual maintenance replacing thermal compound and cleaning the card every week to save the fans. BUT thats not even what I was saying.
buy cards that have been used for gaming. there isnt a shortage on ebay and you can tell if they used it for mining when you receive it. Ive sent two back, but then i just started using them even if they were mined on. The fans are the only thing that go bad usually. AND a dead card is worth 100 bucks resale.
I stick to my position.
Oh and 300w is ridiculous when you undervolt and underclock. As for dual mining it works great. recent updates have almost no effect on eth hashrate. I checked my lbc payments and there is a negligible power difference on r9's running dual, and the future of the coin is good, hold, dont dump. yeah it wont compete with asics, but its something on the side.
also what asic is doing lbc? holy crap i knew obelisk has a DCR miner and i have a couple SC miners..but lbc too? or is that the same algo?