I too have an i7-5820K system with a GTX970 in it. I think I would be inclined to wait for the GTX1070 to come out before buying a new system; I don't think the Broadwell-E is much more exciting than the Haswell-E.
I also have a couple of bare-bones Haswell systems (an i7-4770 and an i7-4790K) which do sieving reasonably quickly.
Last fiddled with by fivemack on 2016-06-01 at 22:37
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