You need good timing straps to reach 1k+ on CN-V7. 8gb cards can do 1k+ on CN-Heavy easily.
I have also got 1260 H/s on an RX 570 8gb card (1466/2300 clocks). They do 1140 H/s @ 1250/2240 clocks and 900mV core (105w from wall). So it's pretty much possible.
Also, All 4gb cards that I have Elpida, Hynix do 1k+ on CN-V7.
I want to see that...
Can't get more that 700h/s with Elpida 570 pulse 4gb (with stak and SRB)
6 x RX580 4gb cards + 1 RX570 8gb (GPU4).
