Re: Bitmain's Released Antminer S9, World's First 16nm Miner Ready to Order

at 1275watts is it now ok to use something like a EVGA Gold G2 1300watt?
Been Eyeballing 1600watts ones but 1300 is liek 150$ cheaper Wink

you'd be pushing it pretty hard.

easy solution is to underclock the S9 slightly, such as to 13TH - which would reduce your PSU load by 100W

Under clock a bit more to 11.5th. The 1300 g2 will work fine..

Then figure your math. You save 150 on the psu. But lose 2000gh to 2500th.

At current diff that's about $3 per day before power costs. So probably 100+ days ROI on that difference alone... I'd say if one already has a 1300W PSU they should probably underclock. If buying new - I'd buy a server PSU anyway.

well the 1300 only has 6 atx connectors so lame.

first of all, eight (four singles and two doubles=8); second, I bought two PCIe split cables (for $4 ea) that increase total numbers of connectors to 10. has been running many B1-5 and 6 like this for 6-8 mo already on EVGA 1300. S7 b1,3,5 has similar 1293 wattage, B2,4,6 even less watts.
EDIT: exactly what @suchmoon said as well ^^^^

where did you get the PCIe split cables. I just want to make sure I get same gauge wire as you! random amazons are bad choices! I did that for my S3's and got like thinner than 22 gauge or something. almost fried them. rewired them with 18 gauge.
so using a 1300watt GOLD how much under clocking? like a 4.7 S7 needs to run at work? 4.5? or something worse?
thanks

@bspurloc I get Jacobs parts-they have 18gauge, work fine
https://www.amazon.com/gp/product/B00JLU0UQ4
S9 B2 can run on EVGA 1300 as is since it's power usage is almost the same as original S7 B1.
As far as undercloclocking S7 batches above 8, I would say that 650 or even 675 should be OK, but i would start with 650.
B6 is exactly the same as above B8, but runs on 600 and uses only 1042W; B8-18 runs at 700, which is 1293W (1390-1400W at the wall).
Fro this, I assume that 650 would be around 1167 (1228 at the wall) and 675 would be 1230W (1300W at the wall). EVGA 1300 can handle 1360W at the wall just fine.