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Quote from: bspurloc on June 10, 2016, 04:39:18 PM

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.

thanks for the info. what hashing rate would 675 get?
sorry for dumb question. I am just jumping up to s7/s9's.

S7 with batch number at or above 8 should be about 4.56th at 675 vs 4.73th at 700 (theoretically).
S9 batch 2 (not b1) should run fine on EVGA 1300 with two splitters.