[FS] Undervolted S7s, 3.7-4TH 870-1050W (~0.24J/GH) with PSUs

[sidehack]

I probably can ship to the UK, yeah. I haven't done a lot of international shipping so I'm not sure what different carriers require for paperwork; the easiest thing for me is to be provided a label (I have ready access to UPS, FedEx and DHL) but not everyone has an account to do that. We can discuss details in a PM.

These units aren't as quiet, but they are more efficient than a stock S7LN. The two I just added (63 & 64) are both running pretty good in 85-100F ambient on 30% fan speed so in a cool room they could go lower. For minimum-threshold-voltage boards, running hot seems to help with stability. Everything not marked as "sold" is still up for grabs.

[udaredme]

Perfect I'll happily purchase one Thursday when payday hits. With wife approval of course haha.

[sidehack]

If they haven't sold by then. I'm not sure when I'll be getting more to work up.

[ohh_canada]

I'll take one if you still have.
How much for shipping to Canada (toronto)?

[sidehack]

I still have two of 'em, take your pick.

As for shipping, I'll have to get back to you. I tend to use FedEx for packages but I've had no luck with not getting screwed on sending FedEx packages to Canada. Any way you could send a label for pretty much any major service?

[aarons6]

the S7 i bought from sidehack is working good on kanos pool.. i had to lower it down to 575 because i was getting x's in chain 1..

its right at .25j/ghs and i put on AFB1212-SHE fans so its pretty quiet, specially at night when it gets cooler.. i have them set to automatic so its about 3400 rpm daytime and about 3100 night.
i tried one stock fan with the 1-fan rom, but that rom just makes that fan run at full speed on auto.. it gets too cold at night and shuts off..

i wish i can set the fan curve manually. not just the fan speed.. but the whole curve.. at night i can run the fans down to about 2400 rpm and still be ok, but daytime i need higher.

the trick is to keep the boards above 55c.. if they run too cold, it just goes idle. 0 hashing and 23c.

another strange thing about that s7 is the light blinks red instead of green. not sure what its trying to tell me. anyone know what the light colors are for?


i ordered a pickit3 and im waiting for it to come in so i can do my other s7.

[DaveF]

1) The LN that I got from you is working great.

2) This might be a stupid question but.... I have a few of your Dell 750W power supply boards. If I get the last S7 from you would I be better off running 2 boards on 1 supply and the 3rd board and the controller on another or would it be better to link them together this way http://www.gekkoscience.com/products/D750_3way.html?

-Dave

[sidehack]

It'll be more reliable to run the two supplies tied together. One concern with a two-supply setup is the fan/controller PSU dropping out and the two other boards idling with no airflow can cause problems.

[sidehack]

As of right now, all my undervolted miners are spoken for. I'll bring this back up if I get more.