I've got an ax1500i running my two, don't know about the 1200 though, it might but you'd be at its limit if so, the 1300 should be OK, but your nearing max. with 2 S5's, test by keeping watch for a couple days.  You can always down clock them a little like I did if the 1200 can't handle it.  I downed mine to 312.5M due to heat.  The 1000 P2 is a great one for a C1 or 2 S3+'s.

I got mine new yesterday and that's how they were new.  Might keep that in mind when your filters start getting dirty fast in there.

Re deltas-it wasn't that deal phil was talking about? because if it was, these fans (I bought a lot of 5) have some weird connector which does not seem to readily fit the 4 male pins on the miner.
Did you try these fans already?

Interesting... Can you give insight on how to wire that correctly?

Strato

Mine came and the connectors are funky shape connectors annoying as shit.

 I will have to splice them to some other pwm plugs.

I will use this to splice

http://www.mcmelectronics.com/product/27-5985

  to some standard pwm

If you look at page 3 of the S5 manual you will see as long as you dont mix PSU's on the same board you can use more than one PSU to power a miner. So you will power  miner #1 with 4 plugs from the first PSU and also plug into both plugs on one side of same board of miner#2. Then use the second PSU to power the other side of miner #2 and to power all 4 plugs on Miner #3. This will give you room to run the miner at a higher freq as at freq 375 my miner draws @635 watts at the wall and get @1220GH.

https://bitmaintech.com/files/download/AntMiner-S5%20user%20guide.pdf

Also from what I have noticed with servers is that noise affects the performance of reading from and writing to the mechanical hard drives (SSD's are obviously unaffected by noise vibration as they have no moving parts). The noisier the environment, the slower they get.

BTW, is anyone able to compare the noise to an S4 please? I have an S4 and had to find another location for it. I had my neighbour knocking on my door asking what the hell the noise was and saying that he could not sleep with it (we both are in separate houses and his bedroom is about 50 meters away from my house). I have seen reports of the S4 between 70 and 90 db but not sure how accurate they were. It would be great if someone could do a test using the same metering device at the same distances for testing both.

Its being fixed.



Just remember no overclocking is 'safe', especially as you lose your safety net of the warranty.

I moved mine to get a little more cold air. The fan slowed enough that the high pitch whine went away, but it was still moving an incredible amount of air considering the ambient.

That's unfortunate since the BBB is essentially off the shelf. It would save a bunch of time if people could just swap the BBB instead of having to send the thing back to Bitmain.