Looks like second hand S5s sold out. Waiting for some news from Bitmain. 

nope not sold out yet still green here as of this posting.

It did but for some it had other side affects like hashing cut in half. or speed dropping to 900 GH .

It did sold out, when Rabinovich first posted. Now its green again but it appear to be a different batch (of batch 7). The previous one said august 5, this one says "Shipping starts from August 14th after receiving full payment". This is probably why QuintLeo find it slow on shipping.


That sound troublesome. These second hands are from Batch 7, it makes me wonder what bugs i'm going to get. =/

Antpool hashrate is back to what it was before, let's see if it continues upwards from here.

I see, they work well performance wise? I am supposed to received mine tomorrow. For some reason, having to pay import tax for UPS is an "unexpected issue" and that delayed it to tomorrow or something. Well whatever.

I might try your pull the pin trick to get 100% fan at all time, maybe not, the melting issue is supposed to have been fixed and there's manual user control fan firmware out now. I will of course test that and also cut its internet to see how it reacts.

If i can keep the fan speed dialed down just a bit and it doesnt wind down when it lose connection, i might go for it.

Both  of these "used" S5s are running a bit odd - the "bottom of status screen" hash board runs 6-8 degrees cooler than the other of the same unit or than any of the other hash boards in ANY of my S5s when running at the same clock speed, the "top" board is kinda mid-range on temp compared to the boards in all my other S5s.
 Temps are running about the same on the S5 with the straight-blade heatsinks and the one with the older-style curved ones and they're both meeting specs easily though, once I got a couple configuration quibbles fixed (MY glitches, not theirs).


 I got a call from FEDEX the day after they shipped about some sort of customs issue, but they apparently resolved it before I noticed the call - by the time I noticed I HAD a voicemail about the issue asking me to call them back, tracking on their web site showed that the units were already in Indianapolis (I think they have a major hub there, for similar reasons to why UPS put THEIR primary air shipping hub at Weir Cook Indianapolis International a couple decades back).

Actually temp board are sometime different because of the temp sensor. The temp sensor is in the middle of the board and is not really accurate.
You can also repaste the thermal paste of the chip to drop the temp of the chip.
These chip are bottom heat so even if you but heatsink on top of it you will not see a big difference in temp. 

Might have that the wrong way around - these are, or are at least claimed to be, flip chip type designs with most of the heat going out the top of the chip.  The S5 miner design has heat sinks on the top.  Maybe you were referring to board sides, though.

I'm also not convinced that cooling the other side is entirely fruitless - just not necessary - as some heat is going there as well (can't disobey the laws of physics).  The S5's layout does mean that if one were to put heat sinks there, they'd either have to be small, or would require spacers to get the clearance above the taller passives.  My Compac's running a wee bit cooler with its shiny new heatsink on that side - but unlikely to be worth the bother on a large board vs getting better airflow.