i have updated my review of the S5.
it can be read here:
http://rgsneddon.thescribe.eu/#post117
It now seems to me, evident why the S5 is an open unit.
It is my presumption that due to the string design, the S5 struggles to cool properly.
updated synopsis...
Q. would i recommend this miner?
A. I would recommend this miner only if the price is relative to a hashrate of 750GH/s
ADD: I would not run this unit at stock settings in my home - there is something about those plastic sides which make me a little apprehensive and feel this the S5 is only a few degrees away from giving out flames.
ADD 2: all three of my SP20's (underclocked) were at 30degrees in and 57degrees out this morning. I have no fear about the safety of these.
ADD3: my SP31 was also perfectly fine temperature-wise and this is not an underclocked unit
not sure i would agree. The temperatures on my unit are just fine, and Im not really concerned at all with the heat of the unit. I run the fan on 5V and aim to have the board temperatures averaging around 60C. With a nearby window cracked slightly an intake of 5C allows me to overclock to 381.25MHz/1255GH without tripping my 612.5W PSU rail (fan is on a 5V rail so that frees up 12W+ for mining). With room-temperature (~20C) intake I have to operate at or slightly under the stock 350MHz.it can be read here:
http://rgsneddon.thescribe.eu/#post117
It now seems to me, evident why the S5 is an open unit.
It is my presumption that due to the string design, the S5 struggles to cool properly.
Quote
Update 01 January 2015
I have decided to downclock the S5 on account of my discomfort in the temperature of the unit. It is located away from my home in a garage and whereas in the daytime, I am able to leave the garage door open, I cannot do this at night.
The reason I am uncomfortable with the temperature is that when I checked in on the miner remotely this morning, temps had gotten to 80+ degrees - although the miner was still hashing at advertised rate, I was glad to be able to have the door opened. Tonight I have underclocked the unit to a frequency of 218.75 and it's doing ~750GH/s with temps at or around 50 degrees celcius. I do not have a meter to allow me to measure the wattage but will presume it's being quite efficient and also will stay at a sensible temperature overnight in a closed space.
I have decided to downclock the S5 on account of my discomfort in the temperature of the unit. It is located away from my home in a garage and whereas in the daytime, I am able to leave the garage door open, I cannot do this at night.
The reason I am uncomfortable with the temperature is that when I checked in on the miner remotely this morning, temps had gotten to 80+ degrees - although the miner was still hashing at advertised rate, I was glad to be able to have the door opened. Tonight I have underclocked the unit to a frequency of 218.75 and it's doing ~750GH/s with temps at or around 50 degrees celcius. I do not have a meter to allow me to measure the wattage but will presume it's being quite efficient and also will stay at a sensible temperature overnight in a closed space.
updated synopsis...
Q. would i recommend this miner?
A. I would recommend this miner only if the price is relative to a hashrate of 750GH/s
ADD: I would not run this unit at stock settings in my home - there is something about those plastic sides which make me a little apprehensive and feel this the S5 is only a few degrees away from giving out flames.
ADD 2: all three of my SP20's (underclocked) were at 30degrees in and 57degrees out this morning. I have no fear about the safety of these.
ADD3: my SP31 was also perfectly fine temperature-wise and this is not an underclocked unit
The plastic sides would likely not deform until a minimum of 100C, and actual melting temp has to be well over 150C, or the temperature that the antminer shuts itself off or would otherwise be failing massively (which nobody has experienced yet).
keep in mind that the SP20 temperature is more air temperature than the board. Asic stats show that the chips are 85C underclocked or up to 125C in normal operation. Antminer chips go into the 75-95C range I believe, and the sensors on it are likely in contact with the hot side of the heatsink. 55-60C is an ideal temperature for the S5, above 65C may spell trouble
that said, 80C is very high, is your garage warm? I found that if you put a cover on the unit air crosses the heatsink instead of blowing out the top around the beaglebone.
Anyone else had this?
