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1  Bitcoin / Hardware / Re: Silently cooling the Compac F miner, looking for the best fan configuration on: June 12, 2024, 10:01:44 AM
My silent cooling solution pushing the frequency to 510MHz.
I bought these items:
1. https://www.amazon.de/-/en/dp/B09NSDPMRJ (1 x Aluminium Heatsink 300 mm x 25 mm x 10 mm Heatsink Module Cooling Fin for LED Cooling LED Emitter Diodes High Performance Splitter, Heatsink)
2. https://www.amazon.de/dp/B07JQD232W (Akuoly Set of 4 Aluminium Heatsink PC Cooling Fins Cooler Set Heatsink with Thermal Adhesive Tape Cooler Fin for Amplifier Transistor Semiconductor 70 mm x 22 mm x 6 mm Silver).
3. https://www.amazon.de/dp/B00XQ9AZ8Y (EC360 Glue 2W/mK Thermal Adhesive Liquid (10g))

I cut the longer blade in 3 parts for my three CompacF's, used the above glue to extend the heat sink with another 10cm of aluminium heatsink. Then for extra heat dissipation I add the smaller sinks on the back using same adhesive glue


2  Bitcoin / Mining support / Re: Antminer S15 with latest firmware consumes 1900W in lower temp env of 24C on: April 24, 2019, 06:46:04 PM
Just to be clear... my experience is that the S15 indeed consumes 1600W +/- 20W as long as the room temperature is high enough that the PCB temp reads above 27C. If not only then the consumption jumps to 1900W.
3  Bitcoin / Mining support / Re: Antminer S15 with latest firmware consumes 1900W in lower temp env of 24C on: April 24, 2019, 11:33:56 AM
Maybe you are experiencing low temp protection this might be the reason why you are getting unstable hashrate for the first run did you try to run the miner for a longer time? Let it run first for 3 hours and let see if you will get stable hash rate and miner consumption.

Next time don't upgrade the firmware to the latest version if your miner is running fine without any software issue. Bitmain releases new 2019 firmware that mostly fixed all security issue(Disabled SSH access) if you upgrade the miner to 2019 firmware the miner SSH access is disabled where you can modify the config and bypass temp protection.

Jus FYI, I received the unit 2 weeks ago, loaded with the 2018 Dec firmware in which the SSH was already disabled. I upgraded hoping for a fix to the root cause (the ssh vulnerability) and reactivation of the SSH. The hash rate is stable once a certain operational mode is achieved (ie cold or warm env operation.

Now... my main concern here is the increased power consumption to 1900W in colder env (20-24C 68-75F) (which is not that cold anyway and I guess many datacenters keep it even below this):

If I operate the miner in such "colder environment", hoping for a better performance (lower RPM fan) and efficient cooling, it ends up backfiring by jumping the electricity consumption by 300W (at the same hash rate), which at the current BTC price and electricity rate changes the whole economics quite a little. I bought this one miner because of improved efficiency and all that goes down the drain if it's too cold in the room?!? This cold protection seems to defeat the whole purpose of redesigning S15 as a more energy efficient miner.

I'll continue testing when I'll have more time and report back.

Thanks for all the comments.
4  Bitcoin / Mining support / Antminer S15 with latest firmware consumes 1900W in lower temp env of 24C on: April 22, 2019, 11:40:01 AM
Hi guys,

I recently purchased a S15 and I ran several tests since, measuring the power consumption on wall. All seemed fine until 2 days ago when I installed the latest firmware Antminer-S15-user-201902251130-sig.tar.gz
In Finland the outside temp is cool enough to allow my S15 to report a "PCB temp" while running of 23-26-27-23C in the 4 rows and first column of the monitoring screen. The chips temp is in the 60-72C range for all tests.

Here's my test case:

1. I start the miner in a 20-21C room, allow it the time to boot. Initially all seems ok, hash rate 28TH and on wall consumption is 1600Wh.
2. 4 mins after this I see this logs in the kernel log (notice the low_bringup_pcb_temp_threshhold):

Code:
2019-04-22 10:03:48 driver-btm-soc.c:3774:check_system_work: Entering low environment handler...
2019-04-22 10:03:48 driver-btm-soc.c:3775:check_system_work: bring_up_pcb_temp = 25, low_bringup_pcb_temp_threshhold = 27, ideal rate = 28000, AVG_rate = 26838
2019-04-22 10:03:48 driver-btm-soc.c:7929:re_open_core: re_open_core start!
2019-04-22 10:03:50 dspic33ep16gs202.c:572:set_pic_heart_beat: Heartbeat failed on Chain[3], retry_count=1! read_back_data[1] = 0x0, read_back_data[2] = 0x0
2019-04-22 10:03:51 dspic33ep16gs202.c:572:set_pic_heart_beat: Heartbeat failed on Chain[2], retry_count=1! read_back_data[1] = 0xfe, read_back_data[2] = 0xfe

3. The miner consumption drops to some idle 100W for the next few minutes.
4. For the next 5 mins it reinitialises the hash board and finishes with:

Code:
2019-04-22 10:09:07 power.c:198:get_power_voltage_from_iic_value: iic_index for voltage[46] = 19.520524
2019-04-22 10:09:07 power.c:229:set_iic_power_by_iic_data: now setting voltage to : 19.553896
2019-04-22 10:09:08 power.c:198:get_power_voltage_from_iic_value: iic_index for voltage[47] = 19.503839
2019-04-22 10:09:08 power.c:229:set_iic_power_by_iic_data: now setting voltage to : 19.520524
2019-04-22 10:09:09 power.c:439:get_chain_voltage: chain[0], voltage is: 19.24
2019-04-22 10:09:10 power.c:439:get_chain_voltage: chain[1], voltage is: 19.23
2019-04-22 10:09:10 power.c:439:get_chain_voltage: chain[2], voltage is: 19.28
2019-04-22 10:09:11 power.c:439:get_chain_voltage: chain[3], voltage is: 19.24
2019-04-22 10:09:11 power.c:462:get_average_voltage: average  voltage is: 19.25
2019-04-22 10:09:11 driver-btm-soc.c:3794:check_system_work: low environment handler!
2019-04-22 10:09:11 driver-btm-soc.c:3795:check_system_work: low temperature reopen core and increase voltage 1 times!

5. At this point the miner is up again. Hash rate is up to 28TH again but the on wall consumption jumps to 1920W and stays on like that.
6. I bring the unit down and move it deeper inside the house (23-24C) where the temp PCB reads 36-40-38-36C. I power it up again.
7. This time power consumption stay at 1620W and there is no reinit of the hashboards and last lines in the kernel logs read:

Code:
2019-04-22 10:20:19 dspic33ep16gs202.c:65:volt_clamp: failed on Chain[3], b[0] = 254, b[2] = 254!
2019-04-22 10:20:21 dspic33ep16gs202.c:65:volt_clamp: failed on Chain[3], b[0] = 254, b[2] = 254!
2019-04-22 10:50:25 driver-btm-soc.c:3706:check_system_work: The avg rate is  28206 in 30 mins, PCB temperature between 36 ~ 62

Anyone shares the same experience? I didn't notice this on the old firmware. The new firmware mentions one thing that worries me: "Add low temperature protection function". Anyone knows where to pull the old firmware from (ie the December 2018 one)?

Cheers,
Bogdan
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