So I purchase and Sp20 Jackson back in October and have been trying to get this thing to run and I am having alot of trouble understanding how the voltages break down when setting this miner. Any ways I have 2 Corsair CX750's. Each are 744 Watts, 12 Volts, 62 Amps. I am trying to find out what settings i should put this miner at so that it can remain stable. I really think I am doing my math wrong when it comes to figuring out what my Watts vs Voltage settings should be. Any help or pointing me to some good reference material would be greatly appreciated.
you are already at the right place.
I don't have links ready since I sold my SP20E, but there are pages and pages of settings on this very thread.
1. don't think about it as a calculation, but more like tweaking.
2. when tweaking, it is better to change just one parameter at the time, otherwise you would not know what cause the resulting hashing change
3. here were my settings (to do this, click on
advanced settings button):
Fan speed: 20 (you could try 10 if your ambient is 72-75F or lower, mine was 80-83F)
Start volts unit 1: 0.642
unit2: 0.642
unit3: 0.642
unit4: 0.642
Voltage limit: 0.647
max PSU Power unit 1: 165
unit 2: 153 <-you see, this was specific to my machine only because at higher power this unit was overheating (you can try setting all at 165 initially)
unit 3: 165
unit 4: 165
restart miner if rate is below :500
mining rate with these setting was 1222 Gh with 650-660W, which is close to most efficient , at least for my machine.
after miner reaches steady state, you need to check
ASIC stats page and make sure that none of the chips have temperatures more than 115C (it does not matter within 85-115 range, anything there is good) and it is also better if mhz ratings are in white, not yellow, but yellow is acceptable (although with yellow there is a small drop in efficiency).
I also suggest to dust-off the insides, but ONLY using compressed air DUST OFF. This improved some chips behavior in my machine after few months of usage. If your miner is used, you cannot be sure how well it was treated beforehand.
I am still reading through the forum to try and understand it better, but my main issue is since my psu's can only push 62amps each total. When setting the voltage should I divide the amps by 4 so that each proc is 15.5 amps. lol I am not an electrician so this is new territory for me.
If you connected both, then you have plenty of power, don't worry about 62amp (which is basically 750w/12v).
The max power usage for this machine (SP20) is 1200w anyway, so 600w/each of your PSUs, which is 50A. you have plenty of reserves.
However, i don't rec running SP20 at default since it is uneconomical
With settings as above I was running on just one Corsair CX 750, but you have to start with two FIRST to make the underclocking settings.
This is what worries me.
System Recovery log
15/11 16:56:00:Testing LOOPs done = ret=8
15/11 16:56:01:Testing LOOPs (verbose=0)
15/11 16:56:08:dc2dc i2c error ASIC:0
15/11 16:56:16:dc2dc i2c error ASIC:1
15/11 16:56:23:dc2dc i2c error ASIC:2
15/11 16:56:30:dc2dc i2c error ASIC:3
15/11 16:56:37:dc2dc i2c error ASIC:4
15/11 16:56:44:dc2dc i2c error ASIC:5
15/11 16:56:51:dc2dc i2c error ASIC:6
15/11 16:56:58:dc2dc i2c error ASIC:7
15/11 16:56:58:Testing LOOPs done = ret=8
Watchdog caught problem: soft handle
spond-manager stop
Stopping MG
Asic Stats
2.6.1
Uptime:146 | FPGA ver:100 | BIST in 20
-----BOARD-0-----
PSU[UNKNOWN]: 0->(152w/152w)[152 152 135] (->152w[152 152 135]) (lim=165) 0c 270GH cooling:0/0x0
-----BOARD-1-----
PSU[UNKNOWN]: 0->(154w/154w)[54 154 137] (->154w[54 154 137]) (lim=165) 0c 275GH cooling:0/0x0
-----BOARD-2-----
PSU[UNKNOWN]: 0->(147w/147w)[52 147 130] (->147w[52 147 130]) (lim=165) 0c 262GH cooling:0/0x0
-----BOARD-3-----
PSU[UNKNOWN]: 0->(145w/145w)[51 145 128] (->145w[51 145 128]) (lim=165) 0c 258GH cooling:0/0x0
LOOP[0] ON TO:0 (w:6)
0: DC2DC/1/:[vlt1:636 vlt2:637(DCl:794 Tl:794 Ul:645) 19W 30A 26c] ASIC:[ 85c (125c) 670hz(BL: 670) 2 (E:192) F:0 L:0]
1: DC2DC/1/:[vlt1:0 vlt2:637(DCl:794 Tl:794 Ul:645) 61W 92A 30c] ASIC:[ 85c (125c) 710hz(BL: 710) 4 (E:192) F:0 L:0]
LOOP[1] ON TO:0 (w:2)
2: DC2DC/1/:[vlt1:0 vlt2:637(DCl:794 Tl:794 Ul:645) 19W 29A 30c] ASIC:[ 85c (125c) 670hz(BL: 670) 2 (E:193) F:0 L:0]
3: DC2DC/1/:[vlt1:0 vlt2:637(DCl:794 Tl:794 Ul:645) 21W 33A 30c] ASIC:[ 85c (125c) 720hz(BL: 720) 0 (E:193) F:0 L:0]
LOOP[2] ON TO:0 (w:7)
4: DC2DC/1/:[vlt1:636 vlt2:637(DCl:794 Tl:794 Ul:645) 19W 30A 21c] ASIC:[ 85c (125c) 660hz(BL: 660) 3 (E:193) F:0 L:0]
5: DC2DC/1/:[vlt1:0 vlt2:637(DCl:794 Tl:794 Ul:645) 19W 30A 28c] ASIC:[ 85c (125c) 660hz(BL: 660) 4 (E:193) F:0 L:0]
LOOP[3] ON TO:0 (w:2)
6: DC2DC/1/:[vlt1:0 vlt2:637(DCl:794 Tl:794 Ul:645) 19W 30A 28c] ASIC:[ 85c (125c) 680hz(BL: 680) 1 (E:193) F:0 L:0]
7: DC2DC/1/:[vlt1:0 vlt2:637(DCl:794 Tl:794 Ul:645) 18W 29A 28c] ASIC:[ 85c (125c) 640hz(BL: 640) 1 (E:193) F:0 L:0]
[H:HW:1044Gh (500),W:198,L:0,A:8,MMtmp:0 TMP:(19/19)=>=>=>(23/23 , 22/22)]
Pushed 18 jobs , in HW queue 4 jobs (sw:0, hw:0)!
min:39 wins:17[this/last min:17/0] bist-fail:33, hw-err:0
leading-zeroes:42 idle promils[s/m]:6300/75, rate:0gh/s asic-count:8 (wins:8+9)
Fan:60, conseq:16
AC2DC BAD: 0 0
R/NR: 32/0
RTF asics: 0
FET: 0:5 1:5
2 restarted 0 reset 0 reset2 0 fake_wins
0 stuck_bist 0 low_power 0 stuck_pll 0 runtime_dsble
0 purge_queue 0 read_timeouts 12 dc2dc_i2c 0 read_tmout2 0 read_crptn
0 purge_queue3 0 bad_idle
0 err_murata
Adapter queues: rsp=0, req=24
15/11 16:57:35:EXIT::: got signal !
15/11 16:57:38:Signal
Thing is I am getting ALOT of dc2dc_i2c errors. I most my miner will go is for about 10 mins then it becomes unresponsive. I can't even log into it at this point. Thats why I also posted the System recovery log.
