What could be the reason for one loop being significantly more power hungry on an SP20? One of the loops on my Spondoolies SP20 is misbehaving. I underclocked everything but this loop (number 4) does not seem to care what settings I make. It seems to be running at twice the speed (and wattage) at times.

Why is this?



Transcription:

Asic Stats


Uptime:502 | FPGA ver:100 
-----BOARD-0-----
PSU[UNKNOWN]: 0-&gt;120w[120 120 120] (-&gt;120w[120 120 120]) (lim=120) 0c cooling:0/0x0
-----BOARD-1-----
PSU[UNKNOWN]: 0-&gt;120,[120 120 120] (-&gt;120w(120 120 120]) (lim=120) 0c cooling:0/0x0
-----BOARD-2-----
PSU[UNKNOWN]: 0-&gt;121w(121 121 121] (-&gt;121w(121 121 121]) (lim=120) 0c cooling:0/0x0
-----BOARD-3-----
PSU[UNKNOWN]: 0-&gt;194w[193 193 194] (-&gt;194w(193 193 194]) (lim=120) 0c cooling:0/0x0
LOOP(0) ON
 0: DC2DC/1/:[vlt1:605 vlt2:610(DC1:794 T1:794 U1:727) 46W  76A 41c] ASIC:( 85c (125c) 670hz(BL: 670) 17 (E:192) F:8]
 1: DC2DC/1/:[vlt1:605 vlt2:610(0C1:794 T1:794 U1:727) 44W  72A 48c] ASIC:[ 85c (125c) 645hz(BL: 645) 15 (E:192) F:0] 
LOOP[1] ON
 2: DC2DC/1/:(vlt1:593 vlt2:597(DC1:794 T1:794 U1:727) 43W  73A 53c] ASIC:[ 85c (125c) 640hz(BL: 640)  9 (E:193) F:0]
 3: DC2DC/1/:(vlt1:593 vlt2:597(DC1:794 T1:794 U1:727) 47W  79A 56C] ASIC:[ 85c (125c) 675hz(BL: 675) 17 (E:192) F:8]
LOOP[2] ON
 4: DC2DC/1/:(vlt1:599 vlt2:605(DC1:794 T1:794 U1:727) 45W  75A 41c] ASIC:[ 85c (225c) 660hz(BL: 660) 18 (E:193) F:0]
 5: DC2DC/1/:(vlt1:601 vlt2:605(DC1:794 T1:794 U1:727) 46W  76A 52c] ASIC:[ 85c (225c) 675hz(BL: 675) 15 (E:193) F:0]
LOOP[3] ON
 6: DC2DC/1/:(vlt1:654 vlt2:658(DC1:794 T1:794 U1:727) 74W 113A 68c] ASIC:[ 85c (125c) 895hz(BL: 895) 30 (E:192) F:0]
 7: DC2DC/1/:[vlt1:654 vlt2:658(DC1:794 T1:794 U1:727) 75W 114A 77c] ASIC:[100c (125c) 905hz(BL: 905) 23 (E:193) F:0]

[H:HW:1112GH,W:423,L:0,A:8,MMtmp:0 TMP:(28)=&gt;=&gt;=&gt;(49,64)]
Pushed 28 jobs , in NW queue 4 jobs (sw:0, hw:0)!
min:14 wins:144[this/last min:6/18] bist-fail:253, hw-err:1
leading-zeroes:42 idle promils[s/m]:0/0, rate:1258gh/s asic-count:80 (wins:3+3)
Fan:70, conseq:200
AC2DC BAD: 0 0
R/NR: 487/0
RTF asics: 0
FET: 0:9 1:9
 0 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  0 dc2dc_i2c       0 read_tmout2   0 read_crptn
 0 purge_queue3   0 bad_idle 
 0 err_murata 
Adapter queues: rsp=2, req=20 


EDIT: I have found out how to get rid of the problem: Setting the start volt 0.05 below max. voltage on all loops seems to have made it more stable and the problem vanished... I still don´t know how it came about but at least I found a workaround :)
Copying asker's own answer, so that this question can be removed from the unanswered queue (assuming this answer gets upvoted).


  I have found out how to get rid of the problem: Setting the start volt 0.05 below max. voltage on all loops seems to have made it more stable and the problem vanished... I still don´t know how it came about but at least I found a workaround :)