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Author Topic: One of my 3 GPU does not keep cgminer memory/engine clock settings  (Read 609 times)
bomberb17
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February 09, 2014, 10:56:45 AM
 #1

Hello all,
My mining rig has 3x Sapphire 7950's, my OS is Xubuntu 12.10 and I'm using cgminer. All of the GPUs are undervolted to 1081 mV.
I'm having a strange problem: The 2nd GPU, which is between the other two, has a significant lower hash rate than the others!

Code:
cgminer version 3.7.2 - Started: [2014-02-09 12:31:05]
--------------------------------------------------------------------------------
 (5s):1.767M (avg):1.724Mh/s | A:34426  R:2652  HW:0  WU:1541.5/m
 ST: 2  SS: 0  NB: 21  LW: 248  GF: 0  RF: 0
 Connected to stratum.fast-pool.com diff 839 with stratum as user bomberb17.1
 Block: 5703c08d...  Diff:1.39K  Started: [12:49:57]  Best share: 85.6K
--------------------------------------------------------------------------------
 [P]ool management [G]PU management [S]ettings [D]isplay options [Q]uit
 GPU 0:  76.9C 2542RPM | 613.0K/595.6Kh/s | A:14435 R: 326 HW:0 WU: 525.5/m I:20
 GPU 1:  77.2C 2576RPM | 521.8K/541.0Kh/s | A: 9151 R:2000 HW:0 WU: 504.7/m I:20
 GPU 2:  60.5C 1988RPM | 607.6K/591.3Kh/s | A:11678 R: 326 HW:0 WU: 526.6/m I:20
--------------------------------------------------------------------------------

My cgminer settings are
Code:
cgminer --scrypt -o stratum+tcp://stratum.fast-pool.com:3002 -u bomberb17.1 -p 1 -I 20 --thread-concurrency 24000 --gpu-engine 1050 --gpu-memclock 1500  --worksize 256 -g 1 --lookup-gap 2

I tried to change its clock settings from within cgminer, but I see that it is clocked lower than the other 2!
So when I hit 'G' for [G]PU management I get
Code:
GPU 0: 603.2 / 595.2 Kh/s | A:20  R:1  HW:0  U:0.83/m  I:20
76.8 C  F: 59% (2537 RPM)  E: 1050 MHz  M: 1500 Mhz  V: 1.081V  A: 99%  P: 0%
Last initialised: [2014-02-09 12:31:05]
Intensity: 20
Thread 0: 602.1 Kh/s Enabled ALIVE

GPU 1: 561.0 / 541.0 Kh/s | A:16  R:1  HW:0  U:0.66/m  I:20
77.4 C  F: 59% (2581 RPM)  E: 850 MHz  M: 1250 Mhz  V: 1.081V  A: 100%  P: 0%
Last initialised: [2014-02-09 12:31:06]
Intensity: 20
Thread 1: 560.2 Kh/s Enabled ALIVE

GPU 2: 607.8 / 592.3 Kh/s | A:23  R:1  HW:0  U:0.95/m  I:20
60.2 C  F: 48% (1982 RPM)  E: 1050 MHz  M: 1500 Mhz  V: 1.081V  A: 99%  P: 0%
Last initialised: [2014-02-09 12:31:06]
Intensity: 20
Thread 2: 611.6 Kh/s Enabled ALIVE

I then try to change its clock settings, it changes to 1050/1500 for a few seconds then it goes back to 850/1250!
Any ideas to solve this???

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February 09, 2014, 02:57:37 PM
 #2

I also noticed that if I restart cgminer, then the clock remains to that set for all cards, but after a few minutes it drops itself to 850/1250 for GPU1.

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