Re: 2x ASUS 7950 low voltage problem

So as a conclusion: It is possible to run 2x ASUS 7950 without low voltage problems by upgrading to the newest drivers (for Ubuntu). I solved the overheating problem by underclocking the hotter GPU:

GPU 0: 75.0 C

Code:

GPU 0: 442.0 / 434.6 Kh/s | A:103 R:0 HW:0 U:3.04/m I:20
75.0 C F: 87% (3582 RPM) E: 725 MHz M: 850 Mhz V: 1.090V A: 99% P: 20%
Last initialised: [2013-05-03 16:02:34]
Intensity: 20
Thread 0: 443.0 Kh/s Enabled ALIVE

GPU 1: 72.0 C

Code:

GPU 1: 599.7 / 576.8 Kh/s | A:89 R:12 HW:0 U:2.62/m I:20
72.0 C F: 36% (2092 RPM) E: 1100 MHz M: 1375 Mhz V: 1.090V A: 99% P: 20%
Last initialised: [2013-05-03 16:02:34]
Intensity: 20
Thread 1: 599.4 Kh/s Enabled ALIVE

The overall performance I get is slightly more than 1Mh/s:

Code:

cgminer version 3.1.0 - Started: [2013-05-03 16:02:29]
--------------------------------------------------------------------------------
(5s):888.3K (avg):1.009Mh/s | A:205 R:12 HW:0 U:5.8/m WU:886.2/m
ST: 2 SS: 0 NB: 11 LW: 191 GF: 0 RF: 0
Connected to ltcmine.ru diff 128 with stratum as user hsk81_0
Block: d5e66ac92a1de975... Diff:31.6M Started: [16:35:18] Best share: 127K
--------------------------------------------------------------------------------
[P]ool management [G]PU management [S]ettings [D]isplay options [Q]uit
GPU 0: 75.0C 3584RPM | 396.6K/434.2Kh/s | A:107 R: 0 HW:0 U:3.02/m I:20
GPU 1: 72.0C 1987RPM | 499.6K/577.1Kh/s | A: 99 R:12 HW:0 U:2.79/m I:20
--------------------------------------------------------------------------------

I use the following command line:

Code:

#!/bin/bash

export DISPLAY=:0 ;
export GPU_MAX_ALLOC_PERCENT=100 ;
export GPU_USE_SYNC_OBJECTS=1 ;

LTCPOOL=${1-"http://my-pool.tld:port"}
LTCUSER=${2-"my-username"}
LTCPASS=${3-"my-password"}

INTENSITY=20 ; ## -I $INTENSITY
THREAD_CONCURRENCY=16384 ; ## --thread-concurrency $THREAD_CONCURRENCY
GPU_ENGINE=725,1100 ; ## --gpu-engine $GPU_ENGINE
GPU_MEMCLOCK=850,1375 ; ## --gpu-memclock $GPU_MEMCLOCK
GPU_POWERTUNE=20 ; ## --gpu-powertune $GPU_POWERTUNE

cd /opt/cgminer && rm -f *.bin && ./cgminer --scrypt --auto-fan \
--url $LTCPOOL --userpass $LTCUSER:$LTCPASS \
--thread-concurrency $THREAD_CONCURRENCY -I $INTENSITY \
--gpu-engine $GPU_ENGINE --gpu-memclock $GPU_MEMCLOCK \
--gpu-powertune $GPU_POWERTUNE

If somebody has better performance with both ASUS 7950 running at lower or equal 75 C degrees, then please share it. Thanks. Cheesy