[The real issue is that gpu 1 will frequent heat up to 90C]

I have a Sapphire 7990 running cgminer 3.7.2 with the following config
cgminer --scrypt -o http://us.wemineltc.com:80 -u user -p password --gpu-vddc 1.15 --auto-fan --auto-gpu -g 2 -I 12,11 --gpu-engine 600-1100,300-900 --gpu-memclock 1500,1000 --thread-concurrency 8192,8192 -w 256,256 --temp-target 75,75 --temp-overheat 80,80 --temp-cutoff 85,85 --temp-hysteresis 3

Couple of things I would appreciate help with
--gpu-vddc 1.15 doesn't seem to change the voltage notice gpu 0 is at 1.20 and gpu 1 is at 1.17
I am trying to reduce the voltage in order to reduce temp on gpu 1

More important is the fact that gpu 1 consistently seems to under perform i.e. it never mines at more than 300Kh/s compared to gpu 0 which has sometimes mined at around 450Kh/s and more at around 75C

The real issue is that gpu 1 will frequent heat up to 90C and while cgminer says it is reducing or even disabling gpu 1 it seems to stay at the nasty temp levels.

Is it possible that there is something wrong with the card or gpu 1?  I've heard people claim to hit over 1000Kh/s with stock fans.

I am running a Cooler Master haf case with Fan on the side pushing air in, fan on the front pushing air in and fan on the top pushing air out.

This is true even running at night with the window open the inside room temp is well under 60F
If I change -I 12,11 to -I 13,11 it increases gpu 0 Kh/s but will always send gpu 1 to over 90C???

Thanks for any help.
 
 cgminer version 3.7.2 - Started: [2013-12-14 09:50:09]
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 (5s):722.8K (avg):669.4Kh/s | A:50800  R:0  HW:0  WU:585.2/m
 ST: 2  SS: 0  NB: 38  LW: 1033  GF: 0  RF: 0
 Connected to us.wemineltc.com diff 208 with stratum as user myuser
 Block: bbf31f63...  Diff:2.93K  Started: [11:09:43]  Best share: 42.4K
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 [P]ool management [G]PU management (S)ettings [D]isplay options [Q]uit
 GPU 0:  74.0C 4037RPM | 427.5K/377.6Kh/s | A:29120 R:0 HW:0 WU: 333.9/m I:12
 GPU 1:  78.0C 3773RPM | 292.0K/292.0Kh/s | A:21680 R:0 HW:0 WU: 251.2/m I:11
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GPU 0: 303.3 / 378.8 Kh/s | A:129  R:0  HW:0  U:1.55/m  I:12
74.0 C  F: 85% (4035 RPM)  E: 1100 MHz  M: 1500 Mhz  V: 1.200V  A: 99%  P: 0%
Last initialised: [2013-12-14 09:50:09]
Intensity: 12
Thread 0: 151.3 Kh/s Enabled ALIVE
Thread 1: 151.9 Kh/s Enabled ALIVE

GPU 1: 287.0 / 292.2 Kh/s | A:101  R:0  HW:0  U:1.21/m  I:11
75.0 C  F: 85% (3767 RPM)  E: 750 MHz  M: 1000 Mhz  V: 1.170V  A: 99%  P: 0%
Last initialised: [2013-12-14 09:50:09]
Intensity: 11
Thread 2: 143.7 Kh/s Enabled ALIVE
Thread 3: 143.7 Kh/s Enabled ALIVE

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