2 diffrent speed on R9 270x

[brattanek]

Hello, today i saw the problem on my miner. One of two graphic cards have lower KH/s. Always both have 477 KH/s. Please see pic:
http://vpx.pl/i/2014/02/10/Untitled-1qOj3C.png

My cgminer:

Code:

setx GPU_MAX_ALLOC_PERCENT 100
setx GPU_USE_SYNC_OBJECTS 1
E:\cgminer-3.7.2-windows\cgminer.exe --scrypt -o stratum+tcp://xxxxxx -u xxxxxx -p x -w 256 -I 19 -g 1 --thread-concurrency 21568 --shaders 2048 --no-submit-stale --gpu-engine 1120 --gpu-memclock 1500 --lookup-gap 2

Gigabyte ATI Radeon R9 270X 2GB DDR5/256bit DVI/HDMI/DP PCI-Express (ver. OC)
Drivers: 13.12
Windows 8.1

[alcyonm]

Can you show that your cards bios version by GPU-z

[ghettopools]

It is probably because you have different clock settings i run my 270xs at 1150 core and 1500 memory and they do 480 hash a piece.

[shorena]

Id think its the fact that GPU 0 has to take care of GFX for the OS.

But you say "always both have 477 KH/s" when did this change?

Also GPU 0 seems to run hotter. Maybe its a cooling problem? E.g. GPU 0 is above GPU 1 and the case has insufficient cooling?