780Ti "result does not validate on CPU" on second card.

[SpencerCarstens]

System :

• Windows 7 64bit
• Two 780Ti Classifieds
• Fresh install drivers and cuda
• Not overclocked (currently)
• cudaminer-2013-12-18

Issue :

Trying to run more than one card causes one to not validate on CPU.

Testing :

• I have tried every configuration under the sun including no params at all.
• I can run either card alone just fine.
• When attempted to run together, the one the throws validation issues isn't always the same.

When running two I get "result does not validate on CPU".

When running one I get this (which is good) :

[2014-01-25 16:37:12] GPU #1: GeForce GTX 780 Ti, 629760 hashes, 662.87 khash/s
[2014-01-25 16:37:12] accepted: 22281/22867 (97.44%), 662.87 khash/s (yay!!!)
[2014-01-25 16:37:13] GPU #1: GeForce GTX 780 Ti, 552960 hashes, 660.61 khash/s
[2014-01-25 16:37:13] accepted: 22282/22868 (97.44%), 660.61 khash/s (yay!!!)
[2014-01-25 16:37:14] GPU #1: GeForce GTX 780 Ti, 1090560 hashes, 669.02 khash/s

Both cards :

@ECHO off
set GPU_MAX_ALLOC_PERCENT=100
cudaminer.exe -O *myaccount* -o stratum+tcp://www.shibepool.com:3333 
-i 1,0 -C 2 -m 1 -H 1 -d 0,1 -l T15x32 
PAUSE

One card only (works on both) :

@ECHO off
set GPU_MAX_ALLOC_PERCENT=100
cudaminer.exe -O *myaccount* -o stratum+tcp://www.shibepool.com:3333 
-i 0 -C 2 -m 1 -H 1 -d 1 -l T15x32 
PAUSE

[cbuchner1]

there are problems running two devices with one cudaminer instance ever since I switched to CUDA 5.5

don't yet know what is causing it, sorry.

[SpencerCarstens]

Thanks for the info. I have gotten it to work with two instances. Unsure why it didn't work when I tried it earlier.