Thanks a lot, I tried with 3 cards and it is working like a charm
If I enable 4+ cards it start the error cycle again.
I am still looking for a way to run all 8 cards on the rig.
The rig is having dual core G5420 CPU @3.80GHz AES with 16GB ram from which I have 13.8 GB free.
On another 2 identical rigs equipped with dual core i3-2310M CPU @2.1 Ghz with 8gb ram - 6.3 free I am running 8xA2000 6GB cards without any issues.