Hi, thanks for good product. Had newer drivers, but in this setup only 6GPU from 8GPUS were recognised. Installed 18.6.1 drivers - now get this error. Please help

The miner is successfully finding and running all 8 GPUs in that screen shot. As for the error, the 'Failed to enqueue kernel' error means that something has gone very, very wrong with the driver, possibly due to cards crashing.
What clocks/voltages are you running on those cards?