If you don't have Gen2 the --zombie-tune 2 will not work and you should change 2 for 1 or 0.
The idea is to run miner-show, to see why it crash. Without that information is not possible to know where is the problem.
ZM 0 is why it crashed
it runs ZM 2 and 1 no problem
ZM 2 the 4 cards run about 7Mh
ZM 1 the 4 cards run about 17Mh
im assuming the hashrate drop is because of the pcie splitter, im swapping mobos later to make sure
but ZM 0 crashes all my rigs, not just the problem one