That's bullshit. I just tried with 6 GPUs. 60% loss in hashrate + full crash of the system.
I just tried once but the result was absolutely terrible.
EDIT : Also crashed from a friend.
Try my setup.
Woot! I increased my earnings big time now.
OS: Windows 7 64 bit
Miners: nheqminer_v0.3a, genoil-0.4.1,
Claymore 8.0.7nheqminer (CPU, R9 280x: = 37 Sol/s
genoil-0.4.1 (RX 480, R9 380x): = 21.78 Sol/s
Claymore (mining Eth): = 45.6 MH/s
Pools: Coinotron and Suprnova
CPU: AMD FX-8370 Eight-Core Processor
Claymore by itself 60 MH/s
nheqminer by itself 50 Sol/s
Total Mining now. Ethereum: 45.6 MH/s ZCash: 58.78 Sol/s.
I actually increased over my solo mining of ZCash.
If you do not have older cards like R9 280x you may get by with just genoil-0.4.1 for GPU and nheqminer for CPU mining.
Ok now many will probably want to know what my start scripts are setup as so here you go.
My 3 start scripts for the mining
@echo off
set GPU_FORCE_64BIT_PTR 0
set GPU_MAX_ALLOC_PERCENT 100
EthDcrMiner64.exe -epool coinotron.com:3344 -ewal -esm 2 -epsw -allpools 1 -ethi 1,1,1
@echo on
genoil.exe -c zec.suprnova.cc:2142 -u -p -g 1 2
nheqminer_suprnova.exe -u -p -t 4 -od 0