Quote from: thenewguy_intown on January 31, 2018, 11:33:45 AM

But if use 2 different site pools for dual mining or use 1 site pool for dual mining , both are equal or i.e. 1% for eth pool and 1% for dcr/sia/other pool (apart from dev fee) ??

or if I dual mine using lets say same pool e.g. nanopool ETH+SIA then will I pay less pool fee i.e. only 1 time 1% ??

All mentions - purely arbitrary, purely theoretical calculations.
Solo mining:
Claymore takes 1%, you are left with 99% ETH PoW time (effort)
Ethermine pool takes 1% of your 99% ETH effort
Ideally, you should be left with 98%
Dual mining:
Claymore takes 2%, 98% left, can be truncated to 95% (dual gives more incorrect and stale shares)
Ethermine takes 1% of your 95%
You are left with ~94%
Siamining takes 3% of your Sia effort, Claymore takes none

PS:
1. Siacoin is not anymore viable for GPU mining (difficulty and net hashrate skyrocketed).
2. Luck factor makes the effective hashrate fluctuate 10-15% up and down.
3. For AMD RX, optimal dcri values can boost the ETH hashrate by 2-3%. However, incorrect share ratio tends to be about 1-2%, so it levels out.

Quote from: Tandro on January 31, 2018, 03:46:14 PM

-dcri 85

This is your problem. Too high dual mining intensity crashes the GPUs.