When the speed is lower... multi GPU or Linux?

[LiveITA]

Hi, i have a multi GPU rig (9 1070 and 3 1070ti) with linux.
When i tested the cards on windows i usually got 1300kh/s on each 1070 and 1450kh/s on each 1070ti with a 17.6269 intensity (even one more and it doesn't work). Then i completed my rig installing all the cards and linuk to mine.
Now with the same settings and OC i get only 1100kh/s on each 1070 and 1300kh/s on each 1070ti.
Why is that? Is it because of linux? Is it because it's a 12 GPU rig? Or maybe i've set the intensity wrongly on linux?

This is my conf:

=== /hive/ccminer/pools.conf =================================================
{
 "_note": "DualMining",
 "pools": [
 {
 "user": "GdN3VEXFxyq2j1EXYG4msdZpVxxxxxx.amd",
 "url": "stratum+tcp://eu1.altminer.net:10000/",
 "pass": "C=GBX"
 }
 ],
 "api-bind": "0.0.0.0:4068",
 "max-temp": 85,
 "user": "GdN3VEXFxyq2j1EXYG4msdZpxxxxxxx.amd",
 "url": "stratum+tcp://eu1.altminer.net:10000/",
 "pass": "C=GBX",
 "algo": "neoscrypt",
 "intensity": 17.6269
}

Is the intensity working correclty?

[KlausT]

I think most systems are slower when there are lots of cards,
but maybe you can try the new --cuda-schedule option.
--cuda-schedule 0 is the default, but maybe 1 or 2 are better, I don't know.

[LiveITA]

Problem is that i'm on HiveOS... It still use .19 version. I'll need to wait til he upgrades your miner

[SomeBigBalls]

Using a multi-gpu setup as well. 2x1080ti , 1070, 3x1050ti
I actually get higher rates on the multi gpu rig than I do a standalone pc with the same 1070, the fact there are multiple gpu's shouldn't be an issue. The thing I am wondering is what is your CPU? As lane allowance and use could be a factor.
Getting below 1200kh/s on my 1070 only happened when my PSU wasn't up to snuff, I'd assume stability issues. However my single gpu pc with a 1070 does around 1260kh/s and my multi-gpu rig fetches around 1320kh/s and is exactly the same card, two were purchased right after another so possibly just the lottery. I'm really doubting its a multi-gpu problem, its more than likely a linux driver possibly out-dated.