scroll up and read threads!? …you will find your way 
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I answer to myself (for those who would have the same problem). Since it seems that people are much more competent to ask questions than to answer them (even when they have the solution ^^).
In pool Url, just put : %URL%
Ben.
That looks like a pretty aggressive undervolt. Was it ever stable at stock settings? I’d start with core at 1100 MHz, VDD = 700, VDDCI = 800, MVDD = 1300, and Memory at 1050 MHz. Then start scaling back voltage from there in small increments.
have you found?
this is mine, you can see it
I never charge, it’s just a system (default) 
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how far are you mining in gminer with RX 6600 XT?
do you often get problems/errors?
thanks you
excuse me, is the 48w voltage in hive.os with 32.23 Mh/s excessive under volt? I just started mining for the first time. i am mining in ethermine coin eth
is there any suggestion
Hi afif, 48w for 32.21MH/s I would say is good. Obviously that actual reading of 48w is not accurate (for AMD cards in HiveOS it seems) but it is a good indicator when trying to get the power consumption down. All these cards seem to be rather random so any model 6600 XT that will run consistently over 32MH/s with low power draw I would consider to be one of the better ones.
Here are my GPUs, a right mixed bag and there are only two different types (2x Powercolor Red Devil and 4x Asus Gaming OC Dual). GPU3 crashes daily so still trying to find the sweet spot for that card. GPU3 seems to be over-sensitive to memory voltage (mV) where as the others are not. Silicon lottery.
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If you want to save more power start dropping the MVDD (1344) in increments of 4 or 5 until it crashes then up in increments of 2 until it is stable. Run your rig for a few days beforehand so you know it is stable before doing this or you may go round in circles for a while. You can also try dropping VDD (670) in the same way. I do suggest you do MVDD first then do VDD after. MVDD seems to have a bigger impact on power consumption from my personal observations, your mileage may vary of course.
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thank you batfink, I was very helpful with your advice. I also appreciate your 3rd gpu having a problem.
oh well I’ll try changing my vga settings, thanks for the advice batfink.
Load new hiveos from site
it works
How did you managed to overclock memory over 1075mhz?
I thought all rx6000 will lock core to 500mhz if you override stock settings.
i copied your in-depth settings and tip’s, was able to get the watt’s down by about 9-12w per card, thank you now they are superb efficient…
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Sweet mate!! You have some nice cards there
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yes seems like i was lucky, just one this one card with 48w 
but im really impressed, didn’t thought i could save another 10w per card… wow amazing! thanks to you
you can save a few extra watts across your cards if you drop the SOC settings as well…
Try this, if it crashes up the VDDmax by 5 until its stable.
Lowest I can get one of my 6600XTs to run is 418/765 - highest is 420/775
This was mentioned by someone else way up this thread so credit goes to them 
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Hi apfelwein, what model Powercolor are your cards? I am interested to see if there are any noticeable differences across the three 6600 XT types (Fighter / HellHound / Red Devil) that justify the price difference (for mining).
may i have a full screenshoot of your OC setup?