How can I build a rig that’s quiet so I can put it in bedroom without spending lots for liquid cooling? Like is it much louder if I use 2 evga G3 750w psu rather than 1 evga 1600w? Also are blower type cards more quiet than cards with 3 fans?
Blower cards tend to be LOUDER, as they usually have to run higher fan settings to stay cool.
Cards with good cooling, set for efficient mining, in a riser rig with plenty of space between the cards, will usually result in a very quiet rig.
Use a standard box-type fan instead of small computer fans also tends to help keep it quiet, as you can probably leave the fan set on "low" and still get more than enough airflow.
Due to ram shortages and pricing on RAM, 1080 ti cards are "worth" more like $800 now - and that's not looking likely to change for quite a while.
The additional heat in a small room like a bedroom might be an issue though, especially if your rig is fairly high powered.