i have an acer aspire x3990 and was wondering what motherboard it has as i cant find any information and also what graphics cards are compatible/ how to figure out what gpus are compatible. i want something along the lines of gtx 970 but i dont know if its compatible.
Those are great questions - for ACER.
Acer made the motherboard, and knows what slots are available on it, and what those slots can accomodate, and what will be compatible.
Contact Acer for support.