i have a problem with my GPU. games that i used to have no problems playing now run like trash and i dont know why. my fans speed up and slow down and keeps changing. i dont know if its a power issue or what. it came with win 8 but i upgraded to win 10. around that time i wiped my computer and ever since i have been only been able to run basic games like minecraft and league of legends. before i used to play fallout and guild wars 2. im not sure if its running off of my on board graphics or something. can anyone give me a hand?