I'm assuming that you loud noise is fan noise and it's coming from your video card judging by your description and you'll need to find out why the video card is heating up. You can take the side panel off the cse and put a fan aimed at the video card to see if that would make it not heat up so fast plus with the side panel off it gives the fans on the video card fresh ai to use. If you have a front case fan is there some obstructions to keep the flow of air from circulating through the case?
You can download the Nvidia inspector and use it to help with your problem.http://downloads.guru3d.com/NVIDIA-Inspector-220.127.116.11-download-2612.html
Also with the side panel off you can try to see if it is the video card for sure or something else.