So my cousin has asked me to upgrade his computer to better play games and to be better performance wise. I found out his computer is a hp pavilion p6677c. I then found out it doesnt not have a graphics card and that might be the biggest way to fix it. He wants me to find something to upgrade and has given me a $300 budget. So I found the gigabyte gtx 660 2 gb gpu(http://www.amazon.com/Gigabyte-PCI-Express-Displayport-Graphics-GV-N660OC-2GD/dp/B00942TK8I). Its listed at 190.00. However because of the computer he has, a psu upgrade will be required. Im thinking of getting a 500w psu but I am not sure if that will suffice. I also do not know any good psu for gaming and performance that are maybe under $60(Im trying to find the cheapest psu too because of the strict budget and he also wants a pair of headphones with the left over money from the upgrade. He would be willingly to add in an extra 40.00 for some headphones if thats the case.) So my question is, is the gpu a good upgrade(and will it fit) for the computer he has, even with the processor and the motherboard it has? And what psu should I consider? If possible, the upgrades should be aimed for gaming improvement.
-Thank you.
-Thank you.