Hey all. looking to get my son a new graphics card to replace the gt610. What would be a good replacement to play Arma3,BF4,COD Ghost and such. The pc is a Powerspec B821 and has a 300 watt power supply so would i need to replace that as well? This pc has a i5 - 3570K Processor and a Intel DH77EB board. Would i need a new cooler or do these new graphic cards keep themselves cool? Any help would be appreciated. Thank you and Happy Holidays.