Which one to buy?

Have:
processor AMD FX (tm) - 8320 Eight
mother ASUSTek M5A97
video ASUS Radeon R9 270X, R9270X-DC2T -2GD5, 2GB, GDDR5, OC, Ret
memory DIMM3: SK Hynix HMT351U6CFR8C-H9 8 Gig
power Corsair CX600M 600W
continuously open Chrome on, with tabs, 7 gig is occupied by RAM from 8. Advise 2 to 8, what brand and model. Considered hooper x and savage.