I have a i5 2500k OC at 4.4ghz on a ASUS P8Z68-V PRO/GEN3 , 8 ghz of dominator 1600mhz a sapphire r9 280x 128 g ssd and a 1 terra hydrid hdd with a TX750. I wan a tesst bench but its so rare a good one at a good price... So i have cash for upgrade wath do you sugest me ?