pny ssd slow

I just installed a new PNY Optima 240GB SSD that I bought 4 years ago (I bought it for $150 on sale,and Newegg still has it at $150!!) in an Asus m51AC (bought around the same time). I also replaced the 1T hd with a Seagate 3T and did a fresh install of Win 8.1. It feels lightning fast! But I...