Looking to add a SSD to my several-year-old desktop PC. Asus P867LE motherboard, Intel Core i5 3.2GHz, 32G ram, etc. When I had built this system several years ago, it maxxed out all speed tests except hard drive access times. My computer's case broke (power button won't work), and I'm transferring everything over to a new case, and thought I might want to add a ~500Gb SSD to the mix now while I'm at it. Not sure which to get. 3-bit or 4-bit?