I have a Dell Precision T3500 with 2 Western Digital Black HDDs currently installed inside it. Since my registry is clogged up and my PC is slow but SSDs have dropped in price I want to get a Western Digital Green 120GB SSD and reinstall Windows. However I am unsure about enabling AHCI because of other threads created. So my question is would there be a problem if I just plug in the SSD, go into BIOS, enable AHCI and reinstall Windows 7? One thing I would like to specify is that I won't be plugging in the SSD straight into the motherboard. I will be plugging it in a SATA 3 PCI-E card so I am not limited by my motherboards SATA 2 capabilities in terms of speed. I will back up all of my specific files from both of my current HDDs and plan on keeping them inside as storage drives. All of the other parts are specified in my signature underneath this box of text. Hope I've been clear enough, but if someone needs extra detail, I am happy to answer questions.