Invest in a solid state drive. You have more than enough memory.
Do you use Adobe Photoshop products? Have you visited the Adobe forums? They have a web page with recommendations for improving performance and some advice about solid state drives. Last time I looked they recommended one ssd for the OS and Adobe products, one ssd for a scratch drive, and a hard drive for storing raw and finished images. I didn't bother with a scratch drive and still do pretty good.