I'm aware this topic must have been beaten to death, but allow me to ask some questions about system optimization again, mainly re. Photoshop CS4 and Cinema 4D. After doing quite some research and getting great advise on this fine forum, I have now put together this system : - mac pro 2.8 Ghz Dual, 12 GB Ram , GeForce 8800GT - Main drive Western Digital Caviar Black 500GB (system, applications, files), using less than 200GB, big files go into external archives - Stock drive Western Digital 320GB (SE16 ?) used for Bootcamp partition (XP) and Photoshop scratch disc ( 111GB partition ) - External 1TB drive/ FW 800 with Samsung Spinpoint F1/ 1TB for Time Machine - A bunch of external harddrives for archiving large files and bootable system backups - Two ACDs , 23" and 20", connected to the GeForce 8800 As for performance, my questions are only about two apps really, Photoshop CS4 in general, and C4D rendering, working with highres image files (200-500MB, lots of layers) and highres C4D renders with GI and complex materials. I have googled my behind off, but still am not a lot wiser... 1) Will I see performance gains if I run my Photoshop files off a seperate internal drive (recommendations ?), instead of having them on the system/application drive, and might that affect C4D renders as well ? 2) Given the 12GB Ram I have, should I worry about a more efficient PS scratch disc setup ? Recommendations ? 3) Cinema 4D : OpenGL previews in the editor window are working, but way too sluggish. If I ran my second display off a seperate graphic card, would that make a great difference ? 4) Where would a Raid0 configuration of two drives really improve performance, regarding the needs mentioned above, and how important is HDD speed ? 5) Anything else you can recommend ? Cheers !