5 boxing on one PC

Windows 7
Core2Quad 9550 OC'd to 3.0 GHz
8GB RAM
ATI 4890
Logitech G110 keyboard
Logitech G700 mouse
Dell 24" 1920x1200
Acer 21.5" 1920x1080

Currently 5 boxing RIFT with main at custom low render settings capped at 25 FPS in ISB and slaves at low render capped at 15 FPS