Hello My PC spec is as follows: Asrock P67 Extreme4 Intel i5-2500K OC to 4.8 GHz Noctua NH-D14 Cooler PCI Sata/IDE Controller - Rosewill RC-215 4x2GB G Skill Ripjaws Ram 4x 2TB Drives, 1x 1TB Drives, 2x Sata Notebook Drives, 1x IDE Notebook Drive, 1x Kingston V 100+ 96GB SSD 2x Radeon HD 6950 stock clocks and Bios (One is out for RMA - going to crossfire when it arrives) 4x 120mm Fans, 1x 140mm Fan, 1x 80mm Fan Antec EA-650 Earthwatts 650w PSU I would like to know if my PSU is sufficient to crossfire with the current spec, or should I upgrade? I am, currently strapped for cash and would like to avoid upgrading the PSU. Also, I would like to know what are the symptoms of suffering from an overloaded PSU? Thank You