I am building my first water cooled system and plan on only applying the water cooling to two 7970s. The case I'm using for this build is a Define R4. So far I have purchased two XSPC Razor Waterblocks for the 7970s, and plan on buying the following major components to complete the build... D5 Dual Bay Reservoir/Pump Combo Black Ice GT Stealth 240 Radiator What do you guys think? Is that radiator sufficient? Do I need any other components besides tubing, water block fasteners, radiator fans, and hose clamps?