http://www.apple.com/powermac/
(Quad-Core G5 Processing)
"With two dual-core processors, at speeds up to 2.5GHz per core, the Power Mac G5 Quad doubles the punch of its dual-processor predecessor. Do the math: Quad-core processing means four Velocity Engines and eight double-precision floating-point units for blistering performance of up to 76.6 gigaflops"