The Noctua NH-U12P will be tested directly against the Thermalright Ultra 120 on the same system. Both heatsinks were tested with one fan blowing against the heatsink, or two fans in a push-pull configuration. For these tests, Noctua NF-P12 and Panaflo FBA12G12M1A fans were used to cool the heatsinks. The average (mean) temperature of the CPU cores will be recorded when the CPU is at idle and at load (four core load from Prime95 v25.3, Torture Test, Large FFTs), for scenarios when the CPU is at stock speed/volts (Q6600 @ 2400 MHz, 1.296v/1.280v), and also overclocked/overvolted (Q6600 @ 3400 MHz, 1.536v/1.504v).