"Corsair’s latest high performance heatsink uses something called Dual-Path Heat Xchange. This combined with the additional cooling provided by the Corsair Dominator Airflow Fan allow these parts to run at 1066 MHz at 2.2v VDIMM and remain cool. While most manufacturers have settled on putting out 2 x 2GB kits of PC2-6400 Corsair is determined to take over the high end of the market with this 4GB kit of PC2-1066..."