Corsair has listed the IC's used in each of their kits. I know i4memory has the list. Actually the new 3x2 kits are clocking like crazy though.
These right here are either Samsung HCFO or the new 50nm Eldipa IC's that are crushing super pi records. Both IC's are sweet chips. These aren't much more either.
http://www.newegg.com/Product/Produc...82E16820104082