The Antec Kuhler H2O 920's Block Compatibility: Intel LGA 1150 / 1155 / 1156 / 1366, AMD AM2 / AM3 / AM2+ / AM3+.
The NZXT Phantom supports motherboards: E-ATX, ATX, MICRO-ATX, ITX
CPU Socket Type: Socket AM3+
I think it should depend on your motherboard, which seems to be an AM3+ mobo.
As long as it fits within those specifications, you'll be fine.