Active-Active FortiGate HA Throughput

Hi, Just want to make sure. If I implement active-active HA of Fortigate, does it increase the throughput? Let says, 1 unit fortigate has 4Gbps throughput for threat protection (FGT-1200D). When I configure A-A HA, can the cluster of 2 units FGT handle up to 8Gbps threat protection throughput? Thank you