The minimum throughput and ISP ports is depend on the Sangfor Secure SD-WAN appliance model.
Minimum using M4500F-I are below:
Firewall Throughput - 2GBPS
NGFW Throughput - 1.4GBPS
IPS + WAF Throughput (HTTP) - 1.2GBPS
Threat Protection Throughput - 1GBPS
IPsec VPN Throughput - 250MBPS
Please refer to the link below for the SANGFOR SECURE SD-WAN MODELs: