secure firewall 3105 clustering

[hhamza]

is the throughput in cisco secure firewall 3105 doubled (20Gbps)when using clustering of two

[Rob Ingram · Accepted solution]

@hhamza A single 3105 supports up to 10G throughput (according to the datasheets) https://www.cisco.com/c/en/us/products/collateral/security/firewalls/secure-firewall-3100-series-ds.html  and when you combine multiple units into a cluster, you can expect the total cluster performance to be approximately 80% of the maximum combined throughput. So no could not expect to achieve 20G.

https://www.cisco.com/c/en/us/td/docs/security/secure-firewall/management-center/cluster/ftd-cluster-sec-fw.html

[MHM Cisco World]

for me Yes 
what is different between ASA active/standby and cluster is in cluster all ASA can send/receive traffic i.e. use it link to pass traffic, 
this make BW double (approximate).
above can done when we config  Spanned Etherchannel.