With CISCO ASA firewalls, you can CISCO ASA 5505 integrate multiple enterprise-class, next-generation network security services without sacrificing performance. Cisco ASA combines the most deployed stateful inspection firewall in the industry with next-generation firewall capabilities. CISCO ASA 5505

about the ASA 5500 and ASA 5500-X Series for small and branch offices.

Cisco ASA Model	ASA 5505 / Security Plus	ASA 5510 / Security Plus	ASA 5512-X / Security Plus	ASA 5515-X
End-Of-Life/End-of Sale (9/16/13) CISCO ASA 5505		X
Stateful Inspection throughput (max1)  CISCO ASA 5505	Up to 150 Mbps	Up to 300 Mbps	1 Gbps	1.2 Gbps
Stateful Inspection throughput (multiprotocol2)	-	-	500 Mbps	600 Mbps
Next-Generation throughput3(multiprotocol) CISCO ASA 5505	-	-	200 Mbps	350 Mbps
ASA IPS Throughput4 CISCO ASA 5505	Up to 75 Mbps with AIP SSC-5	Up to 150 Mbps with AIP SSM-10; 300 Mbps with AIP SSM-20	250 Mbps (Extra hardware module not required)	400 Mbps (Extra hardware module not required)
Concurrent sessions	10,000 /25,000	50,000 /130,000	100,000	250,000
Connections per second	4,000	9,000	10,000	15,000
Packets per second (64 byte)	85,000	190,000	450,000	500,000
3DES/AES VPN throughput5	100 Mbps	170 Mbps	200 Mbps	250 Mbps
Site-to-site and IPsec IKEv1 client VPN user sessions	10/25	250	250	250
Cisco AnyConnect or Clientless VPN User Sessions6 (AnyConnect license required)	25	250	250	250
Cisco Cloud Web Security users	25	75	100	250
VLANs  CISCO ASA 5505	3 (trunking disabled) / 20 (trunking enabled)	50 / 100	50 / 100	100
High-availability support7 CISCO ASA 5505	Stateless Active/Standby Only*	Active/Acitve* and Active/Standby*	Active/Acitve* and Active/Standby*	A/A and A/S
Integrated I/O CISCO ASA 5505	8-port FE with 2 Power over Ethernet (PoE) ports	5-port FE / 2-port 10/100/1000, 3-port FE	6-port 10/100/1000	6-port 10/100/1000
Expansion I/O	Not available	4-port 10/100/1000 or 4-port GE (SFP)	6-port 10/100/1000 or 6-port GE (SFP)	6-port 10/100/1000 or 6-port GE (SFP)
Dual power supplies	Not available	Not available	Not available	Not available
Power  CISCO ASA 5505	AC/DC	AC/DC	AC/DC	AC/DC

1 Maximum throughput with UDP traffic measured under ideal test conditions
2 Multiprotocol = Traffic profile consisting primarily of TCP-based protocols/applications like HTTP, SMTP, FTP, IMAPv4, BitTorrent, and DNS
3Throughput was measured using ASA CX Software Release 9.1.1 with multi-protocol traffic profile with both Application Visibility Control (AVC) and Web Security Essentials (WSE). Traffic logging was enabled as well.
4 Firewall traffic that does not go through IPS service can have higher throughput. 
5 VPN throughput and sessions count depend on the ASA device configuration and VPN traffic patterns. These elements should be taken into consideration as part of your capacity planning. Maximum throughput numbers are based on IPsec IKEv1 Remote Access VPN Connectivity.  CISCO ASA 5505
6 2 AnyConnect Premium User Licenses are included by default
7 A/A = Active/Active; A/S = Active/Standby 
* Requires security plus license CISCO ASA 5505