| 481SD | 591SGQ | 690PG | |
| Layer 4 Performance | |||
| Maximum concurrent connections | 1,440,000* | 2,880,000* | 5,760,000* |
| Maximum transactions per second | 65,000 | 100,000 | 200,000 |
| Maximum throughput per second | 1.1 GBits | 2.0 GBits | 4 GBits |
| Maximum Interne link speed | 4 X T3 | 2 X OC-12 | 3 X OC-12 |
| Layer 7 & SSL Acceleration | |||
| Max. 1024bit RSA terminations/second (round trip) | 300 | 600 |
4,000 |
| Number of SSL certificates | 32 | 32 | 32 |
| HTTP Compression | Yes | Yes | Yes |
| TCP Optimization | Yes | Yes | Yes |
| Load Balancing Methods | |||
| Cookie content based | Yes | Yes | Yes |
| URL based | Yes | Yes | Yes |
| Round-robin | Yes | Yes | Yes |
| Persistent round-robin | Yes | Yes | Yes |
| Weighted round-robin | Yes | Yes | Yes |
| Persistent weighted round-robin | Yes | Yes | Yes |
| Least connections | Yes | Yes | Yes |
| Persistent least connections | Yes | Yes | Yes |
| Weighted least connections | Yes | Yes | Yes |
| Persistent weighted least connections | Yes | Yes | Yes |
| Traffic Management Methods | |||
| URL based content switch | Yes | Yes | Yes |
| Cookie based content switch | Yes | Yes | Yes |
| Fault Tolerance | |||
| Diskless design | Yes | Yes | Yes |
| Port aggregation | Yes | Yes | Yes |
| Failover via network connection | Optional | Optional | Optional |
| Failover via Multiple ISP links | Yes | Yes | Yes |
| Failover via Ethernet link | Yes | Yes | Yes |
| Service-aware | Yes | Yes | Yes |
| Server-aware | Yes | Yes | Yes |
| Backup server | Yes | Yes | Yes |
| Security | |||
| Network Address Translation (NAT) | Yes | Yes | Yes |
| TCP SYN protection | Yes | Yes | Yes |
| Address mapping | Yes | Yes | Yes |
| Port mapping | Yes | Yes | Yes |
| TCP DoS protection | Yes | Yes | Yes |
| Smart DDoS protection | Yes | Yes | Yes |
| HTTPS/SSH management | Yes | Yes | Yes |
| Topologies | |||
| 10/100/1000 Ethernet | Yes | Yes | 20 Ports |
| Built-in Switch | No | No | Yes |
| Multiple Tag based VLANs | Yes | Yes | Yes |
| Rackmount form factor | 1U | 1U | 2U |
| Redundant Power Supply | No | No | Yes |
| Device support | |||
| Interface to switches | Gigabit x2 | Gigabit x2 | Gigabit 20+4 |
| Maximum virtual servers | Unlimited | Unlimited | Unlimited |
| Maximum real servers | 65,532 | 65,532 | 65,532 |
| Device's role in the network | bridge/router | bridge/router | bridge/router |
| UDP-based service support | Yes | Yes | Yes |
| Management | |||
| Secure web browser access | Yes | Yes | Yes |
| In service / Not in service | Yes | Yes | Yes |
| Phone / pager alarm notification | Yes | Yes | Yes |
| Email notification | Yes | Yes | Yes |
| Configuration access | Yes | Yes | Yes |
| Persistent connections | Yes | Yes | Yes |
| Port-specific services | Yes | Yes | Yes |
| Miscellaneous | |||
| Factory warranty | 3 years | 3 years | 3 years |
| Free telephone and email support | 3 years | 3 years | 3 years |
| Free factory pre-configuration | Yes | Yes | Yes |
| Overnight pre-sent exchange unit | Optional | Optional | Optional |
| 24x7 Gold Premium Support | Optional | Optional | Optional |
| 30-day money-back guarantee | Yes | Yes | Yes |
| Power Consumption (MAX) | 120W | 200W | 350W |
| Current at 115V | 2.5A | 3.5A | 5A |
| Heat Production | 350BTU/H | 550BTU/H | 800BTU/H |