Headroom across the board. The 440 handles nearly double the max throughput of the 340 and supports 50 real servers instead of 35. Load balancing methods, content routing, and attack protection are identical between the two, so it's the same appliance with more capacity.

Yes, roughly double. The 440's SSL processing capacity scales along with its higher throughput, so if encrypted traffic is a big share of what you're serving, the 440 handles more of it without your application servers feeling the load.

One appliance handles both. The ADC 440 offloads SSL for encrypted traffic while load balancing plain HTTP traffic at the same time, so there's no need for a separate device just to manage encryption.

The ADC 540 supports 100 real servers and the ADC 640 supports 250, so there's room to grow well beyond the 440 without changing how your content rules or SSL policies are configured.

It's available across the whole lineup, including the 440. You can pair two units in an active/passive cluster so a failed primary doesn't take your applications down with it.