With the SGs being end of life now, it is difficult to find any current performance data.
However, I have managed to dig out an old comparison matrix from 2006. It doesn't include the 560U, as that appliance didn't exist at that time. But the 560 is listed and has a "Stateful Inspection Throughput" value of 120Mbps.
The aging SG line is reaching its performance limits in todays world.
While it will perform in the 120Mbps full duplex ( 60Meg each way ), this will be a best figure, taken with 1500 byte packets.
It is the packets per second that create the heaviest load on the unit, not the data throughput.
With todays numerous modern applications using many small byte packets, the SG line is starting to show its age.
Hope this helps.
Guys thanks for the responses. Clearly we need to invest in something a bit beefier to match the capabilities of our fibre. Quick question though, is there a way to sample packet size on the unit? Average would be interesting, histogram would be better.
No, unfortuantly not