Yes, I believe so, this are the current specs:
ScreenOS version tested
ScreenOS 6.2
Firewall Perf (Large Packets)
350+ Mbps
Firewall Performance (IMIX)
300 Mbps
Firewall Packets Per Second
100,000 PPS
3DES+SHA-1 VPN Perf
100 Mbps
Concurrent VPN Tunnels
500
Max Concurrent Sessions
48,000
New Sessions/Second
8,000
Max Security Policies
1,000
Max Security Zones
40
Max Virtual Routers
6
Max Virtual LANs
100
Fixed I/O
8x10/100, 2x10/100/1000
Mini-Physical Interface Module (Mini-PIM) Expansion Slots
0
Physical Interface Module (PIM) Expansion Slots
4
Enhanced PIM (EPIM) Expansion Slots
0
802.11 a/b/g
No
Convertible to JUNOS
No