In version 3.x, a lot has changed.
These changes are as follows:
Hardpoint Killstreaks:
AC130
Helicopter
Airstrike
UAV Radar
Juggernaut
Predator
Sentrygun
Nuke Bomb
Carepackage
Carepackage Hardpoints:
AC130
Helicopter
Airstrike
UAV Radar
Predator
Juggernaut
Gametypes:
New Gungame Edition
New Juggernaut
New Kill Comfirmed
New Demolition
Not compatible Maps:
Backlot (Server can crashing in the Map rotation)
Minimum system hardware:
CPU: AMD X4
RAM: 4 GB (for v3.4)
Graphics Engine modification:
In version 3.0, the graphics engine of the game Call of Duty 4 Modified!
Therefore, it may happen that your game crashes from time to time.