Intel Pentium II
Intel Pentium III (slot based)
Intel Pentium III (socket based)
Intel Pentium IV (1.3GHz-2.0GHz using RDRAM)
Intel Pentium IV (1.8GHz-3.0GHz)
Intel Pentium IV (newer model 2.8GHz-3.8GHz)
Intel Celeron (too many to list...)
or maybe you're just not getting a good comp hehe. just kidding. Yeah most games will run on a 2.4 but if you want to upgrade go with something a little higher.