Below is a list of bandwidth capabilities for various PC devices. The values are in Mbps which is the abbreviation for "Millions of Bits Per Second", or "Mega Bits Per Second". Mbps should not to be confused with MBps ("Mega Bytes Per Second").

Some conclusions based on the above table:

1) Standard Cable Internet connection is 4 times faster than standard DSL Internet connection.

2) Wireless "b" standard has more than enough  speed for Internet connections. It can handle approximately 3 users at full Cable Internet speed or 10 users at full DSL Internet speed. You do not get any advantage by using wireless "g" standard if you are only connected to Internet. It is a different story if you need to connect to a local network for the purpose of transferring files.  In this case wireless "g" devices would transfer files 5 times faster than wireless "b" devices. However, if you are concerned with network security, you may not want to use a wireless connection for transferring sensitive information.

3) If you are using up to two 7,200 rpm hard disk drives in your system, an ATA 100 HDD controller is more than adequate. SATA or SCSI would not give you a faster transfer rate. If you are using two 10,000 rpm HDD, than SATA 150 is optimal. For a more serious system with up to four 15,000 rpm HDD, SCSI ULTRA 320 is the only one to fully utilize the maximum transfer rate of the HDD itself.

4) It make sense to migrate to LAN 1000 for much faster file transfer within a network. Even for only two computers connected together file transfer for a LAN 100 connection will be limited by the network device and not by the HDD or processor. Also the LAN 100 network device may be the bottleneck for Internet connections if you have a OC-3 or above connectivity.