3300 Product Overview The PowerConnect 3324 is a 24 port Fast Ethernet switch that includes two Gigabit Ethernet ports in a rack-dense 1U form factor. The PowerConnect 3348 is a 48 port Fast Ethernet switch that includes two Gigabit Ethernet ports in a rack-dense 1U form factor. Here are a couple White pages about the different devices. www.andovercg.com/.../dell-powerconnect-3300-switches.pdf www.dell.com/.../pwcnt_3500_spec.pdf The biggest difference is going to be the switching capacity. 3500 - switching capacities of up to 12.8 Gbps (3524 and 3524P) and 17.6 Gbps (3548 and 3548P) 3300 - Switching Capacity 8.8 Gbps Switching Capacity 13.6 Gbps Forwarding Rate 6.5 Mpps Forwarding Rate 10.1 Mpps 3500 Introduction Dell™ PowerConnect™ 3524/3548 and PowerConnect 3524P/3548P are stackable, advanced multi-layer devices. PowerConnect units can function either as stand-alone, multi-layer, switching devices or stackable devices with up to eight stacking members. System Description PowerConnect 3524/3548 and PowerConnect 3524P/3548P combine versatility with minimal management. The PowerConnect 3524 and 3548 series include the following device types: • PowerConnect 3524 • PowerConnect 3524P • PowerConnect 3548 • PowerConnect 3548P PowerConnect 3524 The PowerConnect 3524 provides 24 10/100Mbps ports plus two SFP ports, and two Copper ports which can be used to forward traffic in a stand-alone device, or as stacking ports when the device is stacked. The device also provides one RS-232 console port. The PowerConnect 3524 is a stackable device, but also operates as a stand-alone device. PowerConnect 3524P The PowerConnect 3524P provides 24 10/100Mbps ports plus two SFP ports, and two Copper ports which can be used to forward traffic in a stand-alone device, or as stacking ports when the device is stacked. The device also provides one RS-232 console port. The PowerConnect 3524P is a stackable device, but also operates as a stand-alone device. The PowerConnect 3524P also provides Power over Ethernet (PoE).
What's the difference between the 3300 and 3500 series PowerConnects? 
PowerConnect 3300 vs 3500 series