Other than the 500 having 32MB of RAM, and the 520 having 64MB of RAM, what are the actual differences? They both have an 8.8Gbps backplane, SRR QoS, 802.1x, CCA support, 32 VLANs, 8000 entry MAC table, 6 ether-channels, RSTP/STP, SSL encrypted managment traffic, SNMPv3, and 802.1q trunking.
Am I missing something?