nehalem

Hi all I am wanting to add 2 x 10G ports to my workstation and server. My question is: is there any potential difference, positive or negative, between doing this via one dual-port card (in my case, X520-DA2) versus 2 x single-port card (X520-DA1.) The cards will go in PCIE 2.0 x8 slots, so...

Looking to reduce the power consumption of my homelab which runs around 700-1000W per annum and costs about £900-1200 in electricity. I have a pair of Supermicro Xeon E5540 SuperServers with 96GB DDR3, 4x 900GB SAS 2.5" drives. They run vSphere 6.0, and host Zimbra, Zabbix, Plex, Nakivo, etc...