Broadcom Teaming Query (LACP/802.3ad)

I'm not entirely sure whether to post this in this forum or the Poweredge one, but I'm working on the principle that more Network experts are likely to be reading here as it's specific to Network kit.

We have a 2950 III with a pair of BCM5708 NICs.

Our core switch is a Cisco 4507 on which we have (to the best of our knowledge) configured LACP and trunking on a pair of ports.

When we go through the Broadcom Team Wizard we can create an LACP/802.3ad team from the 2 NICs and we have connectivity.  However the virtual NIC that is created in Control Panel/Networks "only" shows a link speed of 1gbps when I would expect it to show 2gbps?

I understand that no one conversation can span the NICs but at the moment I'm unsure if things are actually configured correctly or not - people on Cisco forums say the switch config is spot on and I'm unsure what to expect the Broadcom software/NIC properties to show within Windows (Server 2003 R2).

I'd appreciate any input.