How many nodes in the same PVE cluster with Unicast can i have?

Hi to all, in special to PVE developers team

I had read this link:
http://www.linkedin.com/groups/Proxm...95.S.188944434

And in this link Mr. Alejandro P. tell us about of his professional experince about of PVE Cluster with more of 8 Nodes that are working in Unicast mode (I translate to English part of the text):
"Yes, but it seems there is no problem, the drawback is the bandwidth, but I already have several clusters without multicast with more than 8 nodes
And it works perfectly on unicast."

Then, my question Million is:
How many nodes maximum in the same PVE cluster in Unicast mode configured can i have on my LAN? (Mr. Google don't help me)

Why this question:
1- Because if i have a PVE Cluster with more of four Nodes and managed switches, I should not worry of configure the Switches, even before buying them (a concern less, that it is my case)
2- Unicast generates less network traffic

Other important Note:
If it say Mr. Alejandro P. is correct, please correct the wiki of proxmox that say us about of Unicast "do not use it with more that 4 cluster nodes":
http://pve.proxmox.com/wiki/Multicast_notes.

Best regards
Cesar