Your using the RB333 and only getting 20mbit? Something must be wrong then.. If you're not doing NAT or using any firewall rules on the RB make sure that connection tracking is turned off. Connection tracking wastes a lot of cpu power if you're not using it.
To answer your original question, Yes that motherboard looks like it should work just fine..
i do a bandwith test with a computer on each side of the wireless link. i am using 2 rb532. i also am trying to use ospf to do a full duplex link. i get 10 mbps. and the cpu load is at 100% so i was thinking that i need a board with a bigger cpu to handle the load. any advice??
Im not saying the r532 is bad i have been using them for a while and have alot of them i am just trying to get my backhaul conections faster and cant seam to do it with the RB532's
That sounds like the same link i have but i am using rb532 and i am getting 10 mb full duplex but my cpu load is at 100% during a bandwith test so i think you should get better with the 333 they are a faster cpu the routerboards that i have are the older 532 and running at 264 mhz.
I am waiting for the RB600 to be released!! still havent been able to get a release date!