Physically the sockets are compatible.
If the older 4800+ worked fine than you should update the BIOS on that motherboard when you have the 4800+ installed. A new BIOS revision may be needed to support that processor. They should have them on the ECS website. If there are no new BIOS revisions that support that processor than you will have to get a newer motherboard
Is your motherboard the revision 2.0 board you listed? The newest BIOS on their site is version: 09/01/05, released: 2009/01/13.
Just so you know that CPU isn't under the supported CPU list for that board (revision 2.0)