Ok, having had to deal with the fun of ECC and nonECC motherboards for a while now, generally I tend to find:
1) ECC is dependent on the memory controller in the CPU for any of the AM2/3 motherboards.
2) If the motherboard specifies Registered ECC DIMMs (RDIMMS), those are the only ones that will work and Registered ECC modules are required along with a CPU to support them (Opteron series).
3) If the motherboard specifies Unbuffered ECC DIMMs (UDIMMS), then you can use either ECC, or non-ECC UDIMMs, and if CPU supports ECC (Opteron series) then it will use ECC -if- the motherboard has ECC UDIMMs in it. If it doesn't have ECC UDIMMs, then it will ignore ECC and fall back to non-ECC operation.
4) The motherboard you have spec'd above...