It should work, especially if it's unbuffered. Ecc will run in many boards, but registered ram may not. Try it before ordering any more ram. I'm using mac pro ram in my desktop board mixed with regular 1066 non ecc ram. The mac pro ram is rated at 1098, but it will also run at 1066.
I can confirm that I use 24GB ECC hynix PC2-10600R on sabertooth X58. It works perfectly
with Xeon E5520!!