Speaking of Grex 1200...
I think that you do need a revision 2 card in order to get 100% stable operation. Since that big argument that we've had with LordSpider a while ago, I've had an opportunity to test several "working" rev 0 cards with Grex1200 and although they seemingly worked, every once in a while a crash would occur. Some were more tolerant than others, but all would produce crashes eventually.
A simple swap to a rev 2 card would make the crashes dissapear. I now understand why DCE suggested revision 2 cards, as even the "working" rev 0s weren't really reliable.