Thats true 1000 does req the voltage mod but I think at 850 they are very stable. Stock they are set to 700 I think so even the bump to 850 would be nice and I am getting zero errors @ 850 on my local miners with the fans off.
Can confirm, I'm running a bunch locally @ 850 for about two weeks already stable no issues that I can see (I just periodically check hashrate at the pool I use). I still haven't gotten to disconnecting fans though.
BTW, received single Gridseeds I've ordered from GAW (my earlier order was from another vendor) and they include USB cable (expected) and also power supplies, not just pigtails that need to be spliced (unexpected!). Thanks GAW Miners!