hows this for odd ..... one of my duff ones is now hashing .... instead of the 2Gh/s, it making 1Gh/s 
i have no idea how it happened, but i have moved that rig today(but i never unplugged any ants), so that *may* have helped
one off them i have voided the warranty (well both if you consider the minor over clock to 0981), i tried the resister upgrade, but it made no difference, on that one i was considering trying something similar to the "YLOD PS3 fix" (no clean flux and some "monitored" heat).
i have no idea how it happened, but i have moved that rig today(but i never unplugged any ants), so that *may* have helped one off them i have voided the warranty (well both if you consider the minor over clock to 0981), i tried the resister upgrade, but it made no difference, on that one i was considering trying something similar to the "YLOD PS3 fix" (no clean flux and some "monitored" heat).