Seems like I got lucky with my two from Batch 6.
One is running stable 500+ gh/s at 250 freq. (46c, 45c)
The other stable at 490+ gh/s at 243.75 freq. Above that this one gets one chip X'd out. (44c, 45c)
Should I consider re-applying thermal paste on these to bring temps down or consider myself lucky and leave it alone?
How long are you running at before you consider them stable? How are the errors? Have you tried using different power connectors or perhaps 2 on the malfunctioning blade? They seem to act up in the first 8 hours and still don't hash consistently between reboots..one boot is fine, the next errors and rejects

I tried other freq's yesterdy (225, 237.5, 250) for 2-3 hours each. With the current settings they've been running for about 7.5 hours.
HW errors are low, 19 and 11. I have all 4 power ports used currently on each so no I haven't tried moving any connectors yet.
I'll keep an eye on it for today, hopefully they will stay stable.