Using bfgminer 2.10.5 for 2 weeks now without issues. Was using MPBM before because the x6500s had SICK/DEAD issues with older versions of bfgminer.

OCL 0 & 1 = 6870s (underclocked to 775/300)
OCL 2 = 5850 (overclocked to 960/300)
OCL 3 = 5670 (overclocked to 1000/300)
BFL = 864 firmware
XBS 0 - 3 = x6500 rev 3