I have been pushing 1.3v through the VDDSOC for the past week or so to keep >3600 stable on my -b's. I have tested as high as 3800 with 0702, I was unable to keep those speeds with 1001/0038. I have not seen any noticeable degradation of the IMC. The chip itself seems to be good for ram, the other one I was testing with wouldn't push the same ram over 3300 regardless of voltages.