gmx00

Had another look, and you are spot on. Also makes sense I was not able to find anything about ProMos 4Gbit ICs out there. The 5 looks like a 6 at a glance however it has the same overall shap as the "5" in the voltage part of the label; "1.5V" Thank you, appreciate it. Eager to pop these in and give them a run!

5 yr bump incoming. Similar to the OP, I have 32GB mismatched kits of CMY16GX3M2A2133, one is v4.29 and the other v6.29. I assume the v4.xx is the same IC at a slightly higher bin than the OP has, since it's the same product line. I have not tried too much messing with the sub-timings. Currently I got to 10-12-11-x 1T @ DDR3-2400 or 9-11-11-x 1T @ DDR3-2200. Have just left the voltage at 1.64v for the time being and working on tightening DDR3-2200 CL9 timings (9-10-9-x). I'm tempted to try the v6.29 kit but I cannot find any clues on 4gbit ProMoS modules and their overclockability. Any advice?