first find out what make and model number your ram sticks are by using
cpu-z / memory tab
http://www.cpuid.com/cpuz.php
then look up the specs for your memory sticks to make sure they can handle increased volts like up to 2.1 volts
if they can / then bump your vdimm voltage (memory voltage) to 2.0 or 2.1 volts and try the stress test again