Well if I was you I would leave the stick somewhere cool for 24 hours, then reflash the bios to 510-2 615 618-2 623-2.

Or load default settting with good stick enter bios up Vdimm, Load into windows then shut down. Dont unplug power cord put the other stick in see if it boots.

I have a strong feeling that 90% of so called dead sticks is infact the board ie "so called cold boot"