After a year of problems with these sticks they finally died on me.
Have never ever been able to track them down, nether on corsairs support site, over the phone, nothing.
CM2X512-8500
XMS8505v1.1
413010 0643195-2
5-5-5-12
1066mhz
512MB
XMS2-8500
Probably the last corsair memory I buy having been sold one that doesn't see to exist