I have a pair of corsair XMS 2gb DDR2 800 sticks which I have been running at the motherboard default timings and default voltage of 5-5-5-15 and 1.8v.
The RAM sticks are rated 4-4-4-12 @ 2.1v. I have been using them at the default speeds/voltage for about 18 months with no problems. I went through some computer problems whereby my cpu would constantly reboot with no BSOD. I ran memtest+ and one of the sticks showed errors. Even though the sticks are identical, would improper timings cause the RAM stick to fail memtest even though one passed and the other failed? Or, with these sticks it should'nt matter and leave the RAM stick out?
RAM timings could cause memtest to show errors as well as improper voltage. Increase the voltage to 2.1v and run memtest again. The DIMM may turn out bad, but try running it with the proper Mfg. rated voltage.
Looser timings won't cause the RAM to fail. If you were using the RAM for 18 months at 1.8V then you probably have a bad stick. For fun raise the voltage to 2.1V, or whatever they call out, and test the stick again. If it runs then let it eat, it is probably bad though.