I have a friend in Greece that subjects his ddr to this before continuing any overclocking venture, he has been pretty successful at maxing out P4 systems to date---
Do it when you first purchase your mem if you are maximizing performance---
(Remove heat spreaders for best result, *voiding warranty*)
Boot--goto bios, select default vmem w/highest timing
Run Super Pi (1mb) and Memtest and find/set max faultfree frequency
Restart, run Sandra mem burn @ high priority/high cpu load/100 times
Restart run 3DMark 2001/check all benchmarks except "image" run 10 times w/no titles at options
Reboot to bios and select highest Vmem voltage (2.9 max)
Reboot
Run Super Pi and Memtest again finding your 100% faultfree freq
reset and reboot
Now do it again BUT:
Run Sandra mem burn 100X and 3DMark 200X
Reboot to bios and pick slowest timings with the maximum voltage available (2.9--->NOT more then 3.2v if available)
Reboot and run 1MB Super Pi and Memtest again along w/200 cycles of 3DMark and Sandra mem burn finding max faultfree
Select your best mem timing with highest voltage then put your spreaders back on w/the clips+/frag tape/ASIII/AS adhesive/or AS3 etc and teeny drops of CA glue etc and go forth with your overclocking project
For example final result on Corsair XMS3200 C2--- when mem was unburnt in it ran at 434ddr and after burning in ran at 494ddr...
Takes awhile to go thru this procedure but it may be worth it---