Mismatched Ram Timing problem?

I have two sticks of 2GB 800 bus rams. One times 6-6-6-18 another 5-5-5-15.. now in order to run them, i have two options-

1. Run them both @ 5-5-5-15, but that will make them run at 667 MHz (my motherboard sets it auto,if not manually set otherwise)
or,
2. Run them at 6-6-6-18, downtiming one ram thats capable of running at 5-5-5-15 (currently running in this mode)

now, i need to know which is better in terms of stability?
the reason im asking this qus is i got some pc hangups (event logger says, kernel power error event 41) since i got windows 7 and these rams,and had to hard reboot(i was running XP and 2GB 800mhz before without any problems). Im a bit anxious about it..need to know whats causing it..Rams or the OS? one thing is common though, everytime(more or less) my pc hanged was sometime after waking up from a sleep mode..i have played games on my system plainly for hours after normal boot without problem. So ...long story short...what do u guys think is my problem? the Rams? timings? or the windows 7 x64?

Post your complete system spec's, including links to your specific RAM modules. Also post pic's of the SPD tab in CPU-Z showing the timings for each of the two modules at DDR2-800, and another open to the Memory tab showing current timings and FSB : DRAM ratio. You might also want to post another pic. w/ it open to the CPU tab, so we can see what the current FSB, multiplier, and core speed are.

its never a good idea to mix and match memory modules but i would say your best chance of survival would be to run them both at the 6-6-6 timings.

Ram timing problem, help please?

Okay..here is my problem. I have two sticks of DDR2 800 mhz (one with 6-6-6-18 timing, another with 5-5-5-15) rams with different timings. now im having some stability problems.



When running in dual channel mode, my mobo sets them automatically to-



The separate timings of my rams are-

ram-1 with 6-6-6-18, 800mhz



ram-2 with 5-5-5-15, 800mhz




please note that its causing some stability problem, and also has set my bus freq to 667mhz.
now what my common sense tells me is to run it in 6-6-6-18 in the standard timing section, and set 3-3-6-52-3-5 in the advanced timing, and set the mem freq to 800mhz manually(by changing the mem freq multiplier) in order to get better stability.and also what should i do with the last thing- "static tREAD phase adjust" i cant set it to zero, lowest i can get to is 1 while running in dual channel.

What do u think?

What are the voltage specs of both sets of RAM? You want to run both at a voltage they can handle. Running them at the loosest timings is your best bet as well.