is my memory bad?

[Clockwerk]

So when I added 2 gigs of OCZ Plat rev2 (4x512mb) to my system it defaulted to 333mhz, I went into the bios and changed it to 400mhz which is what it should run at, I didnt adjust the timing and before it was set to auto, now its set to manual and all i adjusted was the mhz.. Now it crashes after an hour or so of playing a game or other memory intensive program, its just locks up or automatically reboots itself. It still does it when its at 333mhz but only after my system has been running for a day or more..

Do I need to adjust all the timings or does it sounds like some of my memory is bad? My rig specs should be in my sig, heh..

 

[Clockwerk]

eh? not enough info? I would appreciate some help

 

[mwmorph]

update motherboard bios, chipset drivers. Also do you have 4 sticks of ram now or what?

 

[Clockwerk]

Thanks for responding..

Yes, 4x512, I have updated all my drivers recently and rolled them back to no avail. Also, when I set it to 400mhz its seems when I switch from lets say a minimized folder to my media player the system pause temporarily.