alot of things tie into how stable your system is on an overclock. it could be North and South Bridge voltages, it could be your RAM timings, it could be FSB, it could be RAM failure over time.
My old Gskill HZ memory failed me after about a year.
ID start with RAM timings first.. loosen em up and see how that is. if that doesnt work play with the FSBx Multiplier a bit.. See if its better at the same speed with lower FSB x Higher Multiplier. Then if you feel comfortable you can try raising the voltages applied to the RAM and Bridges and CPU
hope this helps you get an idea
My old Gskill HZ memory failed me after about a year.
ID start with RAM timings first.. loosen em up and see how that is. if that doesnt work play with the FSBx Multiplier a bit.. See if its better at the same speed with lower FSB x Higher Multiplier. Then if you feel comfortable you can try raising the voltages applied to the RAM and Bridges and CPU
hope this helps you get an idea