enamak :
Did with stock for 1 hour went fine (1 hour is small time but since i got errors at 5 mins (at 1600MHz) now must bê fine.
How can i overclock to 1600 safelly? Or should i use cl8 1333
well, the thing to remember about OC'ing, is to make sure it's stable
You start OC'ing low, and work up in increments, testing along the way to ensure it's stable. It's time consuming. It can be worth the effort. I have a an older system OC'ed and the benefit is huge. But to just OC ram, isn't going to be much benefit to you at all.
Ram is funny, you can have fast speeds, but higher latencies, or slower speeds with small latencies. If your CPU is running at 1333 or equivalent, it's absolutely no benefit to you (or at least practically no benefit) to OC just the ram. Your CPU/system, simply won't avail of the OC.
If overclocking, always read about your CPU/Mobo/Ram combination. Put all three in a google search and add 'guide' and you will get some info on how to OC safely, and with stability. You will need to do some work here to be confident when doing it.