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Thread Starter 
Hi everybody.

I am new to this forum ...

I have an Intel DZ77GA-70k MOBO with an I7 3770K CPU , 8 GB of RAM Corsair Vengeance 1600MHZ..
I also have a 750W corsair bronze PSU..

My problem is as follows...
I tried overclocking my cpu from 3.9 GHZ to 4.5GHZ ... also tried in between ...
most of the time when I switch on my system I get a 3 beep error indicating a memory problem ... at first I thought I had faulty ram
so the store replaced it ... I also tried my friends Kingston hyperX memory, still does it ...
now when I unplug the system from the AC, wait about 15 seconds and plug it back in ... it boots up fine, works great, doesn't crash and also the stress tests work great ...
if I overclock to 4.0 GHZ everything works ....
the memory profile that I use is the XMP profile ...
I don't know if I need to change the memory timings ... some other settings... I have the latest bios (60) ...
can anyone guess what might the problem be ?

thanks!