need help OCing a Gigabyte board

[ekuest]

i have a mini-ITX H55n-USB3 and an i7-860. i have had almost no luck overclocking it so far, and am not sure why. i was hoping for a 3.5GHz prime stable overclock, but cant seem to get much past 3.0. i know people have done 4GHz stable on air on dual core CPUs with this board, am i really going to be so much more limited with this quad core processor, or am i doing something wrong? i am completely unfamiliar with the gigabyte bios, and would like some pointers from someone either with an H55n or just experience with any recent gigabyte board. thanks!

 

[ekuest]

details after some overclocking attempts:

im using an H50 with the fan set to 100%. maximum i've achieved stable is 155x22=3.41GHz. 160 booted fine and ran prime for one pass, but then froze. my ram is a set of dominators rated at 9-9-9-24 at1.8V, but they default to 7-7-7-20 at 1.5V in the bios, and run great at those settings. i have not touched anything else so far other than setting the dram to 1.5V, which is what it defaulted to, and upping the multi to max and the bclk to 155. everything else is on auto or default. so what can i do to get a little higher clock? i was shooting for 3.5+, so maybe i will just have to call 3.4 good enough and move on. any suggestions? ive tried upping vcore and other voltages and using higher bclk/lower multi but nothing has been stable at 3.4 except for just leaving everything on auto. :/

also, at current 3.4GHz settings, temps max out at 68C, and i have active cooling on the south bridge, so im not sure whats holding my OC back. i assume its some voltage.