Can't overclock Q8200 more than 2,778Ghz

Hi all,

This is my first time overclocking my CPU. Before starting, I have read a lot of information about overclocking in general, and specially how to overclock my CPU (Q8200).

My motherboard, is one ASRock G31M-GS (DDR2 RAM). Ok, lets see if I can explain propperly: I can go bumping my CPU FSB into 402Mhz, with 7 multiplier. Voltages, DRAM frequency etc, all is on AUTO. EIST and CIE, both disabled.

Ok, when I'm trying with 403Mhz, I got this error when booting:

Reboot and select proper boot device or insert boot media in selected boot device and press a key.

After that, I try to put my VTT into 1.3v, DRAM voltage into 2.000... but anyways, I only can reach my 402Mhz on FSB (this is, 2,778 Ghz Core speed)

My DRAM frequency only shows me 2 options: 402Mhz and 484Mhz.

Here you have, two pictures from my CPU info and my Memories:




By the way, I run this very stable. I have read on a lot of posts/guides, that with this CPU I can reach at least 3.0Ghz.

Anyone can help me with this? Why I can't put more than 402Mhz in my CPU frecuency with this VTT?

Thanks in advance.