Firstly, thank you for your answer. It really seems a problem without solution as I have tried almost everything (no faith here I think

). Anyway, one set of settings that I have tried was this one:
MIT (Motherboard Intelligent Tweaker)
Robust Graphics Booster Auto
CPU Clock Ratio 9x
CPU Frequency 3.00GHz (333x9)
CPU Host Clock Control Enabled
PCI Express Frequency Auto
CIA 2 Disabled
Performance Enhanced with: Standard
System Memory Multiplier (SPD) Auto (or 1:1, 3:2 etc.)
DRAM Timing Selectable (SPD) Auto (Or Manual - I have tried both)
** standard timing control **
CAS Latency Time 5 Auto
DRAM RAS# to CAS# Delay 5 Auto
DRAM RAS# Precharge 5 Auto
Precharge delay (tRAS) 15 Auto
** advanced timing control **
ACT to ACT Delay (tRRD) 3 Auto
Rank Write to READ Delay 3 Auto
Write to Precharge Delay 5 Auto
Refresh to ACT Delay 36 0
Read to Precharge Delay 3 Auto
Static tRead Value 3 Auto
Static tRead Phase Adjust 0 Auto
Command Rate (CMD) 2 Auto
** Clock Driving & Skew Control **
CPU/PCIEX Clock Driving Control 800mV
CPU Clock Skew Control Normal
(G)MCH Clock Skew Control Normal
System Voltage Control Auto
DDR2 OverVoltage Control Normal
PCI-E OverVoltage Control Normal
FSB OverVoltage Control Normal
(G)MCH OverVoltage Control Normal
MCH Reference Voltage Control Normal
DDR Reference Voltage Control Normal
DDR Termination Voltage Control Normal
CPU Voltage Control xxxxxxx
Normal CPU Vcore 1.3 volt
I have also disabled as you can see in my first post eist, enhanced halt and similar settings. The thing is that at stock timings and settings I have no prob;em with my system. My best regards! Hoping for a help!
