Got it!! it was not under any "memory divider" menu, but as soon as i changed memory settings to "manual" the "memclock" divider appeared.
I have tweaked with it, HTT at 4x and i upped the CPU voltage a little bit like you said and this is what i have got: Prime 95 torture test running for one hour without errors!!!
I had to stop the test to do other stuff, though.
Mem voltage is still on "AUTO".
Both pics at idle in XP
Forgot to take some pics after Prime95.
System is stable. Could i push the FSB to reach again DDR400 at the timmings i am using (2-3-2-5-1T)? Do i really have room to push more??
Thx for all the tips, dudes.