First off, I would like to say that I did make some reasearch but I have found nothing else than stats/cpu-z screenshots wich are not really helping even tho they are nice..
The problem :
I bought my current computer last christmas. I spent many bucks on an air cooling system wich includes 5x 120mm fans and 1x Xygmatek 3 heatsink.
I am also using the Ep45-DS3L motherboard, 750W corsair PSU and, of course, the e5200 cpu. The thing is... I cant push that sucker to more than 3.25Ghz wich is deceiving...I would like my CPU to overclock AT LEAST @ 3.5Ghz.
My BIOS options
BIOS version is F9
First, all my BIOS setting are "Optimisez default" besides thoses options
Limit CPUID MAx [Disabled]
CPU HALT [Disabled]
C2/C2E State [Disabled]
xC4/C4E State [Disabled]
CPU Thermal [Enabled]
CPU EIST [Disabled]
I read many, many posts here and everytime, it said that w/o thoses options it was impossible to overclock.
Other than that, in the M.I.T. tweak, I have the following options
This is the best overclock I ever reached. Even going 3.26 dosnt work.
CPU Clock Ration 
Fine CPU Clocl Ration [+0.5]
CPU Frequency 3.25 (260x12.5)
VCORE 1.18750V [Auto]
Termination 1.200V [Auto]
PLL 1.550V [Auto]
Reference 0.805V [Auto]
I figured that keeping the voltages @ auto would be the best thing to do. I tried fooling around with values around the default settings and it never worked.
21-26 degrees. 26 is the max I ever saw.
What I tried
I tried around 50 different frequencies. 350x10, 300x10, 280x11, etc, etc
Nothing worked else than anything bellow 260x12,5 (3.25ghz)
I also tried to change the Vcore voltage, I did not change any other voltages.
I tried went from 1.10V to 1.36V max.
When I try different frequencies/voltages settings, I hit "save and exit" then the computer shuts down for 2-3 flat seconds. I can then hear the fans of both my cpu heatsink and videocard start running, then I can heard everything else powering. My screen finds the video card signal but does not show anything. The screen keeps black for a few seconds then I hear a "click" and the computer restarts. The same whole thing starts over again. After the 2nd "click" the Cpu boots with normal setting, I can then go into the bios, theres a red screen saying that the values I selected were not stable and stuff. I can then change the values again back to 3.25 or stay at stock.
Im new to overclocking, well... I can OC a little bit but I never managed a big OC yet. I still bought pretty strong parts I believe.. Wich makes me wonder, maybe the problem is physical? Could it be that the cpu paste was applied the wrong way? Is the computer detecting the wrong temps? I really dont know..
What I would like
If anyone can show me what they did to overclock (what voltages, timings, well everything) with the same mobo/cpu than me to something equal or higher than 3.5ghz. Step by step.. or not... well any help would be really nice!
Maybe im just missing a little detail something. If anyone has any idea, or knows how to oc that sucker like I want to... would be much appreciated!
... Well... I'm going to sleep. Thanks for the help!