If you find option for Load line calibration enable it, disable cpu spread spectrum and pcie spread spectrum. Disable intel vt-d and enable t-probe. in onboard devices menu you can disable onboard 1394 controller and serial port1 adddress if you dont use them for extra stability. in advanced cpu menu there is choice to still use C1E state and c-state if you want to (means your clocks drop lower when on idle state, i recommend to test these) i have both c1e and c-state disabled so im basically at 4+ghz all the time, with your cooling you might only enable c1e and disable c-state or keep both enabled. Hardware prefetcher = enable, adjacent cache line prefetch = enable, max cpuid value limit = disable, intel virtualization tech = disable, CPU TM function enable, execute disable but capability = enable, intel HT technology = enable ( this is multithreading make sure to leave enabled)
active processor cores = all , a20m = disable, intel speed step = disable.
You should see in same page either something called CPU ratio setting or ratio CMOS setting (this is your multiplier) so always use max multiplier you can get set it manually, it will probably be 19. Disable Intel turbo boost (intel turbomode tech).
Now check hardware monitor page for fan speeds, always set your cpu fan to 100% when under load there should be an option, this might lower your temperature but increase noise a bit.
Then to overclocking: first check with cpu-z and in the SPD tab what voltage are your ram supposed to have and also check part number what kinda timings and frequency it is rated for ( on this later). Somewhere there should be chipset options there should be option called dram frequency, you can change this from 1333 1600 1866 etc, thing is when you overclock raising your BLCK this also changes your DRAM frequency and if you go too high with low timings you cant boot up. Dont worry there is recover options in your motherboard, jumper / reset button etc. Read about these more on the manual for p7p55d m lx. If you have bad ram overclock you get black screeen or bsod just wait few minutes on black screen or press power button to close and then boot again it should have all settings reset in bios.
When you raise blck to from 133 to 160 example your dram frequency raises aswell, you then after raising blck need to go back to chipset settings to check what optionms you have for dram frequency, just stick close to 1333mhz so you see first what is your max blck you can hit.
Default voltage for PLL is 1.80v so you can set that manually, sometimes you need to raise it but i wouldnt bother since your not going over 4ghz, set dram voltage to 1.50v.
Now only voltages you need to tweak is IMC / vtt voltage and vcore, however i would not raise those too much with that cooling. You can bumb vcore offset voltage by +0.05v but not more before you thermal test and put IMC voltage to 1.175v. Be very careful when you change voltages.
You can first try changing blck to 160 and after doing it go chipset options to check what dram frequency options you have and choose lowest or nearest to 1333mhz or below. When your ratio CMOS setting is at 19 x 160 blck and intel turbo boost / turbo mode is off that means your effective clock would be 3040mhz test with that first and report back how temps etc goes after stress test with 100% fan load
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