@vot
yeah, C2Ds hard limit the multiplier to be able to sell similar dies at different speeds. There's a way of getting rid of it, but I wouldn't do it as it completely voids your warranty.
Use CPU-Z to check what voltage your core runs at on auto, then try stepping up the voltage for Vcore, NB Voltage and FSB. However I would suggest to NOT DO THIS UNLESS YOU HAVE AN AFTERMARKET HEATSINK ON NORTHBRIDGE.
However, you should be happily able to play with RAM timings. The ratio thing is a clock synchronous technique. The idea is that the RAM timings with the FSB, if at an even ratio (small ratio) would allow for easier transfer of information on the clock signals (basically). Ie, in a 1.1 ratio, for every 1 clock cycle, the FSB and RAM are calculating evenly. For a 3:4 ratio, for every 3x4 clock cycles, 12, the ram and fsb are sync'd. ie, get your ratio down for better bandwidth. P5N-E has a good BIOS setup for this, under the FSB and MEM submenu.
Timings are looser at higher MHz. Ie, a PC6400 running at 667MHz can have timings of 4-3-3-8, whereas at 1000MHz, 5-5-5-12 is a good timing. however, the 667 may end up being better bandwidth than 4-4-4-8@800 or thereabouts, its a matter of trial and error, and making sure that you keep an eye on the temperatures of your ram (hopefully your ram has a heatsink on it as well). What sort of ram do you have?
the North bridge mod is kinda important when overclocking this board. It, at stock, gets really hot anyway, so anything higher than 1066 or 1333 is bound to cause problems. Southbridge is less common to mod, as it only runs PCI-E 1x and other peripheral controllers. NB runs Graphics cards (PCI-E 16x) and Memory and CPU, so it's the nerve centre. However, I'm not an expert on either, so if anybody else wants to swing in, please do!
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