Temps shouldn't change much at all if you don't up the voltage on your chip, they've gotten lower because voltage stayed the same and you upped the speed on your fans. You may have gotten that increase in clock, but is it stable? Run SP2004 or orthos to test stability, a blend test should be fine and run it for 8+ hours.

Your actual memory frequency should be whatever the FSB is and multiply it by two. So your ram is DDR612 when your FSB is at 306.

Well on my intel cpu its a 3ghz cpu and i have had it at 3.6ghz stable and never had a problem with it, and thats still useing the stock cooler. But i do have  good air flow in my case also, and the 80mm fan that is on my side panel spins at 3000rpm and i leave it on high and have not had a problem with temp. I did build the computer myself so i get pretty good speeds out of it, i know i have had some friends that had but like gateways or dells, nad they had little or no way to oc there comp. When overclocking it depends on what the cpu can do and the motheraboard and the ram and the cooling you have. Like the 805 dc cpu intel made its a 2.66 cpu, and peoplegot it all the way up to 4.1ghz, it depneds on you parts and how far you can push them.

okay imma se if upping the voltage will keep me kosher. I am pretty sure that cooling won't be an issue cuz i have an aftermarket cpu fan thats massive with pipes for the heatsinks and all that jazz. This fan has a dedicated tube that takes this hot air directly out of the box. I also have a fatty fan spitting out all other heat out the back and draws in the cool air through the front via negative air pressure. In addition to these fans, i also have one on the GPU of course as well as the antec Vcool that brings in air to the GPU.

So... in summation
Fans out.
PSU, CPU, Main Case Fan
Fans In.
Antec GPU cooler
Extra fans.
GPU

So. should i up the voltage on all possible components of just to the CPU? and i have a bfg 8600 OC'd. should i up that voltage too? it is OC'd or whatever.

never up voltage suddenly. really when OCing you should never do more than one change at once and never change anything signifcantly unless you really know how your gear handles its shit or you like to live dangerously. my method is to figure out how high my memory speed will go, then bump CPU speed up as high as it will go stable (this may involve lowering memory speed from its max a bit), then bump voltage up in tiny increments until whatever CPU speed is unstable becomes stable (don't forget you can often bump voltage on the NB and/or SB). if heat isn't too bad I'll start the process again. once I've got my CPU maxed I move on to video card repeating the same thing, often it seems with video cards increasing memory speed gets better performance gains than increasing GPU speed, and voltage increases don't gain you much (at least in my experience, I don't usually spend a lot of time really pushing my GPU, I'm always happy to call it good when I've moved a mid-range GPU to the settings of the next product up in its line).
Voltage is the one thing you need to be REALLY careful with, it's really the only thing that will damage your gear so it's important that you bump it up in tiny amounts and don't take it too far. If I were you I would look up the specs on anything you want to overvolt and don't go too high above the rated voltage. Sometimes it's better to play it safe and not push things too hard just for that extra 2% performance gain that requires you to run way overvolted.