To get to only 4Ghz though, you should really only need to give it a 40x multiplier and that's basically it. It should be able to do that on stock volts (or even undervolted slightly, if you're lucky).
strange thing happenned, i turned on my pc today to see that my cpu is running at 3.3, stock speed...
i changed the clock ratio back to 40x . but does this happen ? cpus going back to stock speeds, cause when i entered bios it showed the clock ratio at 33.. lol
It IS strange that it would drop the multiplier back down like it did, but yes that wattage is OK. It CAN be much higher, of course with more voltage, but I'm guessing that you're running with a relatively low voltage right now, so it's not out of the question at all.