Just to give you a data point on overclocking via the bios (which I
recommend vs some windows utility), here are my overclocked settings on a
1090T x6, on a 890GX motherboard, which it's been at for over a year now. I
used the same settings on my x4 cpu previously.

240mhz fsb
x17 multiplier = 4080mhz
x11 northbridge mult
x10 HT mult
memory x6.66 mult at 8-8-8-24 1T (corsair 1600mhz dominators)
cpu core volts 1.475v, associated chipset voltages raised also.

This is a quite high core voltage, and you must stay well below this in a
stock heatsink system. Mine is a highend Noctua NH-D14 with 2 higherspeed
fans on it, but still air-cooled.

The core & northbridge voltage (within bounds of course) is the primary
determinant of how far the cpu itself can oc, and when you raise them
temperatures go up. You *must* closely monitor temperatures when doing
stability testing, using a motherboard utility. Keep both cpu & system
temps below a max-stressed *peak* of around 55C. Your bios should have a
'Health' menu where you can force shutdown at a given temp; set this to
about 60C. When testing, if you notice temps still rising at the end of the
test run, back off the voltages a notch and set your sights lower. This is
especially important when gaming for long periods, as the videocard
temperature will rise dramatically as well as the cpu.

Overclocking SOP is to set fsb & mult as high as possible for a given core
voltage, while keeping the memory within it's stated specs by adjusting the
memory mult & fsb, then run Prime95 on all cores until it fails or gets too
hot. If it gets too hot you must decrease voltages or increase cooling. If
it fails you can bump voltages or change clock settings. Which clock
settings to change is the fun part

Try both, and feel free to play around with settings. You can't 'break' the
cpu with too high clock settings. You *can* break it with extreme voltage
settings or high temps, so monitor these carefully. I suggest booting off a
secondary 'trash' hard drive, not your main hard drive, until it's stable.

BTW, you should verify that Windows sees all 6 cores by entering Task
Manager, Performance tab, and check that it shows 6 cpu graphs. If it does
not, there's a simple procedure to fix that.

rms