Is that a laptop? Had a problem trying to find your computer.
Either way, I don't think that oc'ing a Dell is going to happen. These aren't computers made for oc'ing. The motherboard is pretty generic.
If you want more help, I'd advise posting in the general technology area. You'll find lots of help on a new build or how to upgrade your current one.
Corsair AX 1200w-|-ASUS Crosshair IV-|-AMD 1090T/Thermax Spire Eclipse II
G.SKILL Flare 4GB DDR3 1840 CL6-|-WD Black 500G X2 RAID 0
WD Black 1T SATA 6GB/s-|-2x HD6870 Cross Fire-|-case MM Ascension
Samsung P2350-1 23"-|-Logitech G15 keyboard-|-Logitech G9x mouse/SteelSeries Experience I-2