yes you can, but dell is shit so if you try to overclock it, it'll crash
dell uses the shittiest memory, shittiest power supply, shitty other stuff, shitty shit, the other non-shitty stuff they HAVE are their monitors and PDA's, but then again, samsung oems for their monitors and HTPC oems for their PDA's and basically dell is shitty
oh, and no, you don't want to OC it