No, They always use custom BIOSes that do not allow overclocking, especially now that they have a PC where one of its main selling points is overclocking, theres no way they are gonna let you do it.
HOWEVER, sometimes it turns out that you can flash the BIOS on the motherboard with a retail BIOS of whatever modified board it originally was. Which gets you overclocking :P I wouldn't count on it though.
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X38 Chipset according to Dell.com! Cool! Can it be overclocked tho???
No, They always use custom BIOSes that do not allow overclocking, especially now that they have a PC where one of its main selling points is overclocking, theres no way they are gonna let you do it.
HOWEVER, sometimes it turns out that you can flash the BIOS on the motherboard with a retail BIOS of whatever modified board it originally was. Which gets you overclocking :P I wouldn't count on it though.