I just looked inside my dell and seen my hard drive at the bottom where my gtx 260 is my question can i move my hard drive to the empty slot at the top for future video card upgrades like Radeon HD 5970 or 5870?
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Yup, shouldn't be an issue. Just make sure that the power and SATA cables don't come loose when you move it. Otherwise, there really shouldn't be anything preventing you from moving it.