yes, it will work as long as motherboard has a free pci-e slot and psu a spare molex connector. i'm not sure how is it with dell, but with some companies you void a warranty by opening a case.
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Foobar2k(ASIO) -> Asus Xonar Essence STX (2xLME49720HA i/v + LM6172 buffer) -> AKG K701
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