Minimum power supply ofr ATI 4770

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Jul 3, 2009
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I've only got a 375 watt power supply in my XPS 420. Can't really upgrade the power supply but want beter graphics than I get with my ATI 2400. I know 375 is below the recommended minimum for a 4770, but does anyone know if it will operate in this machine OR have recommendations for another upgrade card? Thanks.