Dell Vostro 430 Graphics Card Upgrade

Hi, I have a question about the changing my video card in my old (well not that old) discountinued Vostro 430. It has a PSU of 350 but I bought a GeForce GTX 650 (because who reads instructions?!?) which says it requires a PSU of 400. Can I get away with using a 350 for a while until I buy a 400 PSU in a month or two from now or would I end up frying my card? 

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