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well i went here http://www.jscustompcs.com/power_supply/ and right know im only using 210 watts with my current graphics card.. and with the 9800 pro im using 234 watts so i have 16 watts to spare, but you also have to remember that the site only shows the wattage for PEAK wattage usage
"The total amount this calculator figures is for all devices running at peak utilization. It is important to bear in mind that this amount will never be reached under typical operation"
My GF just built a SFF MSI machine w/ a 7200RPM drive, CD-DVD combo, 3ghz P4, and 9800Pro. The MSI barebones kit she used (Mega 865) came w/ a 200w PSU and it woks great through hours of gaming and is never turned off, so I would say that yes, a good quality 250w PSU can power a 9800Pro. Now, you said it was a Dell PSU but I'm assuming that Dell does not actually makee PSUs, instead they hire some other company to do it for them. The trick will be figuring out what kind of PSU it REALLY is and trying to guess form there....