wattage isnt always enough to tell you if you can run new video cards.
check the Amperages aswell
for example, on the +3.3V line, below that it should say 10A-35A or so... you want it 24A on the 3.3V or above to really get the full use of a new 6600gt or something similar
dell 4700 is probly 26A area... i have a 4600 and mines only 18 and 250watt. had to get a 6200
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