Desperately Need to upgrade the PSU of my Inspiron 530s

OK, so I bought a Nvidia 9600 gt only to realize afterwards that the card requires a 400 watt power supply, and my computer only has 250 watts. After researching I learned the only power supplies that fit in the computer are 250 watt and 270 watt! What am I suppose to do? Can I get some sort of power supply that sits outside of my case? Or do I need a new case? If the latter, can anyone point me in the right direction of a larger case compatible with the inspiron 530s? Thanks in advance.

EDIT: Forgot to mention. I found this review on newegg of the card, and it says this:

"Whoops, forgot to mention in previous review, that 530S only has one spare SATA 5pin power connector. Had to buy SATA 5pin to 4pin MOLEX convertor and then a 4pin to 6pin convertor to power graphics card. Worked fine!"

Can someone translate this into english? This guy has my same computer so I need to figure out exactly what this guy bought so it will work.

visiontek makes an external psu for video cards. BUT, i have had a hell of a time finding one. go to their forums and ask around.

http://www.visiontek.com/forum/ind [...] 60565e34dd

next choice would be a new case and psu. It is probably a micro atx motherboard. if so, most cases will support it.

What makes you think a standard ATX power supply would be perfect for a slim line case ?

Um... delluser1, It sounded like he said he had 2 things in that comment, not just that adapter. Can you evaluate?

I see...and what would you recommend I do about the power supply problem?

Several things you can do.

1) Buy a Tower and a new PSU and mirgrate everything over.
2) Buy an ATX PSU and have it sit outside. Remove the 250W PSU and have the cable going thru the opening.
3) Sell you Dell and buy another computer.
4) Sell your Graphic Card.
5) Have a Korean or Japanese friend and order a 450W TFX PSU from Asia.
6) Buy a Seasonic 300W (some people claims it have sufficient power, I doubt it.)

My choice would be 1 or 5.

A bigger case and an ATX PSU would be best, especially with a 9600GT which consumes at least 95 watts,
but newegg has a seasonic 300W TFX which I wouldn't recommend unless you downgrade the GPU to a 9500GT. And, if you stay with the slim case, consider using an external ATX and installing a 60mm or maybe a 50mm fan where the old TFX outlet was, after of course removing it completely in favor of the ATX PSU(running wires through a fabricated opening in the case) and a fan.

The 9600 GT only consumes 60 watts of power
http://www.xbitlabs.com/articles/v [...] html#sect0


In response to lamprey as well,
The Dell 300 watt power supply has shown to be plenty for a 9600 GT, a higher quality Seasonic 300 watt unit would certainly be able to handle it.