Would this juice a 9800GT Eco?

http://www.newegg.com/Product/Product.aspx?Item=N82E168...

Hi fellas. I was just wondering if this 300W would juice a 9800GT Eco (uses less then 70W's) along side a Q8200 and 4GB DDR2 (2x2GB,) The motherboard in question is a Gigabyte G31.

I'm building a custom case for a friend, he wants it to be the same size as the Xbox 360, so far everythings in apart from a custom PSU. There are a few, but my concern is if it will power it or not. Someone suggested in another thread that my 305W Dell PSU would be fine with this GPU...

Any ideas?