dc 5800 sff case with an hd 7750 low profile gpu?

Marlon Jaramillo

Honorable
Oct 4, 2013
1
0
10,510
ok i need kinda profesional help !.
well this is my problem i just upgraded my ram to 4gigs and i was like i need a new gpu i find out the hd 7750 low profile this one :http://www.amazon.com/Sapphire-100357LP-128-bit-Express-Profile/dp/B0095MRLJ2/ref=sr_1_1?ie=UTF8&qid=1380913988&sr=8-1&keywords=hd+7750+low+profile
then in the corner of the picture it says something like ''400w psu is needed'' and my pc only have 240w psu
i was kinda dissapointed with my pc , then i see the customer reviews and 1 dude posted something like ''oh yea it works fine with my 240w psu''' then i started with my research and i find out that my psu maybe could handle it , then i used the nweeg watts calculator and the resullt at full load was something like 230w thats my question should i buy the gpu this is my pc http://h10010.www1.hp.com/wwpc/ca/en/sm/WF06b/12132708-12132884-12132884-12132884-81559927-81560059-81804780.html?dnr=2