That information is not correct. (550W)
The GTX 275 consumes ~215W in the NVIDIA reference design - pre-overclocked versions might consume a bit more.
I've never heard of your PSU, so it prolly is a cheap one. Make sure the PSU has atleast 2x 6pin slots.
PS: Why would you want to upgrade from the HD 4850 to the GTX 275 ? Trust me, the performance increase isnt that big as it would be worth to spend 180€ on it.
IF you want to upgrade your card, get an HD 5870 or wait another 4-6 weeks till NVIDIA launches their new GT300 series.
The GTX 275 consumes ~215W in the NVIDIA reference design - pre-overclocked versions might consume a bit more.
I've never heard of your PSU, so it prolly is a cheap one. Make sure the PSU has atleast 2x 6pin slots.
PS: Why would you want to upgrade from the HD 4850 to the GTX 275 ? Trust me, the performance increase isnt that big as it would be worth to spend 180€ on it.
IF you want to upgrade your card, get an HD 5870 or wait another 4-6 weeks till NVIDIA launches their new GT300 series.