HP Envy h8-1410 power supply upgrade?

[Kilmah]

Hey guys so my brother was wondering if it's possible to upgrade his computer with a better graphics card. After I checked the insides of the computer I came to the conclusion that he should be able to upgrade the GPU if he gets a new power supply too. The problem is that I'm not sure if a standard power supply (The one we're thinking of getting is the Seasonic G series SSR-550RM) could fit into it. I don't have any experience with OEM computers as I tend to build my own. If the wonderful Tom's Hardware community could help me out with this problem then it would be much appreciated.
Just to be clear the computer we're are talking about is the HP-Envy h8-1410.

 

[laviniuc]

http://www.tomshardware.co.uk/forum/id-2098900/envy-series-desktops-kinds-graphics-card-upgrades.html normal size psu, no worries,

i'm a bit concerned about the ram modules placement, may not have enough room for the pci ex cards to fit properly... or you need to place the graphics after the ram is in http://www.ascendtech.us/mmASC/Images/69639900202.JPG

 

[C12Friedman]

The HP Envy H8-1410 uses a standard ATX size PSU so I would think the SeaSonic would be a good replacement option