GPU Upgrade Help! (For OEM PC)

[FTC Gaming]

I would like to know if my hp pavilion p6-2422el is capable of a graphics card upgrade to a gtx750 or 750ti. The current one is gt 630. The amperages of the PSU are 12a and 16a on the 12v rails. The wattage is listed as 300w. I recently used a psu calculator and the  total wattage required is under the PSU wattage but im particularly worried about the amperage that it says it needs to be 18a. Pic of the PSU http/imgur.com/6Rcdzrr

PS. I'm new idk if i posted in the right category.

 

[ffg7]

this link says 300 watts http/www.geforce.com/hardware/desktop-gpus/geforce-gtx-750-ti/specifications but you might want to think on replacing that psu.
http/h20564.www2.hp.com/hpsc/doc/public/display?docId=c03645579