GazJ

why are you fixating on cfm? by that logic your gonna end up buying a 3000 rpm fan cos its got high cfm its a psu fan not a case fan theres only so much air can pass through it plus higher the cfm the louder the fan usually

platnium psu not worth the upgrade stick with the gold and use the money else where the only difference is the 1-3% power loss due to efficiency its not a more solid psu its just in terms most on here wil get its a better binned part.
Would you buy a new mustang the same spec as the one you own same everything color spec year mileage and so on the only differnce is yours gets 12 to the gallon and the new one gets 13 to the gallon

im sorry to break it like that bro i really wish hp, dell, lenovo and a few others would just use the NORMAL standard

if you bought it in america im sorry to say the rx 550 is the most you can hope for as they only use 180 or 310 watt psu's  if your in 220v country its 250 watts the max card i would use would be a gtx 1650 its only 75 watt!