mcginn09 :
MasterDell :
Since you live in the Uk, correct? This would be the best option:
http://uk.pcpartpicker.com/part/evga-power-supply-100b10500kr
Using that PSU would likely void the warranty with AMD/card manu. So although the XFX is of better quality, it would definitely not be the best option. The EVGA 500B is actually not that bad of a PSU anyway so it should be fine.
i would have gone out and gotten it but can't afford to upgrade psu right now which sucks would you suggest i just avoid the r9 and get a 750ti? yes im from the uk
The 750 Ti has the performance of a 260x. So no. I wouldn't say ditch the r9 yet. Have you taken a look at the r7 265?
http://uk.pcpartpicker.com/part/sapphire-video-card-112320020g
It performs in between the 750 Ti and the r9 270.
But the 270 wouldn't be a bad idea necessarily. The 270x require a 500W PSU. So it would be safe to say that the 450w would be enough for sure.. So the question is whether or not you want to gamble the warranty game or not. If it were me, I would go with the 265 to be safe. I have a Club 3D 265 right now and it is really nice. (It's running on a Antec (made by seasonic as is your PSU) PSU)
But what people don't get about selecting a PSU is that wattage isnt really the key factor. The 12v rail is. And that PSU in particular has 34A on the 12v rail which is definitely enough to handle a 270 or a 265. But the warranty issue is still there.