Is an Enermax Pro 82+ 625W Enough for a Gigabyte GTX295?

Hi,

Exactly as it says in the title, I bought a gaming PC in late November;

i7 920 - no o/c
Gigabyte GA-EX58-UD5
Gigagbyte GTX 295 - no o/c
3gb corsair dominator ram

and Enermax Pro 82+ 625w psu - http://www.enermax.co.uk/produkte/netzteile/pro82-2.htm...

Its great and does everything I want it to, however I have seen that the gpu requires a recommended 650w and 50a across the rails. The enermax just scrapes this (625w and 50a on rails), this has been bugging me for a while and I am forever checking temps and monitoring the gpu.

I don't want to pay out any more money (I'm a student   ) so if I am cutting it too fine does anyone have any suggestions?

On a side note, do PSUs have safety features to stop the electrical surge from frying other components in the unlikely case of a failure/overload?

Maybe I'm just worrying too much...

Please put me out of my misery   Thanks,

Harry