I want to buy a gtx 1080 G1, is my PSU ok?

p1st1l4c4

Prominent
Jan 8, 2018
16
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510
my current system:

i7-4790
gtx980
asus z97-k
ssd 850evo,
2tb wd hdd

FSP raider 650W

been running it for 2 years without an issue.

will it be ok for the gtx 1080 too?
some say i should exchange the PSU.. but i don't want to waste money, except if it's really necessary, although one thing to consider that i've been running locked 60fps until now, and from now on i'd go unlocked with 144hz g-sync monitor, meaning the gpu and cpu would have higher load and draw more power.

what do you suggest?