on just how far you want to go (and I wouldn't even go an inch over the line with that PSU). If you can replace it, then it would be a good idea.....it will certainly offer a more stable gaming platform with a much more powerful...
Of course it depends on your budget, and what your PSU can safely handle. Can you provide your PSU model info?
I have a Chieftec 80+ 400W power supply .
Chieftec....+ 400watts = shrugs
not sure about this brand but 400watts can probably do it?? if so, you wouldnt have a lot of headroom as you are coming close to peak wattage.
psu is very important. especially when you are investing more into your pc, the psu shouldnt be underrated.
on just how far you want to go (and I wouldn't even go an inch over the line with that PSU). If you can replace it, then it would be a good idea.....it will certainly offer a more stable gaming platform with a much more powerful GPU. Get a PSU that will last you through a couple of upgrades though, so you're not in the same predicament next time.
Example: Get a good quality 500w PSU, even though for budget reasons you may choose a RX460, so you have plenty of options with your PSU next upgrade