Best is just to get 1 step higher than what you think is enough.

caters for degradation and headroom for enhancements. lasts you longer by just paying a bit more.

yes. that's what I mean.

3 ways to look at things.

1. buy what you think is sufficient.

2. buy something that's 1 notch above what you think is sufficient.

3. take what you need, multiply it by 2 and buy 1 step higher. (ok la this one not necessary la but it's one of the good rule used for buying HDD. to avoid running out of space fast)

a PSU will last longer when it's at lesser load.



either one is fine but if you can, the 620w will give you better value as the higher power rating also means your usage stresses it less.

that additional 60w is a lot of headroom for upgrades or overclock if some day you intend to walk that path.

No. Power draw doesn't cause it to go kaboom.

I'm using Xigmatek NRP-PC602 600W

I'm running i5 / i7 / FX with HD 7970. Overall more power consumption than yours, no issues.

http://www.jonnyguru.com/modules.php?name=...tion&ndfaq_id=3

you can try it yourself.

from my personal experience (as a serial PSU killer of lowyat.net)

I've had 450w PSU delivering 400w 24/7 and I've had 600w delivering 300w 24/7.

guess which one lasts longer.

sorry, what you talking about?

in my case. the 450w delivering 400w 24/7 didn't last long. I've had a few that I run at 80% - 90% load. they deteriorated really fast, depending on the brand and quality.

what I mentioned was just to show how the stress affects the PSU. we've not gone into the details like the construct and components of the PSU.

case in point, my Gigabyte Odin GT lasted way longer than Vantec Ion2 of similar wattage doing similar high-load 24/7 routine.

many components are operating within a certain amount of power draw, it's not difficult to estimate.

Kill-A-Watt is not something found here, nevertheless like I said - it's not difficult to estimate even without having to use that tool.

most systems barely consume 300w, even when playing games.

however PSU recommendation is always on a safe figure assuming everything is on full load. No reason to recommend PSU that's "JUST NICE" that limits the headroom.

btw those people DISCOVER because they don't know. PSU information / knowledge has been around for ages.