Which PSU is better - combining 2 old rigs into one

[jeremychiam]

Which PSU is better for the rig?
Asus Vento u-75ha
Corsair hx 650

Both 8 years old roughly

combining 2 rigs into one to make my little sister a study/gaming/media rig with my old parts.
Basically gonna be an i5 750 , msi mobo, corsair 8gb, radeon 2gb gfx and running 7 old hardrives (all old videos, movies, pics on there)

 

[urbancamper]

Toss up with ancient hardware. I would personally go with the Corsair.

 

[Karadjgne]

Owch. The Asus is a Delta OEM 750w 80+ unit, which historically have been excellent built psus. The HX 650 is a Seasonic S12-II platform 80+Bronze, also excellent. And 7-8yrs old, so approaching end of life for both, well past any warranty period.
I'd try to figure out which psu has had the most abuse, most continual on-time, any OC or overheat issues on the pc etc. Then use the other one.

Quality wise, there's about no difference and draw on both will still be well within any possible cap deterioration limits, figure on either one having @100w less than advertised as maximum output.

Pick one, shelve the other, just in case. Plan on replacement within a year or so.

 

[jeremychiam]

my only issue is that when i did a PSU wattage calculator on all my parts + fans (theres 4 on this massive tower) it says recommend wattage is 638!
I would say corsair has had slightly less abuse but not by much.
TBH I think Im gonna use the asus one just for the extra wattage (also thanks for confirming it was a seasonic s12-II i can now assure it is a solid product) so all the hardrives and fans will have some extra room of wattage to breathe with.

and keep the durable corsair as a backup.

Thanks for the input guys

 

[Karadjgne]

Careful with wattage calculators, they are trixy. A fan, even an older one, generally runs 0.5A or less, that's 24w for all 4 fans. Your hdds will pull @30w each, so maybe 250w for all that. @100w for cpu, 350 so far, another 75w for mobo, 425w, and not knowing the gpu model, I'll guess high at 250w. So that does put the calculations right at 650w. Here's the kicker. There's 7 hdds,gpu and cpu that will never see 100% usage at the same time. Ever. You'll use 1,maybe 2x hdds at any given time since you aren't using an over the top raid system. So that @210w is in reality only 60w tops. You might use the cpu to 100% or even the gpu to 100% but not together or anything you are doing will be seeing 1-10fps or be so slow as to take 20 minutes to open another web page. So that 350w for both will be a lot closer to @250w. In reality, during anything kinda heavy usage, you'll be topping out somewhere around 450w at best. I'll bet with a 648w load, that calculator recommended something like an 850w psu.

Even with capacitor deterioration from time and usage, I don't see an issue with either psu being able to power your pc, especially considering your little sisters gaming/surfing/youtube/netflix/Facebook habits will only be running that pc in the neighborhood of 350w on average.

While that calculator was somewhat accurate in prediction, it only applies to absolute 100% usage, which is about physically impossible to achieve.