Seasonic Prime PX 750 - worth it?

OZONE · 14 Sep 2020 at 01:32

In need of a 750W power supply and I've found the Seasonic Prime PX 750 as my top contender.

Has anyone on this forum got experience with this PSU?

JohnG7 · 14 Sep 2020 at 01:41

No but the brand is good but if you want to keep it a while and want a new GPU like the Nvidia 3080 etc then I would go a big higher watts, as 750watt is the min rec so IMO 850watt.

TimAhKin · 14 Sep 2020 at 12:51

I bought the same Seasonic but 850W. Top tier PSU with 12 years warranty.

JohnG7 · 14 Sep 2020 at 13:38

OZONE · 14 Sep 2020 at 14:09

JohnG7 said:
No but the brand is good but if you want to keep it a while and want a new GPU like the Nvidia 3080 etc then I would go a big higher watts, as 750watt is the min rec so IMO 850watt.

I was under the impression 750W would be perfect for the 3080.

Too late though, I've ordered it and it has been dispatched D:

Hopefully I'll be fine!

JohnG7 · 14 Sep 2020 at 14:36

Probably will but best over-rated than under-rated and you want to keep it for future upgrades.

OZONE · 15 Sep 2020 at 14:36

JohnG7 said:
Probably will but best over-rated than under-rated and you want to keep it for future upgrades.

Are there any disadvantages to having a PSU which is very high in wattage?

Are these units more inefficient at lower lowers? If so, by how much and is it significant?

JohnG7 · 15 Sep 2020 at 15:03

In the past yes it would be less efficient running 25-50% most of the time but not now on Platinum and Titanium models.

You could go and read up on JonnyGURU.com (works for Corsair) if you want to find out more.

Try and see how many high end PSU's are in stock now, they seem to be all gone and hard to get in past while for some reason or other in addition with Covid.

HungryHippos · 15 Sep 2020 at 16:21

Wasn't cheap but glad I picked up my Seasonic Prime Ultra 850W Titanium PSU when I did my PC upgrade, should last a long long time

OZONE · 15 Sep 2020 at 16:29

The ROG 850W Thor looks nice, and is Platinum rated. Would that be more efficient at low loads than a 650W Gold rated PSU?

JohnG7 · 15 Sep 2020 at 16:56

AFAIK yes and right to near full load where efficiency normally drops abruptly, again go and read up on it.

OZONE · 15 Sep 2020 at 22:43

JohnG7 said:
AFAIK yes and right to near full load where efficiency normally drops abruptly, again go and read up on it.

Tbh my limited understanding of the topic was PSUs with a higher reserve were less efficient than lower wattage models.

But if the 850W platinum is more efficient across low wattage scenarios (eg 50-100W when idling) than a 650W gold, then I'm happy.

mickyflinn · 15 Sep 2020 at 23:20

OZONE said:
Tbh my limited understanding of the topic was PSUs with a higher reserve were less efficient than lower wattage models.

But if the 850W platinum is more efficient across low wattage scenarios (eg 50-100W when idling) than a 650W gold, then I'm happy.

PSUs with more in reserve doesn't mean there less efficient it's about how much power is drawn at certain loads.

Psu are most efficient at the 50% range but this doesn't mean they massively fluctuate it can very by only a few percent between 20 to 100% load .