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-   -   Which PSU? (https://forum.overclock3d.net/showthread.php?t=91375)

Dawelio 12-01-19 03:43 PM

Which PSU?
 
Heya guys,

So Iíll be honest here, I suck quite bad when it comes to PSUs etc and always kinda goes overkill with them in terms of wattage.

Iím wondering if an Corsair SF600 will be enough or if I should go with the newer SF750? Will those 150W do any difference, in terms of like an 1000W PSU will most likely stay quiet longer than for example an 750W one. Or is this just BS?...

Parts in short: i9 9900K, ASUS 1080 Ti Strix, 32GB 3200MHz memory, 1 x Samsung 970 EVO M.2.

Thanks,
Dawelio

trawetSluaP 12-01-19 03:45 PM

Personally would always want more than I need than be left short.

I also read - and I'm not sure how accurate it is... But PSU's are supposedly at there most efficient around half load so you'd want some headroom anyway if that's the case.

Also means if you upgrade in the future or add hardware you may not need to upgrade the PSU.

tgrech 12-01-19 05:04 PM

Peak efficiency is usually between 50% and 75% load though that varies somewhat.

The 1080Ti usually has a 250W hard limit, the 9900K + chipset will peak at about 200W, the consumption from the fans will probably be the next big difference after that assuming no water cooling pumps or stacks of drives or anything, but the rest of your system is unlikely to consume more than 50W, bringing you to about 500W under full load, or about 83% of a 600W capacity, but note most of the time gaming is closer to around 60-80% load, so most of the time you'd expect to be pulling closer to 300-400W(50-70%) in "heavy" use. So a 600W PSU should have comfortably enough headroom to keep you in its efficient area through most operation(Bearing in mind efficiency drops off again as you go down below 40 and towards 20% and 0%). The efficiency of the PSU is usually more important to when fan spins up than the rating but if a high rating will keep you in a more efficient range that'd help too.

Eddie long 12-01-19 05:14 PM

You could always use something like bequite's psu calculator on there web site to get an idea , not sure how good it is or how accurate

Dawelio 12-01-19 05:23 PM

Quote:

Originally Posted by tgrech (Post 999657)
Peak efficiency is usually between 50% and 75% load though that varies somewhat.

The 1080Ti usually has a 250W hard limit, the 9900K + chipset will peak at about 200W, the consumption from the fans will probably be the next big difference after that assuming no water cooling pumps or stacks of drives or anything, but the rest of your system is unlikely to consume more than 50W, bringing you to about 500W under full load, or about 83% of a 600W capacity, but note most of the time gaming is closer to around 60-80% load, so most of the time you'd expect to be pulling closer to 300-400W(50-70%) in "heavy" use. So a 600W PSU should have comfortably enough headroom to keep you in its efficient area through most operation(Bearing in mind efficiency drops off again as you go down below 40 and towards 20% and 0%). The efficiency of the PSU is usually more important to when fan spins up than the rating but if a high rating will keep you in a more efficient range that'd help too.

Both PSUs in question are from Corsair and are Platinum rated. No fans or anything in the system, orher than the components mentioned. Perhaps 1 fan, but nothing more than that as the case is the tiny NCASE M1.

tgrech 12-01-19 05:49 PM

Platinum rated PSUs only vary by 3% efficiency between 20% and 100% load if to the limits so it's less of a concern there, to be honest if you wanted a 2nd GPU you'd probably want 850W to have the same margin so I don't think the extra 150W margin of a 750 would be of any benefit, realistically you can't get GPUs that consume more than 300W on their own in normal operations so any single-GPU upgrade will be fine with the 600W and any multi-GPU upgrade would probably need more than the 750W. Similarly, with tthe CPU, unless you switch to a HEDT socket you're not going to find many more chips that need the ~160W peak of the 9900K.

NeverBackDown 12-01-19 06:54 PM

You could get away with the 600. 750 is a safer bet if you plan on overclocking.

You could run a similar system with a 1080 and still do fine with a 450watt PSU if you wanted(it's been done and it's safe). 1080ti won't consume much more.

If it's a big price difference, get the 600. If like 10-20 more get the 750.

Dawelio 28-04-19 10:18 PM

Hope you guys don’t mind me resurrecting my old thread, since thought making a new one was a bit pointless...

A mate of mine asked me a question regarding PSUs, now as my OP post in this thread, I don’t feel I’m that qualified to answer his questions really, so asking here instead.

Probably a dumb question to some of you, by logic and all, but asking anyway...

So he has an Corsair RM1000x PSU, but has always been a bit of an ”bragging rights” type of person. So he has started looking into the Corsair AX850 (V2) instead, since it’s Titanium rated and his RM is ”just” Gold.
Although, at the moment, the AX1000 cost a cent less than the AX850... So he’s wondering if he shall go for it.

What I’m thinking though is how much will he gain really? From his RM1000x that scored a perfect 10 on JonnyGuru and he even praised it for surpassing Platinum rating in his tests.

He also wonders regarding the whole 1000W won’t run as hard and therefore as hot, as an 850W and therefore will be cooler and run quieter. Now, even though this sounds logical, I’m not so sure if the real world scenario really is that ”simple”

So what do you guys think about all of this? He’s mostly interested in thoughts regarding the last 2 points... Regarding higher wattage meaning less heat and less noise?.

Thanks all and apologies again for resurrecting my old thread.

Regards,
Dawelio

NeverBackDown 29-04-19 12:27 AM

Literally all he's doing is having a smaller power supply.

SuB 29-04-19 09:26 AM

Having more headroom (so having the 1000w) = the fans will stay off for more time (especially on an RM) and will run quieter and cooler overall,.

Having less watts (850w) = driving that harder = probably more noise...

It really is mostly that simple, you're correct.


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