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FInding the right PSU


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#1

KaZi61
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Posted 02 March 2021 - 01:52 PM

Hi team,

 

I am in the process of putting together a build and only just remembered I need a PSU. I've always been stuck when it comes to picking them since I don't entirely understand what exactly I need. I feel like I tend to underestimate my usage requirements and then always have difficulty with USB components like hard drives that need to run off it.

 

I've run two calculators and one says 650W and the other 850W. I am leaning towards 850W since I would rather have more in case I keep adding drives.

 

The build so far

CPU: Ryzen 9 5900x

GPU: RTX 3070 vision

mobo: B550 vision

Drives: 2nvme, 3 SATA and potentially 3 external USB drives

RAM: 32gb 3200mhz

 

Ideally it would be quiet and somewhat cool.



#2

djotter
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Posted 02 March 2021 - 02:50 PM

Going for a slightly high voltage rating will keep you lower in it's power delivery range, which means it will be running cooler and quieter. I would agree 650W+ is a good spot for your setup, while 850W would be a little overkill.

 

What case are you using? Will it fit a standard ATX PSU, or do you need SFX?

 

Look for a Gold or Platinum rated 750W or higher PSU from a brand like Corsair, Silverstone, or EVGA.

 

Here is a list of 750W examples, but if you want 850W, just get that instead.

Corsair

https://classic.pric...t.php?p=4664029

Silverstone

https://classic.pric...t.php?p=2292987

EVGA

https://classic.pric...t.php?p=5193868

 

The following is an old list for refrence, but the brands and product lines are mostly still relevant.

https://classic.pric...?showtopic=1113


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#3

LinuxUser
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Posted 02 March 2021 - 05:34 PM

650 W would probably be about right, but 750 W would be fine and isn't too much more expensive. I wouldn't bother with more. Any of the ones above should be good, although I believe the Silverstone has a sleeve bearing fan which is a dubious choice.


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Recommended Power Supplies Recommended review sites Why stores shouldn't be removed RAM voltage

i5 7400, Gigabyte GA-B250M-D3H, 16 GB DDR4, integrated graphics, Adata XPG SX8200 480 GB (NVMe), 3x Kingston SSDNow KC380 120 GB, Corsair MX100 128 GB, Spinpoint F3 1TB HDD, DVD writer, all inside a wood case I built, Dell U2412M 24", U2311H 23" IPS and Philips 150B4 15" monitors, wood-bodied mouse, Dvorak keyboard, openSUSE Tumbleweed, Windows 8.1 Pro in a VB VM inside Linux

I may occasionally give advice regarding (consumer) law, but it is only my opinion based on my reading – I am not a lawyer.

Romans 3:23; 6:23; 5:8; 10:9-10,13


#4

KaZi61
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Posted 03 March 2021 - 03:15 PM

Thank you both, I will grab the Corsair one and just pay the extra $50 and get the 850W. I would rather overkill than have to think about changing again down the line.

 

It's for an ATX setup so the suggestion of the Corsair RM series will fit in well with my current Corsair ****** setup.

 

Thanks again for the help!



#5

LinuxUser
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Posted 03 March 2021 - 07:23 PM

I'd be pretty surprised if you ever found a 750 W supply limiting you, unless you either get into multiple GPUs (not really a thing now), or major overclocking. That hardware at stock speeds will only use about 500 W with everything flat out, so 650 W would be a good choice and 750 W gives loads of headroom for overclocking or hardware upgrades.

 

But an 850 W will work fine, just with lower efficiency at lighter loads (i.e. the normal situation).


  • KaZi61 likes this

Recommended Power Supplies Recommended review sites Why stores shouldn't be removed RAM voltage

i5 7400, Gigabyte GA-B250M-D3H, 16 GB DDR4, integrated graphics, Adata XPG SX8200 480 GB (NVMe), 3x Kingston SSDNow KC380 120 GB, Corsair MX100 128 GB, Spinpoint F3 1TB HDD, DVD writer, all inside a wood case I built, Dell U2412M 24", U2311H 23" IPS and Philips 150B4 15" monitors, wood-bodied mouse, Dvorak keyboard, openSUSE Tumbleweed, Windows 8.1 Pro in a VB VM inside Linux

I may occasionally give advice regarding (consumer) law, but it is only my opinion based on my reading – I am not a lawyer.

Romans 3:23; 6:23; 5:8; 10:9-10,13


#6

KaZi61
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Posted 04 March 2021 - 09:26 AM

Okay 750W it is!

 

Thanks for your help team! It's going to be a killer waiting till April for the parts to arrive.


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