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700W SFX PSU with a 3080 not cutting it anymore, other options?

omgrubberduck

So yeah, PC keeps powering off under stress randomly, fairly sure it's the PSU not handling transients from the GPU well. Am I crazy for wanting ~850W and at least platinum efficiency? I'm worried about a 750W not being able to cut it since this 700W is not even 3 years old. Anything I'm finding SFX at 850W is Gold efficiency, I mainly want higher efficiency since it's so enclosed.

 

Specs:

Motherboard: GIGABYTE B550I AORUS PRO AX

CPU: Ryzen 5 5600X

RAM: 16GB

GPU: ASUS RTX 3080 TUF OC

PSU: SilverStone SX700-PT PSU

Case: Sliger CL530

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According to Optimum Tech on YT (he does an insane amount of ITX builds) the Corsair 750W SFX units are fine with a 3080. Silverstone's may just be an older PSU platform that doesn't deal with transient spikes well (some Seasonic ATX PSUs had this issue as well before they revised them). Have you tried pulling the power target on the GPU down to see if it still cuts off? That would confirm or rule out transients being the issue, and best to give it a shot before shelling out for a new unit.

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Main PC 

CPU: i9 7980XE @4.5GHz/1.22v/-2 AVX offset 

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Motherboard: EVGA X299 Dark 

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PSU: EVGA 1600W T2 

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Apart from setting power limit, try undervolting and do not OC. Power draw would be reduced quite a bit, it might save you from shutdowns.

Also, platinum efficiency does not mean that it is the highest quality PSU.

Efficiency is efficiency, different from quality. Besides, platinum PSUs are usually 1200w+ to make it worth the price, <1000w PSUs are usually gold because platinum makes no sense.

Not an expert, just bored at work. Please quote me or mention me if you would like me to see your reply. **may edit my posts a few times after posting**

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RAM: Team Delta TUF Alliance 2x8GB DDR4 3200MHz CL16

SSD: Team MP33 1TB

PSU: MSI MPG A850GF

Case: Phanteks Eclipse P360A

Cooler: ID-Cooling SE-234 ARGB

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16 hours ago, omgrubberduck said:

So yeah, PC keeps powering off under stress randomly, fairly sure it's the PSU not handling transients from the GPU well. Am I crazy for wanting ~850W and at least platinum efficiency? I'm worried about a 750W not being able to cut it since this 700W is not even 3 years old. Anything I'm finding SFX at 850W is Gold efficiency, I mainly want higher efficiency since it's so enclosed.

Weird that it's powering down.

My rig is a EVGA RTX 3080 FTW3 Ultra and 5600X, only draws only ~520W at the wall: https://pcpartpicker.com/list/wj7kW4

 

It ran on 750W just fine as well, so I don't think 700W is out of the question unless there's some missing info or thing about your power draw or doing OC.

 

If all our parts are similar (maybe they arent?) then if it is in fact spikes then they would have to be +180W or more, which seems crazy to me since I thought a driver update resolved most transients with 30 series.

So I'm not sold on the spike theory. I also don't know how SilverStone is as a brand in terms of parts & such.

 

I recommend 850W just because I have it, and it has near max efficiency in moderate to heavy load (for my build), though I don't know if efficiency curves are different for SFX.

 

I do think Platinum 80+ seems overkill unless you actually do the math on your real usage and determine you would actually save on electricity costs during the PSUs warranty period. 80+ Gold should be fine, and the 80+ rating doesn't necessarily indicate performance/part quality, especially in Platinum vs Gold.

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If in Germany go for Phanteks SFX 850W (it's 199 eur in one shop until 24-th).

 

It's the same platform as the good Silverstone 850R Extreme

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