aka_STEVE_b
That sounds pretty obvious, like the 100's of other stories around here , that your PSU just can't handle the spiking of the big-boy 30xx series cards & tripping the internal protection.
 
your RMA'd / refurbed unit may be fine for awhile again, but I'd look into getting a solid 1000W  or better unit very soon.

B0baganoosh
Maybe kevinc313 will pop in, but he had a Seasonic 1300W (I think that's what it was anyway) that still had an issue with 30-series cards. I think it was a slightly older platform, but should have had plenty of power. I think the trip points were low or it was a multi-rail that had one rail tripping early or something. Seasonic makes some of EVGA's power supplies, (like the new G6 and P6) and I think some of their brand new power supplies were updated with the 30-series power handling needs in mind. They generally do make fantastic power supplies, but the performance requirements of the new 30-series caught everybody off-guard I think. As for other brands/models, anything with a Super Flower Leadex platform seems to have done very well (EVGA G3 for example, I have a 1000W one of those and haven't had any issues with my heavily OC'd 11900k and 3080 ti).
 
I think its possible that if you're clear with Seasonic what you're having an issue with and tell them you need a supply that can handle the 3080ti, they might work with you on a newer model...unless the price difference is major. I've never worked with them before, but some brands have been really good about it. EVGA actually replaced all the GA's in the wild (I think that's the right model anyway, might want to fact check that) that people were having trouble getting to run their 3080's. 

sze5003
 
 
This is what I was thinking too. I have not proceeded forward with the RMA and Seasonic support said they could ask if they can get me "a more recent platform". Their support emails are very quick but I think its a different person answering each time. 
 
I also play Cyberpunk, Cod Cold War, Tomb Raider and I have not had the reboots. They only seem to randomly happen in Car Mech Simulator 2021 and the OCCT Power Stress Test randomly.
 
I've been reading through the forums here, is there a consensus on which PSU's upwards of 850w are a safe bet? From all my years of building PC's Seasonic was always recommended as well as EVGA.

aka_STEVE_b
That sounds pretty obvious, like the 100's of other stories around here , that your PSU just can't handle the spiking of the big-boy 30xx series cards & tripping the internal protection.

kevinc313

sze5003

B0baganoosh
Maybe kevinc313 will pop in, but he had a Seasonic 1300W (I think that's what it was anyway) that still had an issue with 30-series cards. I think it was a slightly older platform, but should have had plenty of power. I think the trip points were low or it was a multi-rail that had one rail tripping early or something. Seasonic makes some of EVGA's power supplies, (like the new G6 and P6) and I think some of their brand new power supplies were updated with the 30-series power handling needs in mind. They generally do make fantastic power supplies, but the performance requirements of the new 30-series caught everybody off-guard I think. As for other brands/models, anything with a Super Flower Leadex platform seems to have done very well (EVGA G3 for example, I have a 1000W one of those and haven't had any issues with my heavily OC'd 11900k and 3080 ti).
 
I think its possible that if you're clear with Seasonic what you're having an issue with and tell them you need a supply that can handle the 3080ti, they might work with you on a newer model...unless the price difference is major. I've never worked with them before, but some brands have been really good about it. EVGA actually replaced all the GA's in the wild (I think that's the right model anyway, might want to fact check that) that people were having trouble getting to run their 3080's. 

I would prefer a EVGA 1000 G+ but its out of stock. I think a 1000w G2 or G3 would work. Seasonic has discontinued a few of the PSU's on the User approved list. Most of the newer ones are Focus GX. They just said go ahead with the Advanced RMA but they would probably send me a refurb X-850 again. They were not specific on what newer model,  so in my next email I am going to mention the possibility of power spikes with the 3080Ti.

Thanks for the shoutout!
 
We have a new member of the Seasonic shutdown infinite sadness club.  Congrats.  Seemingly all Seasonic are suspect with a 3080 Ti FTW3, with possibly the Prime Ultras and most recent Focus (MAYBE) being ok.  Mine is 1300w Prime Gold (non-Ultra), it would power off protect and need a full reset.  Otherwise still works fine, ran fine on a 3080 FTW3 XOC.
 
Currently running a 1000W SF Leadex Plat SE with a3090 FTW3 Ultra.  The G+ is OKish, FSP platform, but I'd say the G2 or G3 Leadex units are far superior.

aka_STEVE_b
the newest EVGA G6 1000 W  unit is currently on sale for only  $ 169.
 
https://www.evga.com/products/product.aspx?pn=220-G6-1000-X1
 

kevinc313

AlexP11223

aka_STEVE_b
That sounds pretty obvious, like the 100's of other stories around here , that your PSU just can't handle the spiking of the big-boy 30xx series cards & tripping the internal protection.

hm, do these spikes affect the UPS too?
 
So if I have a 1600VA/960W APC UPS, then upgrading to a 1200W PSU will be useless?

Only if you intend to run 3090 SLI at max power.

AlexP11223

kevinc313

AlexP11223

aka_STEVE_b
That sounds pretty obvious, like the 100's of other stories around here , that your PSU just can't handle the spiking of the big-boy 30xx series cards & tripping the internal protection.

hm, do these spikes affect the UPS too?
 
So if I have a 1600VA/960W APC UPS, then upgrading to a 1200W PSU will be useless?

Only if you intend to run 3090 SLI at max power.

Can you explain why?
People in this thread say that 3080 Ti/3090 have high spikes triggering protection on many 750-850W PSUs, and recommend 1000+W PSUs.
So it sounds like the UPS also needs to match in order to handle these spikes. And besides the PC I also connect two monitors to the UPS, so it is actually less than 960W for PC.