I have a 5900x and 3080 FTW3 Ultra. I have been experiencing infrequent shutdowns with my 750 GA (my RMA for a different model is "preparing to ship") since I put the system together last weekend. I'd kept my RAM at 2133 Mhz, but I decided to move it up to 3600, which is what its rated for. My shutdowns increased significantly, and I've moved it back to 2133 Mhz. Its seems to have initially helped increase stability, though I expect to still have shutdowns. I haven't tried underclocking the 3080 to see of that helps.

I know it's not the memory as it passed Memtest86 just this morning.

@tribunal88. I have no doubt you are pushing PSU limits. And yes, xmp or clocking ram higher is a greater power draw. Undervolting GPU should give you more stability if it is indeed a psu issue. I suggest you use a wattage calculator to get a better idea of what you power requirements are. There are probably a number, but seasonic has a good one if you can't find any other. Be sure to set GPU and CPU frequency to max boost level to get a cleared picture of requirements as these can jump quite a bit between idle and boost. I would then use that as an 75%-80% value of the psu wattage you should have. As a rough calculation, I would estimate your setup at around 650-700W (keep in mind the FTW3 Ultra is rated for 450W maxed out). I would say a good quality 850W psu would be the min requirement (more if you want future proofing)

arestavo
A shut off/restart indicates that the power supply can't handle it, or the video card is being pushed too high (usually overclocking - I've actually had this happen on my 3090 FTW3).
 
Test in another computer (friends/repair shop), test a different power supply.
 
If you cannot do either, RMA the card. If the problems persist, RMA the power supply.

this

i guess its my power supply too. 3090 ftw3 ultra, rog thor 1200w. random restarts unless i downclock. i took someones alternative of turning on maximum performance in nvidia drivers and now i can overclock without the restarts. guess the psu really couldnt handle the power spikes.

My PC shuts completely down (have to turn off the PSU by the switch x 10 seconds, then turn it back on) intermittently while gaming.  It's a Thermaltake ToughPower Grand 850 RGB.  I talked with Thermaltake about it, and they want me to RMA the PSU.  I have a Corsair RM1000x coming from Best Buy that will be here on Tuesday.  Hopefully that fixes it.  It doesn't happen often, but when it does, it's only while gaming.
 
EVGA RTX 3090 XC Ultra
AMD 5950x
Trident Neo DDR4 -3600 RGB, 16x2
Asus TUF x570 pro wifi
Sabrent gen 4, 1tb m.2
Sabrent gen 3, 1tb m.2
Arctic Liquid Freezer II 360mm AIO
 

Nothing less than a 850W should be used with a RTX 3080/3090. Let's be real here.

NowWhat123
My PC with a 2016 SSR-750TD (Seasonic Prime Titanium) randomly restarts during desktop load and gaming unless I undervolt and power cap the 3090FTW3 with the wall meter no where near 750W
The cross-ship RMA with Seasonic was approved almost immediately, so I'm assuming they have a known list with expedited approval that includes the SSR-*TD series.

I'm on a 750W Prime Titanium as well and my 3080 FTW3 shuts down as soon I get into 3d mode in ANY game.
How much you undervolted and reduced the power cap?
 
Also, I bought this thing all the way in 2017. Would the darn RMA work as well?
 
 

I snagged an old Thermaltake TR1000 psu from my office and haven't crashed since.  My Corsair RM1000x from Best Buy should be here tomorrow.  The 850 is going back to Thermaltake on Thursday.

Initiated RMA process with Seasonic. Their support team is very fast. Well see if it gets accepted.
 
 

DocMarshall

tamalero
Initiated RMA process with Seasonic. Their support team is very fast. Well see if it gets accepted.
 
 

Weird thing is, my son has an MSI 3080 in a 3800x system with 32g DDR4, two SSD's, 9 RGB fans and it's all powered by a Seasonic 650w PSU.  It was a $50 psu and it has had no problems running this setup.  Regardless, I'm going to upgrade him to a better PSU since I'd prefer he not fry a 3080 lol.
 

It depends on the model. Older Seasonic Prime Titanium and FOCUS were heavily affected. Check this thread for al the list. some older EVGA are affected oo.

AWK16
Last I spoke with Seasonic, some of their older Titanium which will be around 2017 had issues with new 30 series cards, If they wont fix yours, they might send you TX-850 which works flawlessly, but that's my guess.

Will have to see how it goes. Since I'm not in the USA, they might have limitations.


In the other hand. Its the only one PSU I have right now available.

pgagoober
Just saw this thread now and I'm wondering if I need to order a different PSU. I have a Seasonic Prime GX750 (SSR-750GD2) on the way for a new build. Still haven't found a GPU but I have been targetting any 3080 I can find. 
 
Is this shutdown issue present in current Seasonic PSUs? I would really appreciate any advice you guys can offer.

Not the current ones as far I know.  A few already mentioned that the TX and ULTRAS have no issues.

The TX are the new 2019 production as far is Titanium. There are few Prime Platinum even with higher wattage that have/had issues.  I would email Seasonic and they usually respond within day and ask them about PSU in question, they will be able to tell you so you don't have to be wondering and potentially deal with the fallout.

tamalero

DocMarshall

tamalero
Initiated RMA process with Seasonic. Their support team is very fast. Well see if it gets accepted.
 
 

Weird thing is, my son has an MSI 3080 in a 3800x system with 32g DDR4, two SSD's, 9 RGB fans and it's all powered by a Seasonic 650w PSU.  It was a $50 psu and it has had no problems running this setup.  Regardless, I'm going to upgrade him to a better PSU since I'd prefer he not fry a 3080 lol.
 

It depends on the model. Older Seasonic Prime Titanium and FOCUS were heavily affected. Check this thread for al the list. some older EVGA are affected oo.

Seasonic S12III 650 SSR-650GB3

I have an EVGA Supernova 750P2. Will I need to replace that for a 3090 FTW3 Ultra?