Is my 750W-Seasonic Tx enough for Rtx 3090?

sewerino26 · 17 Oct 2020 at 13:32

Oki

Thanks guys

sewerino26 · 17 Oct 2020 at 13:33

wookiee87 said:
any oc'd cpu with a stock clocked 3090 and a 750w psu is more than enough, if you plan to run both cpu and 3090 oc'd then you need minimum 850w and ideally 1000w for the headroom

on the other hand a oc'd cpu and a stock 3080 will run fine on a 750w, maybe a good quality 650w and if you push a oc'd cpu and a oc'd 3080 a 750w will also be ok

The problem is with the 3090's they can pull a huge amount of watts for a split second in games and benchmarks which can trip over current protection on psu's and many 750w units can fall foul, thats why ideally a 850w is recommended for a 3090 setup really even though nvidia don't specify that

So if it will trip my psu then buy 850W ?

turbot1984 · 17 Oct 2020 at 13:33

What about older psu's that are not single rail?
My Antec HCP 1000W has got 4 rails @ 40 amps each.
Any potential issues?

Kelt · 17 Oct 2020 at 13:43

sewerino26 said:
So if it will trip my psu then buy 850W ?

IMO, if you had to buy a new PSU, I would be getting a 1000W minimum these days.

I bought an 850W PSU 13 years ago (still going strong, I might add) when that was considered total overkill for my then system.

I just like giving a PSU an easy life, less stress, less problems down the line, just like humans.

sewerino26 · 17 Oct 2020 at 13:52

Kelt said:
IMO, if you had to buy a new PSU, I would be getting a 1000W minimum these days.

I bought an 850W PSU 13 years ago (still going strong, I might add) when that was considered total overkill for my then system.

I just like giving a PSU an easy life, less stress, less problems down the line, just like humans.

Yeah definitely must check first on my psu. Also seen few guys with 650W/750W on youtube with 9700K and Rtx 3090 and they told its fine.

cadmunkey · 17 Oct 2020 at 13:52

750W doesn't seem to be enough. I have one and I am getting system restarts with it so now buying a bigger PSU. You can stop asking questions now

sewerino26 · 17 Oct 2020 at 14:12

cadmunkey said:
750W doesn't seem to be enough. I have one and I am getting system restarts with it so now buying a bigger PSU. You can stop asking questions now

But few guys with 750W on youtube dont have restarts with 9700K and 3090

zx128k · 17 Oct 2020 at 14:33

sewerino26 said:
You bought 1000W? You think 750W cant be enough?

ASUS Strix OC has 3x8-pin PCIe connectors. For a maximum of 3x150 +75watts = 525 watts. Then add the 200 watts for 9700k cpu at stock for a prime 95 avx load[2]. You could max out a 750 watt PSU in theory.
Anyway more realistic view of power draw here, https://www.techpowerup.com/review/asus-geforce-rtx-3090-strix-oc/29.html Peak gaming power draw approx. 400 watts for the system. Furmark is 450 watts approx and this is mostly just the GPU load.

Card has a BIOS power limit of 480 watts https://www.techpowerup.com/vgabios/224964/asus-rtx3090-24575-200909

Something like a Seasonic Prime Ultra Titanium 850 W is what Asus recommends. PSU like a https://www.overclockers.co.uk/cors...ium-power-supply-cp-9020152-uk-ca-24h-cs.html could power this system and have an efficiency average of 94% approx. (average efficiency of the PSU throughout its entire operating range[1]). I would not get it for its 1000 watts but because its a great PSU. Also you never want to upgrade the PSU for 5-7 years. So cool running and above spec is the plan.

Most people I have come across online followed youtube videos and got the minimum PSU they could get to save money. A 9900k and 2080 ti, with a 650 watts PSU. I got a 1000 watts corsair ax1000 and they said overkill. That I was an idoit and could have spent the money on a better GPU. Yet they are now getting new PSU's for their 3080's and 3090's.

So if I use the seasonic.com/wattage-calculator. [4] If I add all the stuff in my case and a 3080 I get a recommend PSU of 1000 watts [5] and a Load Wattage: 749 W. [6]

I emailed seasonic directly and they said that a 650w power supply isn't good enough as the headroom won't be enough to handle a power spike.

[3]

[1] https://www.techpowerup.com/review/corsair-ax1000/6.html
[2] https://www.tomshardware.com/uk/reviews/intel-core-i7-9700k-9th-gen-cpu,5876-2.html see https://cdn.mos.cms.futurecdn.net/cDe9dABDquj8CNDz3gShEA-970-80.png.webp
[3] https://www.reddit.com/r/nvidia/comments/ikx2ti/psa_600w_power_supply_is_actually_enough_for_3090/
[4] https://seasonic.com/wattage-calcul...03GgUjjAfXmwqllponU-F4klukT4AGCUniHK2T3B11YS#
[5] https://www.overclockers.co.uk/seas...-titanium-modular-power-supply-ca-074-ss.html
[6]

https://ibb.co/bsnq9sN Recommended PSU Wattage: 799 W Load Wattage: 749 W recommend PSU of 1000 watts

wookiee87 · 17 Oct 2020 at 14:34

sewerino26 said:
But few guys with 750W on youtube dont have restarts with 9700K and 3090

it'll all come down to how far you push you overclocks, if your going to run at stock speeds for cpu and gpu then a 750w psu will be fine, a moderate cpu overclock and a gpu at stock will be fine too, BUT running max cpu overclock and max gpu overclock then a 750w will fail and ideally 1000w will be needed.

i ran a 3900x with a big oc of 4.4ghz and a zotac 3080 stock and i was fine on a sf 750w psu, a week later i got lucky and purchasd a zotac 3090 and with a 3900x still at 4.4ghz and a stock 3090, i was fine in games but benchmarks made my pc shut down, when i looked closer i relised my psu was being overloaded for a split second which caused the shutdown issue, fortunatly i had a spare hx 1000w corsair psu which i installed and have had no problems at all i can run my oc cpu and apply +100 core and +500 mem offsets on my 3090 and under gaming or benchmarks everything is super stable, NO SHUTDOWNS

aib cards with 3x8pin pci express cables you really need to look at 1000w+ psu as they will pull a hell of a lot of power under load 480w+ in most cases

sewerino26 · 17 Oct 2020 at 14:41

wookiee87 said:
it'll all come down to how far you push you overclocks, if your going to run at stock speeds for cpu and gpu then a 750w psu will be fine, a moderate cpu overclock and a gpu at stock will be fine too, BUT running max cpu overclock and max gpu overclock then a 750w will fail and ideally 1000w will be needed.

i ran a 3900x with a big oc of 4.4ghz and a zotac 3080 stock and i was fine on a sf 750w psu, a week later i got lucky and purchasd a zotac 3090 and with a 3900x still at 4.4ghz and a stock 3090, i was fine in games but benchmarks made my pc shut down, when i looked closer i relised my psu was being overloaded for a split second which caused the shutdown issue, fortunatly i had a spare hx 1000w corsair psu which i installed and have had no problems at all i can run my oc cpu and apply +100 core and +500 mem offsets on my 3090 and under gaming or benchmarks everything is super stable, NO SHUTDOWNS

aib cards with 3x8pin pci express cables you really need to look at 1000w+ psu as they will pull a hell of a lot of power under load 480w+ in most cases

oki thank you for explanation , really appreciate it

Hedge · 17 Oct 2020 at 15:36

Why do you guys keep entertaining this dude.

Its question after question even when he's been given an answer. It's like he wants to remove any chance of thinking for himself.

Kaapstad · 17 Oct 2020 at 15:42

Hedge said:
Why do you guys keep entertaining this dude.

Its question after question even when he's been given an answer. It's like he wants to remove any chance of thinking for himself.

Worse still he posts quite often in other new threads about things that could be affected by poor power delivery, doh.

Hedge · 17 Oct 2020 at 16:55

Kaapstad said:
Worse still he posts quite often in other new threads about things that could be affected by poor power delivery, doh.

Hes exhausting.

I feel bad incase its some kind of autistic trait or something but hes relentless.

cadmunkey · 17 Oct 2020 at 17:49

zx128k said:
ASUS Strix OC has 3x8-pin PCIe connectors.....

Good post that, thanks.

zx128k · 18 Oct 2020 at 11:24

Hedge said:
Hes exhausting.

I feel bad incase its some kind of autistic trait or something but hes relentless.

Autistic person would know everything in depth, would plan and research to an extreme level. Every source would be checked or provided when they comment.

sewerino26 · 18 Oct 2020 at 15:36

sorry guys sorry ok?

sewerino26 · 18 Oct 2020 at 19:22

I read rumours that Seasonic Tx had problems with that cards. Its ridiciolous. The most expensive model of Seasonic and issues. Read:

https://www.reddit.com/r/nvidia/comments/j0t2ob/psu_concerns_with_rtx_3090/

"Linus tech tips specifically had a problem with a Seasonic TX-850W tripping its OCP at 50% power draw on the 3090, causing hard resets."

So change that psu for a i dont know COrsaiR?!

Shaolin Chicken · 18 Oct 2020 at 19:28

I still think it will be worth trying, maybe you will not run into any problems.

sewerino26 · 18 Oct 2020 at 19:29

Shaolin Chicken said:
I still think it will be worth trying, maybe you will not run into any problems.

ok

zx128k · 18 Oct 2020 at 20:15

sewerino26 said:
I read rumours that Seasonic Tx had problems with that cards. Its ridiciolous. The most expensive model of Seasonic and issues. Read:

https://www.reddit.com/r/nvidia/comments/j0t2ob/psu_concerns_with_rtx_3090/

"Linus tech tips specifically had a problem with a Seasonic TX-850W tripping its OCP at 50% power draw on the 3090, causing hard resets."

So change that psu for a i dont know COrsaiR?!

A power supply sold after January 2018 has the updated sensitivity preset of overcurrent protection, so users can use it with confidence.

https://www.reddit.com/r/Amd/comments/9zd1os/seasonic_updated_statement_after_the/

https://www.reddit.com/r/nvidia/comments/j0t2ob/psu_concerns_with_rtx_3090/

Funny thing is that it's not a "flaw". OCP generally triggers due to absurdly high transients. Last we heard of these issues with Seasonic was with Vega 64:

https://www.reddit.com/r/Amd/comments/9zd1os/seasonic_updated_statement_after_the/

Back then Seasonic investigated and essentially said that GPUs are ****** as a single Vega 56 was taking in as much as 600W ALONE.

So if their PSU shuts down, it's not PSU that is a problem. It's GPU which clearly breaks ATX specs. Other PSUs might be fine simply because their filtering is worse (although if Seasonic TX has a problem then all other manufacturers using their designs may too - this applies to Corsair AX and EVGA GS but there are likely more). So if RTX 3090 exhibits same behaviour at 850W, it likely really means it has transient loads exceeding 600W. At which point Nvidia should recall that **** since it's violating specs and add a 3rd 8-pin or decrease the clockspeeds until it no longer asks for absurd amounts of power.

https://www.igorslab.de/en/nvidia-g...-and-common-decadence-if-price-is-not-all/16/

Peaks with intervals between 1 and 10 ms can lead to shutdowns in very fast reacting protective circuits (OPP, OCP), especially in multi-rail power supplies, although the average power consumption is still within the standard. For this card, I would therefore calculate at least 460 to 500 watts as a proportion of the total secondary power consumption of the system with a normal OC with up to 400 watts as the power limit as the graphics card load, in order to have enough reserves for the worst case scenario.

https://www.igorslab.de/en/the-figh...umption-and-load-peak-demystified-igorslab/5/