Upgrade to a RTX 3070, will it trip the overcurrent protection of a SeaSonic M12II 750W

[Force Gaia]

So I'm upgrading my brother's PC, and this is the first time I'm having to accommodate a 30-series or later, and the spikey power draw and overcurrent protection tripping has me concerned.

 

I'd like to check a SeaSonic M12II 750W will be okay to use, as we'd like to avoid having to replace what should be an adequate PSU if not for this power consumption behaviour.

 

The rebuild is currently as follows:

• AMD Ryzen 7 7700X
• Asus PRIME X670-P WIFI ATX
• G.Skill Trident Z 32 GB (2 x 16 GB) DDR5-6000 CL36
• Palit JetStream GeForce RTX 3070 LHR 8 GB

pcpartpicker estimates the power draw as 454W, which while it seems a bit low I don't think it's as inaccurate as to exceed the PSU capacity.

Will the SeaSonic M12II 750W okay for this given the power draw behaviour of these components?

[Dukesilver27-]

Only 1 way to find out, try it.

And also, 4800 DDR5? At least get 6000.

https://techuda.com/does-ddr5-ram-speed-matters/

[Force Gaia]

Just now, Dukesilver27- said:

Only 1 way to find out, try it.

And also, 4800 DDR5? At least get 6000.

https://techuda.com/does-ddr5-ram-speed-matters/

Would really rather not find out the hard way, partly due to cable routing, and mostly due to the fact I'll be assembling this between Xmas and new year when I'm visiting for the holidays, and if it's not adequate it'll be hard to get a replacement in time before I leave the area.

As for ram speed, thanks for the heads up

[Dukesilver27-]

Well, then theoretically speaking, it should be fine.

650W is the recommended PSU capacity for 3070, this is estimated based on a very power hungry CPU coupled with GPU. In full load, your system shouldn't even reach 450W, maybe 300-400W, there is no way the games would fully use the 7700X, 3070 maybe about 200-250W with OC, so even with the transient spikes, most likely it should be okay.

HOWEVER, the PSU is low quality, so there's no guarantee, which is why I said there's only 1 way to find out.  

 

Personally, I'd just try it, high chance it will be okay, if it trips the PSU, just undervolt and limit power draw to reduce the chance of it tripping again. 

 

[TylerD321]

29 minutes ago, Dukesilver27- said:

Well, then theoretically speaking, it should be fine.

650W is the recommended PSU capacity for 3070, this is estimated based on a very power hungry CPU coupled with GPU. In full load, your system shouldn't even reach 450W, maybe 300-400W, there is no way the games would fully use the 7700X, 3070 maybe about 200-250W with OC, so even with the transient spikes, most likely it should be okay.

HOWEVER, the PSU is low quality, so there's no guarantee, which is why I said there's only 1 way to find out.  

 

I'd personally just try it, high chance it will be okay, if it trips the PSU, just undervolt and limit power draw to reduce the chance of it tripping again. 

 

I ran a test on my machine (view specs in my signature) by running cinebench and 3dmark speedway test at the same time. I have everything in my signature plugged in to the same UPS. The power draw was a consistent 525 watts. The load of both gpu and cpu were 100%.

 

750 watts should be plenty as the 10700k has a higher listed TDP (and is overclocked), I have a 3070 as well. I am realizing that maybe my 850 watt psu is overkill...

[Force Gaia]

20 minutes ago, TylerD321 said:

I ran a test on my machine (view specs in my signature) by running cinebench and 3dmark speedway test at the same time. I have everything in my signature plugged in to the same UPS. The power draw was a consistent 525 watts. The load of both gpu and cpu were 100%.

 

750 watts should be plenty as the 10700k has a higher listed TDP (and is overclocked), I have a 3070 as well. I am realizing that maybe my 850 watt psu is overkill...

It's not the total TDP that concerns me, it's more the potentially spiky draw that could potentially trip the OCP on lesser PSUs. The Corsair RM series might handle this well enough

[TylerD321]

1 minute ago, Force Gaia said:

It's not the total TDP that concerns me, it's more the potentially spiky draw that could potentially trip the OCP on lesser PSUs. The Corsair RM series might handle this well enough

An article I read stated that the highest spike they could get a 3070 to do was only like 50 watts higher than the average power consumption of that model.

[Force Gaia]

1 minute ago, TylerD321 said:

An article I read stated that the highest spike they could get a 3070 to do was only like 50 watts higher than the average power consumption of that model.

So I'm potentially thinking of the 3080/90 then? i thought that the 3070 did it too?

[TylerD321]

6 minutes ago, Force Gaia said:

So I'm potentially thinking of the 3080/90 then? i thought that the 3070 did it too?

Here is a random article with figures similar to what I stated. I am not knowledgable enough to comment on the validity of the article but first glance says you will be fine.

 

https://www.ecoenergygeek.com/rtx-3070-power-consumption/

[--SID--]

4 hours ago, Force Gaia said:

SeaSonic M12II 750W

Old PSU with double forward on the primary side. Not a unit I would use with all the new parts you have.

[jaslion]

Its an old unit and by todays standards not good.

 

It was decent years ago but now components expect more form a psu and the s12 series is quite known to trip with them.

 

Not something id use and I would replace it with a better unit.

[Mark Kaine]

11 hours ago, Dukesilver27- said:

just undervolt

... that for whatever reason does not reduce power draw necessarily, but you also said to use power limiter, which yes, indeed reduces power draw...

 

personally... i would not use seasonic products... bought 2 *very expensive* seasonic psus, both in utterly shambles when they arrived here, even though the packaging was *pristine*... (literally WTF)

i tried one of them (without connecting it to anything but the "tester") and unsurprisingly it instantly melted at the power plug... lol.

 

IMO, if your psu supplier thinks its a good idea to package in a psu "tester" that's a huge red flag right there, basically saying customers should do QA themselves... (would be funny if it wasn't so insanely overpriced products...)

[Dukesilver27-]

2 hours ago, Mark Kaine said:

... that for whatever reason does not reduce power draw necessarily

Power is calculated with voltage times amps, how does reducing voltage not affecting power draw? It's simple physics. 

Anyway, from all the GPUs and CPUs I've tested, undervolting does reduce power draw. 

[Mark Kaine]

Just now, Dukesilver27- said:

Power is calculated with voltage times amps, how does reducing voltage not affecting power draw? It's simple physics. 

because nvidia boost is a thing... 

 

lower voltage = lower temps = higher frequencies = power draw is still same as without undervolt,  only limited by gpu bios seemingly...

 

ps: and yeah, you'd think the gpu should still heat up at some point... but it simply doesn't... unlike without an undervolt where it'll heat up and eventually reduce clocks... doesn't happen with my undervolt... temps stay low (50-60c) frequencies  high (typically 2010mhz)

 

 

2 minutes ago, Dukesilver27- said:

Anyway, from all the GPUs and CPUs I've tested, undervolting does reduce power draw.

yeah... weird... neither my gpu or cpu did/do this... my old 3600 even used more power with a *negative* voltage offset (forgot exactly but i think like 125w... which is a lot for a so called 65w tdp cpu....) my 3070 simply clocks higher and still hits the power limit with an undervolt of -100mv (270w)

 

but reducing the power limit actually works reliably and is much easier to do too.