Is a 750w PSU enough for 2x 2080 Ti

[xXZexxMooreXx]

Is a 750w PSU enough for 2x 2080 Ti at 60% TDP?

I have one currently in the system and they will be used for mining. According to HWMonitor, the one GPU is pulling 185w and was wondering if two would be safe. I don't have a wall meter nor do I if HWMonitor readings are accurate.

System
Ryzen 5900x
1x Corsair H115i
1x SSD
1x 7.5k HDD
2x 8GB LED Ram
9x 120mm LED Fans
Corsair RM750 psu

 

[Colddecked]

At 60% TDP I think so

 

[xXZexxMooreXx]

At 60% TDP I think so

Thanks for the reply Colddecked.

How much risk is it in the event that it isn't enough? I will be getting a much larger PSU in the near future, but until then the plan is the put the other Ti to to work.

 

[Colddecked]

Not much, if it isn't I imagine you'd just trip somekind of protection and the psu would shut off. I think you should be good, especially if the PSU is a decent one.

 

[oxrufiioxo]

They pull around 280w each at stock settings so at 60% even with 2x cards at most you should be pulling 500-550w total system power.... so your psu should be more than adequate.

 

[maxfly]

If your using a ups you should be able to get your wattage used from the software. My old apc ups and new cyberpower ups both have software that show the wattage being used realtime.

 

[xXZexxMooreXx]

Thank you Colddecked and oxrufiioxo for your replies.

 

[dirtyferret]

They pull around 280w each at stock settings so at 60% even with 2x cards at most you should be pulling 500-550w total system power.... so your psu should be more than adequate.

The PSU is a solid build, I would agree with both colddecked & oxrufioxo

How much risk is it in the event that it isn't enough?

OPP would kick in and shut it down but it seems you have a decent amount of headroom so I would not worry about it.

 

[xXZexxMooreXx]

Fantastic, I was nervous throwing the other one in there.

If one bought a used HP server psu on ebay, and it dies, is that pretty risky? My understanding is psu can take out other components if it fails.

 

[Bill_Bright]

With 2 x 2070Ti and 9 x 120mm fans, even at 60%, I would be shopping around from something a little bigger. As the others have said, 750W is enough, but accidents happen. You might flash your BIOS and forget to set it back to 60%.

if it isn't I imagine you'd just trip somekind of protection and the psu would shut off.

That is the theory, right? But theory and real-world don't always jive. Man is not perfect and cannot create perfection 100% of the time. Just because the RM series of Corsairs have a good design and are solid built, that does not ensure it meets design specs, can not develop a fault, wasn't damaged during transportation or through mishandling, or by Mother Nature via an excessive surge or spike.

So if me, I would use that RM750 for now - until I got a more suitable replacement.

If your using a ups you should be able to get your wattage used from the software.

This is a good idea. If using an UPS and it supports communication with the computer (many do not), or if it has an LCD display panel, you can see the load. However, you would have to catch it during peak load and that would be a challenge. Plus, any reading (via software or display) would be the total load of all devices connected, not just the computer.

A good kill-a-watt meter might record peak levels. This is a budget model and does not.

 

[thesmokingman]

Omg dude, get a proper psu if you value the 2080tis.

 

[Anymal]

Normally you lower powerlimit if mining, so 2 2080ti at 85% power.

 

[dirtyferret]

If one bought a used HP server psu on ebay, and it dies, is that pretty risky?

Not following you; you say "if" as in you have not done it and then say "it dies" so has it died or do you think it will die? Having a PSU die on you is always "risky" anywhere from little risk on a very good PSU to get the fire extinguisher on a bomb PSU and anywhere in-between.

 

[Solid State Soul ( SSS )]

You need a 1000w PSU for a 5900x with 2 high end GPUs

750W is enough, but accidents happen. You might flash your BIOS and forget to set it back to 60%.

Because of this

Omg dude, get a proper psu if you value the 2080tis.

and this

 

[Bill_Bright]

You need a 1000w PSU

850W would be a comfortable and safe size.

 

[oxrufiioxo]

I guess nobody is paying attention to the fact that he is running them at 60% of their TDP.

 

[claes]

I guess nobody is paying attention to the fact that he is running them at 60% of their TDP.

Try reading the posts you’re responding to for their reasoning

 

[Bill_Bright]

I guess nobody is paying attention to the fact that he is running them at 60% of their TDP.

Huh? Did you read the replies?

Colddecked mentioned it right away in his first reply. dirtyferret quoted you where you said it and pointed out he agreed with Colddecked. I mentioned it in the first half of my first sentence in my first reply, then again at the end of that same paragraph.

So who's not paying attention?

 

[xXZexxMooreXx]

Not following you; you say "if" as in you have not done it and then say "it dies" so has it died or do you think it will die? Having a PSU die on you is always "risky" anywhere from little risk on a very good PSU to get the fire extinguisher on a bomb PSU and anywhere in-between.

I haven't bought one yet, only seen some people that mine recommend them for cheap on ebay. I figured if they were used, they probably been ran for a long time.

What I have gathered from the comments is that, it MIGHT be okay to run the 750w for now, but get one with more wattage soon.

 

[Zach_01]

2080Ti has a 250W TDP so x2 you got 500W and that’s real power draw without rest of system. Depending on the rest of system you must add another 150W to 300W. For the 5900X system you’ve listed I would add at least 200W. And that’s all system on stock.
At 60% you’re down to 300W for GPUs.

But all this is for normal usage. For mining is a very different story, I can tell from personal experience. Mining software does not utilize fully the GPU, only a part of it and VRAM. You can actually underclock and undervoltage the GPU to a certain point without losing mining perf, and that is what saves power. BTW the 5900X is a complete waste for a GPU mining system. You can easily put a small APU in there. Unless you want to use it for other tasks too. And this is what complicate things. You must fully be aware all the time of what those GPUs are doing when/if gaming for example, or you can near fully load the PSU, if not over load it.

 

[xXZexxMooreXx]

2080Ti has a 250W TDP so x2 you got 500W and that’s real power draw without rest of system. Depending on the rest of system you must add another 150W to 300W. For the 5900X system you’ve listed I would add at least 200W. And that’s all system on stock.
At 60% you’re down to 300W for GPUs.

But all this is for normal usage. For mining is a very different story, I can tell from personal experience. Mining software does not utilize fully the GPU, only a part of it and VRAM. You can actually underclock and undervoltage the GPU to a certain point without losing mining perf, and that is what saves power. BTW the 5900X is a complete waste for a GPU mining system. You can easily put a small APU in there. Unless you want to use it for other tasks too. And this is what complicate things. You must fully be aware all the time of what those GPUs are doing when/if gaming for example, or you can near fully load the PSU, if not over load it.

It turned out that I couldn't put both 2080 Ti's in the same computer as one of the TI's (Aorus) shroud is too big to allow putting the other one in. I tried dropping to a lower slot, but then mobo headers wouldn't allow it. So I ended up putting the new Ti, with the smaller footprint with a Vega 64 (undervolted (says 140w when mining with it)).

I didn't get the 5900x for mining, I just happened to have it with the 750w. I have a second computer with a Ryzen 3600 in it, which is what I put the other Ti in as it only has 700w psu. I have an 8 GPU mining case coming, so I'm just going to use the 3600 for that.

 

[Bill_Bright]

Thanks for coming back with your followup.