Question Power Planning for ASUS DUAL-RTX3070-08G

[Imacflier]

Good Morning, Guys.

I am going to use the ASUS DUAL-RTX3070-08G paired with an HP EliteDesk 800 G5 Mini.

Since the HP EliteDesk 800 G5 Mini does not have a PCIE slot and is physically smaller than the HP EliteDesk 800 G5 Mini, the 3070 must be mounted externally on an m.2 to PCIE adapter.

The RTX3070 has a TDP of 230 Watts, far in excess of the capacity of m.2. The adapter is designed to accept an Alienware power adapter of 220 Watts.

Since 230 Watts > 220 Watts, I thought I would use Afterburner to undervolt the RTX370 down to the power available.

I have literally no experience with either the RTX3070 or with undervolting, which leads to

Question #1: Do any of you more experienced folks have any idea on just how much I must reduce the voltage to reduce the RTX3070 power demand down to 220 Watts?

But wait! I would expect that, when playing AAA games, the RTX3070 will demand power in excess of the 230 Watt TDP, which leads to

Question #2: Can I safely ignore these power demand spikes, and if not, how much power demand do I need to plan on (This is all 12vdc power)?

Now I am quite certain you all want to know why on earth I would resort to such a Rube Goldberg lash up! The answer is simply that I already have ALL the parts sitting in my parts drawer and I would MUCH rather use them than let them gather dust or (gasp) pursue a different solution!

Please advise me if you can.

TIA,

Larry

 

[Lutfij]

You might want to understand that the RTX3000 series was notorious for high transient load spikes;

View: https://www.youtube.com/watch?v=wnRyyCsuHFQ

leading people to reinvest on PSU's with overprovisioning. People who owned an RTX3090 were later asked by reviewers in the industry to get a 1.2KW reliably built PSU. That wattage number trickled down as you went down the stack eventually leading users to have an 850W reliably built unit for an RTX3070. With that I see your endeavor with strapping that GPU onto an uSFF(that shouldn't have that GPU) to be met with a lot of rebuttal from the platform itself.

Now I am quite certain you all want to know why on earth I would resort to such a Rube Goldberg lash up! The answer is simply that I already have ALL the parts sitting in my parts drawer and I would MUCH rather use them than let them gather dust or (gasp) pursue a different solution!
Instead of crippling powerful hardware to fit inside a shoebox, I'm sure you could build a regular desktop(SFF)platform, sell it or hand it down to someone in your family tree and call it a day instead of dropping resources for something that shouldn't exist.

My 2 cents.

 

[Imacflier]

[COLOR=rgb(0, 0, 0)]Lutfij[/COLOR],​

Thank you very much for your reply, especially for that link! I rather suspect I will have to use a substantially larger 12 vdc supply.

I know that most folks do not approve of my approach, to which I can only reply "Different strokes for different folks!"

I have used this approach, successfully, twice before, although with lesser GPUs, and with the appropriate changes see no reason not to proceed.

I am trying very hard not to make this thread not raise any member's hackles, btw.

Thanks again,

Larry

 

[Zerk2012]

Pretty much your 3rd post on this same subject.
Buy the appropriate motherboard and a case and call it done.