330W PC and 330W power supply?

igor.kedron · Jun 19, 2018

I'm building a mini-PC in NFC S4 Mini case, so I don't have enough space for PSU, thus I'm using Dell 330W power adapter and 400W DC-ATX Converter.

My PC build is:
• i7-8700
• ROG Strix Z370-i
• GTX 1070 Mini (it's not ordered yet.
A bunch of fans, SSD, HDD, RAM, this leads to 300W of maximum power consumption, according to PS calculators.

I was told that during the conversion of power I will lose about 5-7% of my watts, meaning that I will be left with something like 310W. Is that true? I still have 10W of power margin, is that enough?

Few days ago I saw that the price for 1070 Mini and 1070 Ti Mini is similar ($420 and $450), and I am thinking about an upgrade.

My question is: if I will upgrade, should I upgrade to 1070 Ti Mini (which will lead to 330W of max. power consumption), and then undervolt?
Or should I stick with 1070 Mini and overclock it in future, while staying within the limits?
Or should I use 1070 Mini and wait for the next gen. of Nvidia GPUs (which will probably be more power efficient)?

I know that 1070 is an amazing GPU, but in the future I will be forced to upgrade.

volkgren · Jun 19, 2018

Rule of thumb is to plan to not use more than 80% of a power supply's maximum capacity. With the Dell power adapter, I cannot find the technical max power on the +12V rail, and I would imagine it is less than 330W.

For best efficiency a power supply should be operating at 50% capacity. Anything more than that will produce more heat and more stress on the power supply's components leading to a more likely premature failure. In this case you would want to have an excellent quality power supply that can withstand the heat.

No way I would ever power an i7 + GTX 1070 system with that sort of power adapter. The 1070 Ti Mini does use more power than the 1070, so I would say that is out of the question with those power sources. I would be skeptical of powering a 1070 with that, you might have to stick with a 1060.

*Maybe I'm being overly skeptical of the Dell power adapter and/or the 400W converter. Secondary input would be appreciated.

Rogue Leader · Jun 19, 2018

I wouldn't do that. The Dell PSU is not bad quality, but theres gotta be something better in that size. Heavy gaming you will be beating the hell out of it.

igor.kedron · Jun 19, 2018

Rogue Leader :

Unfortunately this is the only and the biggest external PSU on the market today, there is another 400W PSU for med. equipment, but it heats like hell. I saw many NFC S4 builders use this power supply for their 1060s and 1070s, even the official manufacturer of the case mentions Dell PSU as the best option.
Here is an example of a completed working build with 1070, but without HDD, which decreased power consumption to 280W

Rogue Leader · Jun 19, 2018

igor.kedron :

Rogue Leader :

Unfortunately this is the only and the biggest external PSU on the market today, there is another 400W PSU for med. equipment, but it heats like hell. I saw many NFC S4 builders use this power supply for their 1060s and 1070s, even the official manufacturer of the case mentions Dell PSU as the best option.
Here is an example of a completed working build with 1070, but without HDD, which decreased power consumption to 280W

so then don't use a hard drive, IMO.

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330W PC and 330W power supply?

igor.kedron

volkgren

Judicious

Rogue Leader

It's a trap!

igor.kedron

Rogue Leader

It's a trap!

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