3 Power supplies or 1?

[piemadd]

OK, so I recently acquired a motherboard which required 3, 8 pin CPU power connectors. My question is about how I should power it. I can either get 3 500 watt power supplies and get one of those 3-to-1 24 pin adapters to have them run in union (picture 1) or get a PSU with 2 8 pin power connectors and then get a molex to 8 pin cpu adapter (picture 2) to power the final cpu power connector. Is one safer than the other? The second option is definitely cheaper, but I would rather not have a bomb sitting in my house ready to explode.

 

Image 1: 

Image 2:

[Grabhanem]

What motherboard is it? A lot of boards come with more 8-pins than they need. 3x 8 pins is something like 1200W of power, which would be very difficult to cool without LN2.

 

If you must use an adapter, I'd recommend getting one of the PCIe 8-pin to EPS adapters that Nvidia ships with Tesla cards. I'd suspect you can just leave one of them out though.

[Bitter]

It's possible to get one power supply with multiple CPU 8 pin connectors.

[piemadd]

11 minutes ago, Bitter said:

It's possible to get one power supply with multiple CPU 8 pin connectors.

I know that, but not 3

[piemadd]

11 minutes ago, Bitter said:

It's possible to get one power supply with multiple CPU 8 pin connectors.

Is some supermicro server board with 4 cpu sockets. I'm probably going to stick with option 1 since the 3 PSUs would be able to collectively supply 1500watts.

[minibois]

16 minutes ago, pierom_qwerty said:

I know that, but not 3

There are PSU's with four EPS connectors: https://pcpartpicker.com/products/power-supply/#B=400

[piemadd]

11 minutes ago, minibois said:

There are those with four: https://pcpartpicker.com/products/power-supply/#B=400

While those would be the best option probably, I'm not planning on dropping more than 150usd on this project just for power lol

[quan289]

In a multi-PSU setup, the supplementary PSU are typically put in a severe crossload scenario (high 12V load and no load on the minor rails), where the voltage regulation can behave erractically. Because of that, you simply don't want to grab multiples of random 500w PSUs. You want to look for a power supply that's independently regulated via dual mag amp or uses DC-DC for the minor rails, which a lot of your budget options starts at the ~$60 price point.

 

Anyways, you could simply buy a modular supply, whose modular board made the 6+2 pin PEG connector and 4+4 CPU connector interchangeable and buy another set of cables separately.

 

For example, the Corsair RM850x:

https://www.bestbuy.com/site/corsair-rmx-series-850w-atx12v-2-4-eps12v-2-92-80-plus-gold-modular-power-supply-black/6229601.p?skuId=6229601

https://www.corsair.com/us/en/Categories/Products/Accessories-|-Parts/PC-Components/Power-Supplies/Type-4-Sleeved-black-8-pin-(4%2B4)-ATX12V-EPS12V-Cable%2C-compatible-with-all-CORSAIR-type-4-pin-out-PSU/p/CP-8920141

 

If you look at the modular ports, you can potentially put five PEG connectors, five CPU connectors, or a mixed of both. The RM850x has two already.

[piemadd]

5 minutes ago, quan289 said:

In a multi-PSU setup, the supplementary PSU are typically put in a severe crossload scenario, where the voltage regulation can behave erractically. Because of that, you simply don't want to grab multiples of random 500w PSUs. You want to look for a power supply that's independently regulated via dual mag amp or uses DC-DC for the minor rails, which a lot of your budget options starts at the ~$60 price point.

 

Anyways, you could simply buy a modular supply, whose modular board made the 6+2 pin PEG connector and 4+4 CPU connector interchangeable and buy another set of cables separately.

 

For example, the Corsair RM850x:

https://www.bestbuy.com/site/corsair-rmx-series-850w-atx12v-2-4-eps12v-2-92-80-plus-gold-modular-power-supply-black/6229601.p?skuId=6229601

https://www.corsair.com/us/en/Categories/Products/Accessories-|-Parts/PC-Components/Power-Supplies/Type-4-Sleeved-black-8-pin-(4%2B4)-ATX12V-EPS12V-Cable%2C-compatible-with-all-CORSAIR-type-4-pin-out-PSU/p/CP-8920141

 

If you look at the modular ports, you can potentially put five PEG connectors, five CPU connectors, or a mixed of both. The RM850x has two already.

Thanks for that! I'm probably going to go that route regarding my PSU. 

[Bitter]

I got a used with all cables RM1000X for around $100 USD shipped from eBay that has plenty of EPS and PCIE power options, deals are out there if you're patient. A good PSU is an investment which can be used and used again in several builds.