Dual PSU or buy new for RTX 3060 Ti

[Timelesscow]

So i just got most of my parts for my first PC build. When i first ordered the parts i ordered a RTX 2060, but on the release of RTX 3060 Ti, i ordered it as well, with plans to return the 2060.

Now i'm guessing that a 550W PSU is not enough to power my build, with the RTX 3060 Ti. And since my brother has a spare unopened 550W PSU i can have for free, i was wondering if a dual PSU setup is possible, or if i should just buy a larger PSU. And if so, how many watts should i get?

Parts i ordered - the RTX 2060:

PCPartPicker Part List

CPU: AMD Ryzen 7 3700X 3.6 GHz 8-Core Processor  
Motherboard: Asus ROG STRIX B550-F GAMING ATX AM4 Motherboard 
Memory: Corsair Vengeance LPX 16 GB (2 x 8 GB) DDR4-3600 CL18 Memory 
Storage: Western Digital Blue SN500 250 GB M.2-2280 NVME Solid State Drive 
Power Supply: Cooler Master MWE Gold 550 W 80+ Gold Certified Fully Modular ATX Power Supply 
Case Fan: Noctua F12 PWM 54.97 CFM 120 mm Fan
Case Fan: Corsair SP140 49.49 CFM 140 mm Fans 2-Pack 
 

PSU that my brother gave me:

Power Supply: Corsair CXM 550 W 80+ Bronze Certified Semi-modular ATX Power Supply

 

If it is of any importance the new GPU i ordered was "Gainward  GeForce RTX 3060 Ti Phoenix GS"

[Mateyyy]

Why don't you first try it out with your MWE Gold 550W, instead of doing something stupid and potentially unnecessary?

[SupaKomputa]

550w will be enough for 3060ti. 

Its a mid end card.

[Juular]

1 hour ago, Timelesscow said:

Now i'm guessing that a 550W PSU is not enough to power my build, with the RTX 3060 Ti.

It's 200W GPU with 100W CPU ...

[TheDeadDanishman]

Did it end up being enough?

[Lastronaut]

Well, in increased energy costs alone you will find that it would be inefficient to utilize two power supplies. I would just upgrade to a 750W Gold PSU and call it a day.

[Middcore]

Your existing 550W power supply is probably enough. I ran a 3700 and a 2080 off of a good 550W. if not, please just get a single higher-wattage PSU instead of pulling an Austin Evans on a daily driver PC. Austin's dual-PSU abomination in Scrapyard Wars only had to function long enough to run their benchmark suite and he only went that route out of desperation.