felixxkoehler :
DSzymborski :
I would not use that PSU; it's a known garbage-tier brand. Maybe in a light office rig on a very strict budget, but not in a PC with a dedicated GPU and certainly never in an overclocking scenario. It's not even a bad 400W PSU, it's a bad 280W because of the ancient design that has a rail distribution that PCs haven't favored since the 1990s.
These are the least expensive PSUs I'd let touch anything I own.
PCPartPicker part list /
Price breakdown by merchant
Power Supply: SeaSonic - S12II 520W 80+ Bronze Certified ATX Power Supply ($38.99 @ SuperBiiz)
Total: $38.99
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2017-10-19 15:20 EDT-0400
PCPartPicker part list /
Price breakdown by merchant
Power Supply: Corsair - CX (2017) 450W 80+ Bronze Certified ATX Power Supply ($43.98 @ Newegg)
Total: $43.98
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2017-10-19 15:21 EDT-0400
Neither are amazing as this SeaSonic is an older platform and this Corsair is a modern platform but with good rather than great internals. But they're good on a budget, both far less likely to either make the internals of your PC look like a Michael Bay movie or slowly damage your parts over time than a junk PSU.
Will a 550 Watt Rasurbo Silent & Power DLP 55.1
OR a FUSION 550R
OR a LC6550 be enough (all of them are 550 Watt)?
And thanks for the answer my initial question.
The LC Power is garbage. Any and all.
The Rasurbo is an old HEC platform with poor voltage regulation and bad filtering.
If the FUSION 550R refers to the old Arctic one made by SeaSonic, it's unlikely to be terrible. But it's an ancient platform with some poor capacitor selection, especially for SeaSonic. Any one of these that exists has either been sitting in a factory for a *long* time or has been used way past its life expectancy.
The PSUs I listed are far better than the first two and better than the third one. The power supply is the most important part of the PC and the very, very last place to be putting in a mediocre used part from 2009 to save a few bucks.