Gigabyte GP-P550B Review - Affordable But What About Its Performance & Build Quality?
? Model number: Gigabyte P550B
? OEM: MEIC
? Other members on the same line: two more, P650B and P450B
? Efficiency: ETA-S (82-85 %) 80 PLUS Bronze
? Noise: LAMBDA-S (42.44 dB[A])
? Modular Design: No
? Dimensions: Compact
? Price: 55 dollars or 50 euros
? Warranty: 3-years
? Power Specifications: Single +12V rail
? Power Distribution: 108W on the minor rails, 522W at 12V
? Cables: 1x EPS, 2x PCIe, 6x SATA, 3x 4-pin Molex, 1x FDD adapter
? Cable Length and distance between them: Long enough cables with 120mm instead of at least 150mm distance between peripheral connectors
? In Cable caps: No
? Internal Design / Build Quality: Single-sided PCB, medium size heatsinks, and a bridge rectifier that is bolted on a small heatsink.
? Transient Filter: Complete and has an MOV. There is also an NTC thermistor for protection against large inrush currents.
? Primary Side: APFC and double forward topology
? Secondary Side: Passive Rectification & Group Regulation
? Build quality: Soldering quality is mediocre, and low-end FETs are used on the primary side, and the same goes for the SBR (Schottky Barrier Diodes) on the secondary side.
?Caps and Fan manufacturers: 85C cap bulk cap (Teapo LH). Caps on the secondary side are from unknown manufacturers. The cooling fan is by Bok. Claimed Hydraulic bearing. Best case scenario to have a Rifle bearing.
?Tolerance to high temperatures: PSU went up to 605W at 41 degrees Celsius.
? Load Regulation: Keeps all significant rails within 3%. You should be happy if you got one.
? Ripple Suppression: Ripple suppression is ok on all rails but 12V.
? Transient Response: Transient response is terrible on all rails, especially at 3.3V.
? Protection Features: MEIC was wise enough to OCP on all rails, but 3.3V and OPP at low levels since the bridge rectifier and the rest parts would have a problem keeping up under high loads and with low voltage input.
The 3.3V rail requires OCP tuning to quickly kill the PSU under such high loads and increased operating temperatures.
? Hold-up Time: The hold-up time is a bit lower than what the ATX spec requires, and the power ok signal is accurate, but its hold-up time is way lower than 16ms.
? Inrush Current: Even without a bypass relay, the NTC Thermistor manages to keep inrush currents at low levels.
? Leakage Current: Very low readings.
? Efficiency: This is a low-efficiency platform. If you need higher efficiency and lower thermal loads, better get something else.
The efficiency levels under light and super light loads are very low, as well.
? Overall PF: The APFC converter works well. The Average PF with 115V is high enough.
? Noise Output: The P550B is noisy, so if you want to build a qu
...
https://www.youtube.com/watch?v=b0a98_QAeGc