Short answer: quality capacitors help a power supply last, and Japanese brands have a strong reputation. But the overall design matters more than where one part comes from. A well-designed unit with good Taiwanese capacitors beats a poor unit with Japanese ones.
What capacitors do
Capacitors store and release energy to smooth out the power. They’re one of the parts that age fastest, especially when hot. As they age, a power supply can get worse at holding its voltages steady.
Why the 105°C rating matters
Capacitors are rated for a maximum temperature, usually 85°C or 105°C. A part rated for 105°C has more margin in a warm case, so it tends to last longer. Reviewers note it as a plus.
What my picks use
| Power supply | Capacitors noted |
|---|---|
| Corsair RMx (2024) | All Japanese electrolytic capacitors (Corsair) |
| Corsair SF Platinum (2024) | 105°C Japanese capacitors (KitGuru) |
| NZXT C Series Gold (2024) | 105°C Nichicon capacitors (KitGuru) |
| Seasonic Core GX ATX 3 | Taiwanese TEAPO capacitors (KitGuru) |
The Core GX is a good example. KitGuru noted its Taiwanese capacitors, yet lab reviewers still found it well built with good electrical performance.
What matters more
- Temperature. A unit with headroom runs cooler, so its capacitors last longer.
- The design. HWBusters points out that the manufacturer behind the platform decides component choices and how hard they’re pushed. See who really makes your power supply.
- Warranty. A long warranty tells you the maker expects the parts to last.
Should you pay more for Japanese capacitors?
Not on their own. Treat them as a bonus on a unit that already reviews well. Use my tier list and the lab reviews on each product page.
- All Japanese capacitors · Tier ACorsair RMx (2024)80 Plus Gold · Fully modular · ATX · 750/850/1000WCorsair’s own spec, plus a 10-year warranty.Check 850W price
- 105°C Nichicon · Tier ANZXT C Series Gold (2024)80 Plus Gold · Fully modular · ATX · 850/1000/1200WA quiet, well-built Gold unit.Check 850W price
Questions
Are Chinese or Taiwanese capacitors bad?
Not necessarily. Many are good. Overall design and temperature matter more.
What does 105°C mean on a capacitor?
It’s the maximum temperature the part is rated for. Higher gives more margin in a warm case.
Can I see the capacitors in my power supply?
Not without opening it, which isn’t safe and voids the warranty. Lab reviews show them.
Do capacitors cause power supply failures?
Ageing capacitors are a common cause of a unit getting worse over time, especially when it runs hot.
Which brands make Japanese capacitors?
Names you’ll see in reviews include Nichicon, Rubycon and Nippon Chemi-Con.
Sources
- Corsair: RMx series update (September 2024)
- KitGuru: Corsair SF850 Platinum (2024) review
- HWBusters: who really makes your power supply? (October 2026)
- KitGuru: Corsair RM850x ATX 3.1 review
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