The darkFlash UPMOST 1250W is a PSU that you won’t find in other markets but the Asian ones, but since it uses a platform by a Zhong Yuan Power, a promising OEM, we might see this platform under a different brand name, in the US and EU markets. This is why I decided to proceed with this review, to show you something different.
The darkFlash UPMOST 1250W is (or will be) included in my best ATX v3.x & PCIe 5.x PSU picks article.
darkFlash is a brand that offers a wide range of IT products, from PSUs and cooling solutions to gaming chairs, monitors, and various PC accessories. It is a relatively new brand, having been founded in 2016. According to the information on its page, it was started by DIY PC builders and gaming enthusiasts. Its Research and Development is in Taiwan, the center of technology in today’s IT world, and the company also has branches in Korea and China.
The UPMOST 1250W is an ATX v3.0 unit with enough power to support power-hungry GPUs and CPUs. It uses a fully modular cable design, and its price is decent in the Korean market, at around 155 dollars (or 140 euros).
High-capacity ATX v3.1 PSU Reviews:
- Cooler Master GX III 1250W ATX v3.0 PSU Review
- MSI MAG A1250GL PCIE5 ATX v3.1 PSU Review
- Seasonic Prime TX-1300 ATX v3.0 PSU Review
- XPG Cybercore II 1300 Platinum PSU Review
- Cooler Master X Silent MAX Platinum 1300W: The Power Of Silence!
- Thermaltake Toughpower GF3 1350W ATX v3.0 PSU Review
- NZXT C1500 ATX v3.1 PSU Review
- Super Flower Leadex Titanium ATX v3.0 1600W PSU Review
- be quiet! Dark Power Pro 13 1600W PSU Review
- XPG Fusion 1600W Titanium PSU Review – Should Corsair Worry?
- Seasonic Prime PX-1600 ATX v3.0 PSU Review
- Seasonic Prime TX-1600 ATX v3.0 PSU Review
- Thermaltake Toughpower GF3 1650W ATX v3.0 PSU Review
- Manufacturer (OEM): Zhong Yuan Power
- Max Power: 1250W
- Cybenetics Efficiency**: [115V] Cybenetics Platinum (89-91%), [230V] Cybenetics Platinum (91-93%)
- Noise**: [115V] Cybenetics A (20-25 dB[A]) [230V] Cybenetics A- (25-30 dB[A])
- Compliance: ATX v3.0, EPS 2.92
- Operating Temperature (Continuous Full Load): 0 – 50 °C
- Alternative Low Power Mode support: Yes
- Power 12V combined: 1250W
- Number of 12V rails: 1
- Power 5V + 3.3v: 100W
- Power 5VSB: 12.5W
- Cooling: 120mm Fluid Dynamic Bearing Fan (HA1225M12F-Z)
- Semi-Passive Operation: ✓ (Selectable)
- Modular Design: Yes (Fully)
- High Power Connectors: 2x EPS (2x cables), 4x PCIe 6+2 pin (2x cables), 1x PCIe 12+4 pin (300W)
- Peripheral Connectors: 8x SATA (3x cables), 4x 4-pin Molex (2x cables)
- ATX Cable Length: 600mm
- EPS Cable Length: 700+150mm
- 12+4 pin PCIe Cable Length: 700mm
- 6+2 pin PCIe Cable Length: 700mm
- Distance between SATA / 4-pin Molex: 150mm
- In-cable capacitors: No
- Dimensions (W x H x D): 150 mm x 85 mm x 140mm
- Weight: 1.5 kg (3.31 lb)
- Warranty: 10-years
- MSRP (excluding VAT): $155
** This unit is not certified by Cybenetics. These ratings depict what it would achieve IF it was certified by this certification agency.
Power Specifications
| Rail | 3.3V | 5V | 12V | 5VSB | -12V | |
| Max. Power | Amps | 20 | 20 | 104.2 | 2.5 | 0.3 |
| Watts | 100 | 1250 | 12.5 | 3.6 | ||
| Total Max. Power (W) | 1250 | |||||
Is it just me or could the PSU have performed significantly better in ripple suppression and transient response if they hadn’t gone with such an extremely low amount of secondary caps on the secondary side?
I count 27 caps or which many are fairly small. Other manufacturers like Seasonic are liable to use over 50 caps in that power class.
Yes the form factor is small but they definitely had space for more caps on the breakout board. They cheaped out, which is a pity.
Aris would you review Antec SF850X & Gamemax GX-1050 PRO ?
if they send them to me sure 🙂
UPMOST? XD
It’s nice to see that there is so much optimism and imagination around.
This should lead to improvement.