XPG Core Reactor II 850W
Expert rating8.2 / 10
- Wattage:
- 850 W
- 80 PLUS Rating:
- Gold
- Modularity:
- Fully Modular
- ATX Standard:
- ATX 3.1
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Manufacturer: XPG Last updated: 2026-09-12
XPG Core Reactor II 850W (850W/80+ Gold/ATX/Fully Modular/ATX 3.1) Review
If you're searching for the XPG Core Reactor II 850W, or just looking for a solid 850W 80 PLUS Gold PSU in a ATX form factor, here's the full rundown on specs, price, and how it stacks up.
Short answer: the Core Reactor II 850W is a fully modular 850W unit built to the ATX 3.1 spec, and we'd recommend it if you want Gold-tier efficiency at this wattage without chasing a flagship price tag.
Efficiency and Build Quality
The Core Reactor II 850W carries an 80 PLUS Gold certification and Cybenetics Gold efficiency / A noise, built on a CWT platform. Its 135mm FDB, near-silent 0dB mode keeps noise down, with Zero-RPM fan-stop under light loads.
Connectors and Cabling
You get 1x 24-pin ATX, 1x EPS 4+4, 1x 12V-2x6 (600W), 4x PCIe 6+2-pin, 8x SATA, 3x Molex. Cable lengths run 24-pin 600mm, EPS 650mm, 12V-2x6 600mm, PCIe 650mm, SATA 750mm, and the cables are standard black ribbon/flat, not sleeved. It's rated for a 17ms hold-up time and backed by OCP, OVP, OPP, SCP, OTP, UVP protection circuitry.
Comparison to Alternatives
Compared to the MSI MPG A850G PCIE5, the Core Reactor II 850W lands in the same efficiency tier at a different capacity, so the choice mostly comes down to how much wattage headroom you actually need. It's also worth cross-shopping against the Corsair RM850x if you're weighing Gold-tier options in this wattage class; both land in a similar price bracket, so the deciding factor usually comes down to form factor, cable sleeving, and warranty length.
Specifications
Identity
| Brand | XPG |
|---|---|
| Model Number | Core Reactor II 850W |
Output and rails
| Single +12V Rail | Yes |
|---|
Standards and compliance
| Hold-Up Time | 17 ms |
|---|
Form factor and fit
| Length | 150 mm |
|---|---|
| Colour | Black |
Build quality
| MTBF | 100000 hours |
|---|
Cables
| Modularity | Fully Modular |
|---|
Monitoring, protection and price
| Protections | OCP, OVP, OPP, SCP, OTP, UVP |
|---|---|
| Price | 139.99 USD |
| Warranty | 10 years |
| Wattage | 850 W |
|---|---|
| 80 PLUS Rating | Gold |
| ATX Standard | ATX 3.1 |
| Form Factor | ATX |
| Cybenetics Efficiency | Gold |
| Cybenetics Noise | A |
| 12V-2x6 Connectors | 1 |
| Zero-RPM Mode | Yes |
| Sleeved Cables | No |
| PCIe 8-pin Connectors | 4 |
| Connector Count | 1x 24-pin ATX, 1x EPS 4+4, 1x 12V-2x6 (600W), 4x PCIe 6+2-pin, 8x SATA, 3x Molex |
| Fan Size | 135 mm |
| Fan Model / Bearing | 135mm FDB, near-silent 0dB mode |
| OEM / Platform | CWT |
| Japanese Capacitors | Yes |
| Cable Lengths | 24-pin 600mm, EPS 650mm, 12V-2x6 600mm, PCIe 650mm, SATA 750mm |
Expert Review
Reviewed by Burooj Alam. Rated by us, not by users.
Expert rating8.2 / 10
Core Reactor II is the first ATX 3.1-certified unit in this batch, so it carries the tightened 12V-2x6 transient spec, a meaningful reassurance for anyone running a power-hungry RTX 50-series card.
Best for
- High-end single-GPU gaming builds (RTX 4080/4090-class cards)
- Builders who want Gold-tier efficiency with future GPU upgrade headroom
- Systems that benefit from a native 12V-2x6 cable
Not for
- Budget builds where a 550-650W unit would be sufficient
- Extreme dual-GPU or workstation rigs needing 1200W+
- Buyers who specifically need SFX/SFX-L sizing
FAQs
What are the key specifications of the XPG Core Reactor II 850W (850W/80+ Gold/ATX/Fully Modular/ATX 3.1)?
The XPG Core Reactor II 850W (850W/80+ Gold/ATX/Fully Modular/ATX 3.1) is a power supply from XPG. Key specs: Wattage 850 W, 80 PLUS Rating Gold, Cybenetics Efficiency Gold, Cybenetics Noise A, Modularity Fully Modular.
Will the XPG Core Reactor II 850W (850W/80+ Gold/ATX/Fully Modular/ATX 3.1) work with my current setup?
The XPG Core Reactor II 850W (850W/80+ Gold/ATX/Fully Modular/ATX 3.1) lists Wattage is 850 W. Check that against the hardware you already own before buying, since this is the field that most often decides whether a part fits.
Who is the XPG Core Reactor II 850W (850W/80+ Gold/ATX/Fully Modular/ATX 3.1) best suited to?
It suits high-end single-gpu gaming builds (rtx 4080/4090-class cards), builders who want gold-tier efficiency with future gpu upgrade headroom, systems that benefit from a native 12v-2x6 cable.
What are the drawbacks of the XPG Core Reactor II 850W (850W/80+ Gold/ATX/Fully Modular/ATX 3.1)?
It is a poor fit for budget builds where a 550-650w unit would be sufficient, extreme dual-gpu or workstation rigs needing 1200w+, buyers who specifically need sfx/sfx-l sizing.
Compare and read more
- be quiet! Pure Power 12 550W (550W/80+ Gold/Semi-Modular/ATX 2.x/Mainstream Value Pick) vs XPG Core Reactor II 850W (850W/80+ Gold/ATX/Fully Modular/ATX 3.1)
- ASUS TUF Gaming 750W Bronze (750W/80+ Bronze/Semi-Modular/ATX 2.x/Mainstream Gaming Tier) vs XPG Core Reactor II 850W (850W/80+ Gold/ATX/Fully Modular/ATX 3.1)
- ASUS ROG Strix 1000W Gold ATX3.0 (1000W/80+ Gold/ATX/Fully Modular/ATX 3.0) vs XPG Core Reactor II 850W (850W/80+ Gold/ATX/Fully Modular/ATX 3.1)
- Antec HCG1000 Gold Extreme (1000W/80+ Gold/ATX 3.0/High-End/Multi-Gpu Tier) vs XPG Core Reactor II 850W (850W/80+ Gold/ATX/Fully Modular/ATX 3.1)
- ASUS ROG Strix 850W Gold ATX3.0 (850W/80+ Gold/ATX 3.0/Popular High-End Gaming Tier) vs XPG Core Reactor II 850W (850W/80+ Gold/ATX/Fully Modular/ATX 3.1)